4ebooks.org

4ebooks.org is SSL secured

Free website and domain report on 4ebooks.org

Last Updated: 4th October, 2023 Update Now
Overview

Snoop Summary for 4ebooks.org

This is a free and comprehensive report about 4ebooks.org. The domain 4ebooks.org is currently hosted on a server located in United States with the IP address 172.67.211.198, where the local currency is USD and English is the local language. Our records indicate that 4ebooks.org is privately registered by Privacy service provided by Withheld for Privacy ehf. If 4ebooks.org was to be sold it would possibly be worth $630 USD (based on the daily revenue potential of the website over a 24 month period). 4ebooks.org receives an estimated 298 unique visitors every day - a decent amount of traffic! This report was last updated 4th October, 2023.

About 4ebooks.org

Site Preview: 4ebooks.org 4ebooks.org
Title: 4 eBooks
Description:
Keywords and Tags: hardware, software
Related Terms:
Fav Icon:
Age: Over 16 years old
Domain Created: 26th April, 2008
Domain Updated: 29th November, 2020
Domain Expires: 26th April, 2022
Review

Snoop Score

2/5

Valuation

$630 USD
Note: All valuation figures are estimates.

Popularity

Low
Note: Popularity is estimated.

Rank, Reach and Authority

Alexa Rank: 4,677,840
Alexa Reach:
SEMrush Rank (US):
SEMrush Authority Score:
Moz Domain Authority: 0
Moz Page Authority: 0

Organic vs Paid (Google Ads)

Traffic

Visitors

Daily Visitors: 298
Monthly Visitors: 9,070
Yearly Visitors: 108,770
Note: All visitors figures are estimates.

Visitors By Country

Revenue

Revenue

Daily Revenue: $1 USD
Monthly Revenue: $26 USD
Yearly Revenue: $310 USD
Note: All revenue figures are estimates.

Revenue By Country

SEO

Backlinks Analysis (SEMrush)

Top New Follow Links

Top Ranking Keywords (US)

Domain Analysis

Value Length
Domain: 4ebooks.org 11
Domain Name: 4ebooks 7
Extension (TLD): org 3
Expiry Check:

Page Speed Analysis

Average Load Time: 1.91 seconds
Load Time Comparison: Faster than 31% of sites

PageSpeed Insights

Avg. (All Categories) 77
Performance 100
Accessibility 97
Best Practices 87
SEO 83
Progressive Web App 18
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
Simulate loading on desktop
100

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for 4ebooks.org. This includes details about optimizing page load times which can result in a better user experience.

Metrics

First Contentful Paint — 0.7 s
The time taken for the first image or text on the page to be rendered.
Speed Index — 0.7 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 0.7 s
The timing of the largest text or image that is painted.
Time to Interactive — 0.7 s
The time taken for the page to become fully interactive.
Total Blocking Time — 0 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).
Cumulative Layout Shift — 0.003
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Other

Max Potential First Input Delay — 20 ms
Users could experience a delay when interacting with the page.
First Meaningful Paint — 0.7 s
The time taken for the primary content of the page to be rendered.
Network Requests
Below is a list of network requests that were made during page load.
URL Protocol Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://4ebooks.org/
http/1.1
0
373.80499951541
5999
12969
200
text/html
Document
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
http/1.1
386.49499975145
519.31099966168
28152
184773
200
text/css
Stylesheet
https://fonts.googleapis.com/css?family=Courgette%7COpen+Sans%3A300%2C300i%2C400%2C400i%2C600%2C600i%2C700%2C700i%2C800%2C800i&ver=5.2.11
h2
386.7429997772
405.73799982667
1904
21880
200
text/css
Stylesheet
http://4ebooks.org/wp-content/uploads/2019/08/cash.jpg
http/1.1
407.35199954361
508.1129996106
62618
61963
200
image/jpeg
Image
http://4ebooks.org/wp-content/cache/autoptimize/js/autoptimize_7895be25794321c1ca9d480739abcf1a.js
http/1.1
511.88699994236
644.96099948883
33033
114412
200
application/javascript
Script
https://fonts.gstatic.com/s/opensans/v20/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2
h2
601.30199976265
606.31900001317
9917
9196
200
font/woff2
Font
https://fonts.gstatic.com/s/courgette/v8/wEO_EBrAnc9BLjLQAUk1VvoK_kgXiQ.woff2
h2
601.52100026608
606.71500023454
19066
18308
200
font/woff2
Font
https://fonts.gstatic.com/s/opensans/v20/mem5YaGs126MiZpBA-UN7rgOUuhpKKSTjw.woff2
h2
602.83999983221
605.76099995524
9885
9128
200
font/woff2
Font
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
383.373
7.323
528.565
8.45
537.082
60.565
597.662
36.146
642.375
7.459
660.477
18.719
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Opportunities

Properly size images
Images can slow down the page's load time. 4ebooks.org should consider serving more appropriate-sized images.
Defer offscreen images
Time to Interactive can be slowed down by resources on the page. 4ebooks.org should consider lazy-loading offscreen and hidden images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. 4ebooks.org should consider minifying CSS files.
Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. 4ebooks.org should consider minifying JS files.
Reduce unused CSS — Potential savings of 26 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. 4ebooks.org should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
28152
27021
Reduce unused JavaScript — Potential savings of 24 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
http://4ebooks.org/wp-content/cache/autoptimize/js/autoptimize_7895be25794321c1ca9d480739abcf1a.js
33033
24851
Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.
Serve images in next-gen formats
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 370 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
http://4ebooks.org/
374.802
Avoid multiple page redirects
Redirects can cause additional delays before the page can begin loading. 4ebooks.org should avoid multiple or unnecessary page redirects.
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. 4ebooks.org should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.
URL Potential Savings (Ms)
http://4ebooks.org/wp-content/uploads/2019/08/cash.jpg
0

Diagnostics

Avoids enormous network payloads — Total size was 167 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
http://4ebooks.org/wp-content/uploads/2019/08/cash.jpg
62618
http://4ebooks.org/wp-content/cache/autoptimize/js/autoptimize_7895be25794321c1ca9d480739abcf1a.js
33033
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
28152
https://fonts.gstatic.com/s/courgette/v8/wEO_EBrAnc9BLjLQAUk1VvoK_kgXiQ.woff2
19066
https://fonts.gstatic.com/s/opensans/v20/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2
9917
https://fonts.gstatic.com/s/opensans/v20/mem5YaGs126MiZpBA-UN7rgOUuhpKKSTjw.woff2
9885
http://4ebooks.org/
5999
https://fonts.googleapis.com/css?family=Courgette%7COpen+Sans%3A300%2C300i%2C400%2C400i%2C600%2C600i%2C700%2C700i%2C800%2C800i&ver=5.2.11
1904
Avoids an excessive DOM size — 76 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
76
Maximum DOM Depth
14
Maximum Child Elements
16
Avoid chaining critical requests — 4 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. 4ebooks.org should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
JavaScript execution time — 0.1 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
http://4ebooks.org/
115.322
60.118
1.585
Minimizes main-thread work — 0.2 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
77.523
Style & Layout
38.877
Other
27.203
Parse HTML & CSS
12.098
Script Parsing & Compilation
4.179
Rendering
3.851
Keep request counts low and transfer sizes small — 8 requests • 167 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
8
170574
Image
1
62618
Font
3
38868
Script
1
33033
Stylesheet
2
30056
Document
1
5999
Media
0
0
Other
0
0
Third-party
4
40772
Minimize third-party usage — Third-party code blocked the main thread for 0 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
40772
0
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Avoid large layout shifts — 2 elements found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
0.0014697487085194
0.0012748772728599
Uses passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks — 1 long task found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
http://4ebooks.org/
420
61
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Image elements have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Opportunities

Eliminate render-blocking resources — Potential savings of 480 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. 4ebooks.org should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
28152
110
https://fonts.googleapis.com/css?family=Courgette%7COpen+Sans%3A300%2C300i%2C400%2C400i%2C600%2C600i%2C700%2C700i%2C800%2C800i&ver=5.2.11
1904
230

Diagnostics

Serve static assets with an efficient cache policy — 1 resource found
4ebooks.org can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
http://4ebooks.org/wp-content/uploads/2019/08/cash.jpg
14400000
62618

Diagnostics

Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://fonts.gstatic.com/s/opensans/v20/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2
5.0170002505183
https://fonts.gstatic.com/s/courgette/v8/wEO_EBrAnc9BLjLQAUk1VvoK_kgXiQ.woff2
5.1939999684691
https://fonts.gstatic.com/s/opensans/v20/mem5YaGs126MiZpBA-UN7rgOUuhpKKSTjw.woff2
2.921000123024
97

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of 4ebooks.org. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
4ebooks.org may provide assistance to deaf or hearing-impaired users with captions on videos.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
87

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that 4ebooks.org should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Links to cross-origin destinations are safe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
jQuery
3.2.1
WordPress
5.2.11
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
No browser errors logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 4 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://4ebooks.org/
Allowed
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
Allowed
http://4ebooks.org/wp-content/uploads/2019/08/cash.jpg
Allowed
http://4ebooks.org/wp-content/cache/autoptimize/js/autoptimize_7895be25794321c1ca9d480739abcf1a.js
Allowed
Includes front-end JavaScript libraries with known security vulnerabilities — 3 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Library Version Vulnerability Count Highest Severity
3
Medium
83

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for 4ebooks.org. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of 4ebooks.org on mobile screens.
Document uses legible font sizes
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Tap targets are sized appropriately
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Document does not have a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Links do not have descriptive text — 1 link found
Make use of descriptive link text to assist search engines in understanding the content.

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
18

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of 4ebooks.org. This includes details about web app manifests.

PWA Optimized

Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of 4ebooks.org on mobile screens.

Installable

Web app manifest or service worker do not meet the installability requirements — 1 reason
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
Failure reason
No manifest was fetched

PWA Optimized

Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Does not redirect HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Avg. (All Categories) 78
Performance 95
Accessibility 97
Best Practices 87
SEO 86
Progressive Web App 25
0–49 (Fail) 50–89 (Average) 90–100 (Pass)
Simulate loading on mobile
95

Performance

Indicates how well the page is performing and highlights opportunities where performance may be improved for 4ebooks.org. This includes details about optimizing page load times which can result in a better user experience.

Metrics

Speed Index — 2.3 s
The time taken for the page contents to be visibly populated.
Largest Contentful Paint — 2.5 s
The timing of the largest text or image that is painted.
Time to Interactive — 2.3 s
The time taken for the page to become fully interactive.
Total Blocking Time — 0 ms
The total blocking time is the sum of all time periods between First Contentful Paint and Time to Interactive (when task length exceeded 50ms).
Cumulative Layout Shift — 0.001
Cumulative Layout Shift is the measurement of visible elements collective movement within the viewport.
View Data

Other

Max Potential First Input Delay — 30 ms
Users could experience a delay when interacting with the page.
First Meaningful Paint — 2.3 s
The time taken for the primary content of the page to be rendered.
Network Requests
Below is a list of network requests that were made during page load.
URL Protocol Start Time (Ms) End Time (Ms) Transfer Size (Bytes) Resource Size (Bytes) Status Code MIME Type Resource Type
http://4ebooks.org/
http/1.1
0
359.31100000016
6024
12969
200
text/html
Document
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
http/1.1
374.94000000152
451.80300000357
28164
184773
200
text/css
Stylesheet
https://fonts.googleapis.com/css?family=Courgette%7COpen+Sans%3A300%2C300i%2C400%2C400i%2C600%2C600i%2C700%2C700i%2C800%2C800i&ver=5.2.11
h2
375.16600000527
383.59599999967
1904
21880
200
text/css
Stylesheet
http://4ebooks.org/wp-content/uploads/2019/08/cash.jpg
http/1.1
385.31800000055
469.7060000035
62616
61963
200
image/jpeg
Image
http://4ebooks.org/wp-content/cache/autoptimize/js/autoptimize_7895be25794321c1ca9d480739abcf1a.js
http/1.1
454.13600000029
567.7050000013
33037
114412
200
application/javascript
Script
data
528.07400000165
528.15600000031
0
192
200
image/svg+xml
Image
https://fonts.gstatic.com/s/opensans/v20/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2
h2
530.46300000278
533.76000000571
9951
9196
200
font/woff2
Font
https://fonts.gstatic.com/s/courgette/v8/wEO_EBrAnc9BLjLQAUk1VvoK_kgXiQ.woff2
h2
530.64599999925
534.37900000426
19066
18308
200
font/woff2
Font
https://fonts.gstatic.com/s/opensans/v20/mem5YaGs126MiZpBA-UN7rgOUuhpKKSTjw.woff2
h2
530.98800000589
534.75099999923
9885
9128
200
font/woff2
Font
Network Round Trip Times — 0 ms
High Network RTT (Round Trip Times) can have a large impact on performance. Providing servers geographically closer to the user could improve performance.
Server Backend Latencies — 0 ms
High server latencies indicate the server is overloaded or has a poor backend performance.
Tasks
Below is a list of the top-level main thread tasks that executed during page load.
Start Time (Ms) End Time (Ms)
372.252
8.755
462.633
8.648
471.388
59.022
530.424
27.432
565.881
7.595
584.836
19.389
Diagnostics
Below is a collection of useful page vitals.
View Data
Metrics
Below is a collection of metrics.
View Data
Script Treemap Data
Provide as required, for treemap app.

Opportunities

Properly size images
Images can slow down the page's load time. 4ebooks.org should consider serving more appropriate-sized images.
Defer offscreen images
Time to Interactive can be slowed down by resources on the page. 4ebooks.org should consider lazy-loading offscreen and hidden images.
Minify CSS
Cascading Style Sheets (CSS) files can contribute to network payload sizes. 4ebooks.org should consider minifying CSS files.
Minify JavaScript
JavaScript (JS) files can contribute to network payload sizes and increase script parse times. 4ebooks.org should consider minifying JS files.
Reduce unused CSS — Potential savings of 26 KiB
Dead and/or unused rules in Style Sheets (CSS) can contribute to network payload sizes. 4ebooks.org should consider removing dead rules from style sheets and deferring the loading of CSS not used for above-the-fold content.
URL Transfer Size (Bytes) Potential Savings (Bytes)
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
28164
27071
Reduce unused JavaScript — Potential savings of 24 KiB
It is advised to remove unused JavaScript in order to reduce bytes consumed by network activity.
URL Transfer Size (Bytes) Potential Savings (Bytes)
http://4ebooks.org/wp-content/cache/autoptimize/js/autoptimize_7895be25794321c1ca9d480739abcf1a.js
33037
24854
Efficiently encode images
Unoptimized images can consume more cellular data than what is necessary.
Serve images in next-gen formats
Consider JPEG 2000, JPEG XR or WebP image formats which provide better compression than PNG and JPEG.
Enable text compression
Text-based resources should be served with compression, such as gzip, deflate or brotli.
Preconnect to required origins
Resource hints, such as 'preconnect' or 'dns-prefetch', may assist in establishing early connections to important third-party origins.
Initial server response time was short — Root document took 360 ms
It is advised to keep the server response time short for the main document, because all other requests depend on it.
URL Time Spent (Ms)
http://4ebooks.org/
360.307
Avoid multiple page redirects
Redirects can cause additional delays before the page can begin loading. 4ebooks.org should avoid multiple or unnecessary page redirects.
Preload key requests
Key requests can be preloaded by using '<link rel=preload>'. 4ebooks.org should consider using '<link rel=preload>' to prioritize fetching resources that are currently requested later in page load.
Use video formats for animated content
Large GIFs are inefficient for delivering animated content. It is recommended to use MPEG4/WebM videos for animations and PNG/WebP for static images instead of GIF.
Remove duplicate modules in JavaScript bundles
Ensure that no duplicate JavaScript modules from bundles exist to reduce bytes consumed by network activity.
Avoid serving legacy JavaScript to modern browsers
Polyfills and transforms enable legacy browsers to use new JavaScript features. For bundled JavaScript it is recommended to adopt a modern script deployment strategy using module/nomodule feature detection. This will reduce the amount of code shipped to modern browsers.
Preload Largest Contentful Paint image
It is recommended to preload images used by LCP elements, to improve LCP time.

Diagnostics

Avoids enormous network payloads — Total size was 167 KiB
Large network payloads can cost users money and are linked to long load times.
URL Transfer Size (Bytes)
http://4ebooks.org/wp-content/uploads/2019/08/cash.jpg
62616
http://4ebooks.org/wp-content/cache/autoptimize/js/autoptimize_7895be25794321c1ca9d480739abcf1a.js
33037
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
28164
https://fonts.gstatic.com/s/courgette/v8/wEO_EBrAnc9BLjLQAUk1VvoK_kgXiQ.woff2
19066
https://fonts.gstatic.com/s/opensans/v20/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2
9951
https://fonts.gstatic.com/s/opensans/v20/mem5YaGs126MiZpBA-UN7rgOUuhpKKSTjw.woff2
9885
http://4ebooks.org/
6024
https://fonts.googleapis.com/css?family=Courgette%7COpen+Sans%3A300%2C300i%2C400%2C400i%2C600%2C600i%2C700%2C700i%2C800%2C800i&ver=5.2.11
1904
Avoids an excessive DOM size — 76 elements
A large DOM (Document Object Model) will increase memory usage, cause longer system calculations as well as costly layout reflows.
Statistic Element Value
Total DOM Elements
76
Maximum DOM Depth
14
Maximum Child Elements
16
Avoid chaining critical requests — 4 chains found
Below is a list of Critical Request Chains, which shows which resources are loaded with a high priority. 4ebooks.org should consider reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.
User Timing marks and measures
Make use of the User Timing API to measure an app's real-world performance during key user experiences.
JavaScript execution time — 0.3 s
JavaScript (JS) execution time can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
URL Total CPU Time (Ms) Script Evaluation (Ms) Script Parse (Ms)
http://4ebooks.org/
431.62
234.396
6.604
Unattributable
77.996
12.784
1.252
http://4ebooks.org/wp-content/cache/autoptimize/js/autoptimize_7895be25794321c1ca9d480739abcf1a.js
76.98
57.54
10.844
Minimizes main-thread work — 0.6 s
Main-thread work timing can be lowered by reducing the time required for parsing, compiling and executing JS. Delivering smaller JS payloads may help with this.
Category Time Spent (Ms)
Script Evaluation
304.72
Style & Layout
119.824
Other
112.04
Parse HTML & CSS
47.424
Script Parsing & Compilation
18.7
Rendering
18.48
Keep request counts low and transfer sizes small — 8 requests • 167 KiB
It is advised to add a budgets.json file in order to set budgets for the quantity and size of page resources.
Resource Type Requests Transfer Size (Bytes)
Total
8
170647
Image
1
62616
Font
3
38902
Script
1
33037
Stylesheet
2
30068
Document
1
6024
Media
0
0
Other
0
0
Third-party
4
40806
Minimize third-party usage — Third-party code blocked the main thread for 0 ms
It is advised to either limit, remove or delay the loading of redundant third-party code which may be significantly impacting load performance.
Third-Party Transfer Size (Bytes) Main-Thread Blocking Time (Ms)
40806
0
Lazy load third-party resources with facades
Consider replacing third-party embeds with a facade until they are required (use lazy loading).
Largest Contentful Paint element — 1 element found
The element which was identified as the Largest Contentful Paint.
Element
Avoid large layout shifts — 1 element found
Below is a list of all DOM elements that contribute to the CLS of the page.
Element CLS Contribution
0.00072209358215332
Uses passive listeners to improve scrolling performance
Improve the page's scroll performance by marking touch and wheel event listeners as 'passive'.
Avoids `document.write()`
Avoid or limit the use of external scripts that are dynamically injected via 'document.write()' as users on slow connections will be delayed by tens of seconds.
Avoid long main-thread tasks — 2 long tasks found
Below is a list of the longest tasks on the main thread, which is useful when identifying the worst input delay contributors.
URL Start Time (Ms) Duration (Ms)
http://4ebooks.org/
1410
236
http://4ebooks.org/
638
55
Avoid non-composited animations
It is recommended to avoid non-composited animations which are often janky and increase CLS.
Image elements have explicit `width` and `height`
Reduce layout shifts and improve CLS by setting explicit width and height properties on image elements.

Budgets

Performance budget
It is advised to keep the quantity and size of all network requests under the targets set by the provided performance budget.
Timing budget
It is advised to set a timing budget to monitor the performance of your site.

Metrics

First Contentful Paint — 2.3 s
The time taken for the first image or text on the page to be rendered.

Diagnostics

Serve static assets with an efficient cache policy — 1 resource found
4ebooks.org can speed up repeat visits by increasing the cache lifetime, which is essentially how long before a cached copy expires.
URL Cache TTL (Ms) Transfer Size (Bytes)
http://4ebooks.org/wp-content/uploads/2019/08/cash.jpg
14400000
62616

Opportunities

Eliminate render-blocking resources — Potential savings of 1,650 ms
Resources, such as JavaScript and style sheets, can block the first paint of the page. 4ebooks.org should consider delivering critical JavaScript/style sheets (JS/CSS) inline and deferring all non-critical JS/CSS.
URL Transfer Size (Bytes) Potential Savings (Ms)
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
28164
480
https://fonts.googleapis.com/css?family=Courgette%7COpen+Sans%3A300%2C300i%2C400%2C400i%2C600%2C600i%2C700%2C700i%2C800%2C800i&ver=5.2.11
1904
780

Diagnostics

Ensure text remains visible during webfont load
Make use of the font-display CSS feature, which will ensure text is user-visible while webfonts are loading.
URL Potential Savings (Ms)
https://fonts.gstatic.com/s/opensans/v20/mem8YaGs126MiZpBA-UFVZ0bf8pkAg.woff2
3.2970000029309
https://fonts.gstatic.com/s/courgette/v8/wEO_EBrAnc9BLjLQAUk1VvoK_kgXiQ.woff2
3.7330000050133
https://fonts.gstatic.com/s/opensans/v20/mem5YaGs126MiZpBA-UN7rgOUuhpKKSTjw.woff2
3.7629999933415

Other

First Contentful Paint (3G) — 4590 ms
The time taken for the first image or text on the page to be rendered while on a 3G network.
97

Accessibility

Indicates how accessible the page is and highlights opportunities where the page can be made more accessible to users of 4ebooks.org. This includes details about various page attributes that can be optimized.

Navigation

`[accesskey]` values are unique
Access keys assist users with focusing on different parts of the page. Each access key should be unique for proper navigation.
The page contains a heading, skip link, or landmark region
It is advised to provide ways to bypass repetitive content, allowing users to navigate the page efficiently.
`[id]` attributes on active, focusable elements are unique
Ensure all focusable elements have a unique id value to allow them to be visible to users of assistive technologies, like a screen reader.
Heading elements appear in a sequentially-descending order
Properly order all headers and do not skip heading levels to better the navigation and readability for users of assistive technologies, like a screen reader.
No element has a `[tabindex]` value greater than 0
Although technically valid, a tabindex value greater than 0 often creates frustrating experiences for users who rely on assistive technologies.

ARIA

`[aria-*]` attributes match their roles
Avoid mismatching 'aria-*' attributes and their 'role' value, as it invalidates the attribute.
`button`, `link`, and `menuitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-hidden="true"]` is not present on the document `<body>`
If aria-hidden=true is set on the document body, assistive technologies, like a screen reader will work inconsistently.
`[aria-hidden="true"]` elements do not contain focusable descendents
Interactive elements within an aria-hidden=true element are unavailable to users of assistive technologies, like a screen reader.
ARIA input fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when an input field does not have an accessible name specified.
ARIA `meter` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `progressbar` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[role]`s have all required `[aria-*]` attributes
Some ARIA roles have required 'aria-*' attributes, which provide essential information about state and functionality.
Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.
Some ARIA parent roles cannot perform their intended functions if specific child roles are not used.
`[role]`s are contained by their required parent element
Some ARIA child roles cannot perform their intended functions if specific parent roles are not used.
`[role]` values are valid
All ARIA roles require valid values to perform their intended functions.
ARIA toggle fields have accessible names
Generic names are announced to users of assistive technologies, like a screen reader, when a toggle field does not have an accessible name specified.
ARIA `tooltip` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
ARIA `treeitem` elements have accessible names
Without accessible names on elements, screen readers will default to announcing a generic name, which means your content will be less accessible to users who rely on screen readers.
`[aria-*]` attributes have valid values
ARIA attributes cannot be interpreted with invalid values when used by screen readers and other assistive technologies.
`[aria-*]` attributes are valid and not misspelled
ARIA attributes cannot be interpreted with invalid names when used by screen readers and other assistive technologies.
ARIA IDs are unique
Ensure all ARIA ID values are unique to prevent elements from being overlooked by assistive technologies, like a screen reader.

Names and labels

Buttons have an accessible name
Buttons become unusable as they are announced simply as "button" when the button does not have an accessible name, when used by screen readers and other assistive technologies.
Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
No form fields have multiple labels
Having multiple labels for form fields can be confusing to assistive technologies, like a screen reader.
`<frame>` or `<iframe>` elements have a title
Screen reader users and other assistive technology users rely on frame titles to describe the contents of frames.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
`<input type="image">` elements have `[alt]` text
Input buttons with alternative text assist screen readers and other assistive technology users to understand its purpose.
Form elements have associated labels
Screen readers and other assistive technologies rely on labels to properly announce form controls.
Links have a discernible name
In order to improve the navigation for screen reader and other assistive technology users, use link text that is unique, focusable and discernible.
`<object>` elements have `[alt]` text
It is advised that alt text is used on '<object>' elements in order to provide meaning to screen reader and other assistive technology users, as these technologies are unable to translate non-text content.

Tables and lists

`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.
Screen readers and other assistive technologies may produce poor and inaccurate output when definition lists are not properly marked up.
Definition list items are wrapped in `<dl>` elements
In order for screen readers and other assistive technologies to properly announce definition list items ('<dt>' and '<dd>'), they must be wrapped in parent a '<dl>' element.
Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
Use proper list structure to aid screen readers and other assistive technologies.
List items (`<li>`) are contained within `<ul>` or `<ol>` parent elements
In order for screen readers to announce list items, ensure that list items ('<li>') are contained within parent '<ul>' or '<ol>' tags.
Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that '<td>' cells using the headers attribute only refer to other cells in the same table, to improve screen reader user experience.
`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.
Screen readers and other assistive technologies have features to make navigating tables easier. Ensure that table headers refer to some set of cells, to improve screen reader user experience.

Internationalization and localization

`<html>` element has a `[lang]` attribute
It is advised to provide a lang attribute so that screen readers and other assistive technologies are guaranteed to announce the page's text correctly. When not provided, the user's default language setting will be used which may cause inaccuracies.
`<html>` element has a valid value for its `[lang]` attribute
Specify a valid BCP 47 language in order to help screen readers and other assistive technologies announce text properly.
`[lang]` attributes have a valid value
Specify a valid BCP 47 language on elements in order to help screen readers and other assistive technologies announce text properly.

Best practices

The document does not use `<meta http-equiv="refresh">`
Pages that refresh automatically cause a poor user experience as focus is directed back to the top of the page unexpectedly.
`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
For users with low vision who rely on screen magnification, ensure that zooming is not disabled.

Audio and video

`<video>` elements contain a `<track>` element with `[kind="captions"]`
4ebooks.org may provide assistance to deaf or hearing-impaired users with captions on videos.

Contrast

Background and foreground colors do not have a sufficient contrast ratio.
Many (if not most) users find low-contrast text difficult or impossible to read.
Failing Elements

Manual Checks

The page has a logical tab order
The visual layout should be logical in its tab order and users cannot focus elements that are offscreen.
Interactive controls are keyboard focusable
Ensure that custom interactive controls are keyboard focusable and that a focus indicator is displayed.
Interactive elements indicate their purpose and state
Ensure that interactive elements (such as links and buttons) are distinguishable from non-interactive elements and that they indicate their state.
The user's focus is directed to new content added to the page
When new content (such as a dialogue) is added to the page, the user's focus should be directed to it.
User focus is not accidentally trapped in a region
Avoid focus being accidentally trapped when a user tabs in and out of controls or regions on page.
Custom controls have associated labels
Ensure that custom interactive controls have associated labels, which are provided by aria-label and aria-labelledby attributes.
Custom controls have ARIA roles
Ensure that all custom interactive controls have appropriate ARIA roles.
Visual order on the page follows DOM order
Ensure that the DOM order matches with the page's visual order, in order to improve navigation for screen readers and other assistive technologies.
Offscreen content is hidden from assistive technology
Ensure that offscreen content is hidden through the use of "display:none" styling or the aria-hidden attribute.
HTML5 landmark elements are used to improve navigation
Elements such as <main> and <nav> are recommended as they are used by screen readers and other assistive technologies to improve keyboard navigation.
87

Best Practices

Indicates the recommended, best practices currently in place on the page and highlights the best practices that 4ebooks.org should incorporate. This includes practices such as protecting pages with HTTPS.

Audits

Links to cross-origin destinations are safe
Improve performance and prevent security vulnerabilities by adding rel="noopener" and rel="noreferrer" to external links.
Avoids requesting the geolocation permission on page load
When requesting a user's location, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Avoids requesting the notification permission on page load
When requesting permission to send notifications, provide context or consider tying the request to a user action to avoid confusion and mistrust from users.
Ensure CSP is effective against XSS attacks
Significantly reduce the risk of cross-site scripting attacks (XSS) by ensuring you have a strong Content Security Policy (CSP).
Description Directive Severity
No CSP found in enforcement mode
High

Audits

Allows users to paste into password fields
Ensure that password inputs may be pasted into to aid in the user's ability to use password managers and improve security.
Displays images with correct aspect ratio
Ensure that image display dimensions match their natural aspect ratio.
Serves images with appropriate resolution
For maximum image clarity, ensure images have natural dimensions and are proportional to the display size and pixel ratio.
Fonts with `font-display: optional` are preloaded
It is recommended that optional fonts are preloaded.

Audits

Page has the HTML doctype
Ensure a doctype is specified to prevent the browser from switching to quirks-mode.
Properly defines charset
It is advised to declare a character encoding, optionally via a <meta> tag in the first 1024 bytes of the HTML or in the Content-Type HTTP response header.

Audits

Avoids `unload` event listeners
The 'unload' event does not fire reliably, causing issues with browser optimizations such as the Back-Forward Cache. It is recommended that 'pagehide' or 'visibilitychange' events are used instead.
Avoids Application Cache
Application cache is deprecated and is no longer recommended.
Detected JavaScript libraries
Below is a list of all front-end JavaScript libraries that were detected on the page.
Name Version
jQuery
3.2.1
WordPress
5.2.11
Avoids deprecated APIs
Avoid deprecated APIs which will eventually be removed the browser.
No browser errors logged to the console
Below is a list of all errors logged to the console, which indicate unresolved problems on the site.
Page has valid source maps
Consider deploying source maps for added benefits such as the ability to debug while in production.
No issues in the `Issues` panel in Chrome Devtools
There may be unresolved issues logged to Chrome Devtools.

Audits

Does not use HTTPS — 4 insecure requests found
Ensure that all pages are protected with HTTPS (including those that do not handle sensitive data) as HTTPS prevents tampering and passive listening on communications between the app and its users. Additionally, HTTPS is a prerequisite for HTTP/2 and many new web platform APIs.
Insecure URL Request Resolution
http://4ebooks.org/
Allowed
http://4ebooks.org/wp-content/cache/autoptimize/css/autoptimize_caf3844e28de8edb30dad90b5730a35e.css
Allowed
http://4ebooks.org/wp-content/uploads/2019/08/cash.jpg
Allowed
http://4ebooks.org/wp-content/cache/autoptimize/js/autoptimize_7895be25794321c1ca9d480739abcf1a.js
Allowed
Includes front-end JavaScript libraries with known security vulnerabilities — 3 vulnerabilities detected
Ensure that the use of third-party scripts is minimal and that only trusted third-party scripts are used as some may contain known security vulnerabilities which may be exploited by attackers.
Library Version Vulnerability Count Highest Severity
3
Medium
86

SEO

Indicates how well the page is optimized for ranking in search engines and highlights Search Engine Optimization (SEO) opportunities for 4ebooks.org. This includes optimizations such as providing meta data.

Mobile Friendly

Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of 4ebooks.org on mobile screens.
Document uses legible font sizes — 100% legible text
Font sizes of 12px or less are too small to most mobile users without user gestures and further action. Aim for more than 60% of page text to use font sizes greater than 12px.
Source Selector % of Page Text Font Size
100.00%
≥ 12px
Tap targets are sized appropriately — 100% appropriately sized tap targets
Interactive elements (such as buttons and links) should be appropriately spaced, sized and easy enough to select or tap with regard to their surrounding elements.

Content Best Practices

Document has a `<title>` element
Search engines, screen reader users and other assistive technology users rely on the title to provide an overview of the page and to help determine if the page is relevant to their search.
Image elements have `[alt]` attributes
Provide short and descriptive alternative text where possible on informative elements.
Document has a valid `hreflang`
Search engines can be instructed to list specific versions of a page for a given language or region through the use of hreflang links.
Document has a valid `rel=canonical`
Search engines can be suggested which URL should be shown in search results through the use of canonical links.
Document avoids plugins
The content of plugins cannot be indexed by search engines and many devices either restrict or do not support them.

Crawling and Indexing

Page has successful HTTP status code
Avoid pages with unsuccessful HTTP status codes as they may not be indexed by search engines.
Links are crawlable
Ensure that the 'href' attribute of anchor elements links to the appropriate destination. This allows for more pages of the site to be discovered by search engines.
Page isn’t blocked from indexing
Pages that cannot be crawled by search engines cannot be indexed or included in their search results. Ensure that search engines have permission to crawl all pages that should be indexed.
robots.txt is valid
Malformed robots.txt files prevent crawlers from understanding how a site wants to be crawled or indexed, which can be devastating to SEO.

Content Best Practices

Document does not have a meta description
Meta descriptions may be used by search engines when displaying a link to the page and should concisely summarize the page's content.
Links do not have descriptive text — 1 link found
Make use of descriptive link text to assist search engines in understanding the content.

Manual Checks

Structured data is valid
Structured data can be validated through the use of the Structured Data Testing Tool and the Structured Data Linter.
25

Progressive Web App

Indicates how valid the aspects of a Progressive Web App (PWA) are for the page and highlights opportunities to enable/improve the PWA of 4ebooks.org. This includes details about web app manifests.

PWA Optimized

Content is sized correctly for the viewport
Ensure that the width of the app's content matches the width of the viewport, otherwise the app might not be optimized for mobile screens.
Has a `<meta name="viewport">` tag with `width` or `initial-scale`
It is advised to use a '<meta name="viewport">' tag for the optimization of 4ebooks.org on mobile screens.

Installable

Web app manifest or service worker do not meet the installability requirements — 1 reason
User engagement may be increased by leveraging the browsers ability to proactively prompt users to add the app to their homescreen.
Failure reason
No manifest was fetched

PWA Optimized

Does not register a service worker that controls page and `start_url`
A service worker is used to provide Progressive Web Apps the use of features such as working offline, the ability for the app to be added to the homescreen as well as push notifications.
Does not redirect HTTP traffic to HTTPS
It is advised to redirect all HTTP traffic to HTTPS, in order to enable secure web features for all users.
Is not configured for a custom splash screen
Themed splash screens ensure a high-quality user experience at launch for app users.
View Data
Does not set a theme color for the address bar.
A theme may be applied to the browser address bar, which ideally can be made to match the site.
View Data
Does not provide a valid `apple-touch-icon`
iOS users of Progressive Web Apps will benefit from an apple touch icon, which can be defined with 'apple-touch-icon', which must point to a non-transparent 192px (or 180px) square PNG.
Manifest doesn't have a maskable icon
Maskable icons are great to ensure that images fill the entire shape when installing the app on a device.

Manual Checks

Site works cross-browser
Ensure that the Progressive Web App works correctly across every major browser.
Page transitions don't feel like they block on the network
Users perceive apps with responsive, snappy transitions as higher peforming and ensures a great user experience, even on a slow network.
Each page has a URL
Ensure that all pages are deep linkable via URL. They should also be unique for the purpose of shareability on social media.
Hosting

Server Location

Server IP Address: 172.67.211.198
Continent: North America
Country: United States
United States Flag
Region:
City:
Longitude: -97.822
Latitude: 37.751
Currencies: USD
USN
USS
Languages: English

Web Hosting Provider

Name IP Address
Cloudflare, Inc.
Registration

Domain Registrant

Private Registration: Yes
Name:
Organization: Privacy service provided by Withheld for Privacy ehf
Country: IS
City:
State: Capital Region
Post Code:
Email:
Phone:
Note: Registration information is derived from various sources and may be inaccurate.

Domain Registrar

Name IP Address
NAMECHEAP INC 104.16.100.56
Security

Visitor Safety

Mature Content: Not Likely
McAfee WebAdvisor Rating: Unknown
WOT Rating:
WOT Trustworthiness: 68/100
WOT Child Safety: 74/100
Note: Safety information is not guaranteed.

SSL/TLS Certificate

Issued To: sni.cloudflaressl.com
Issued By: Cloudflare Inc ECC CA-3
Valid From: 10th May, 2021
Valid To: 9th May, 2022
Subject: CN = sni.cloudflaressl.com
O = Cloudflare, Inc.
L = San Francisco
S = US
Hash: c959965e
Issuer: CN = Cloudflare Inc ECC CA-3
O = Cloudflare, Inc.
S = US
Version: 2
Serial Number: 1901675807653591977016250189115060371
Serial Number (Hex): 016E3FDB2F5C2BFE16507EF08AC07093
Valid From: 10th May, 2024
Valid To: 9th May, 2024
Signature Algorithm (Short Name): ecdsa-with-SHA256
Signature Algorithm (Long Name): ecdsa-with-SHA256
Authority Key Identifier: keyid:A5:CE:37:EA:EB:B0:75:0E:94:67:88:B4:45:FA:D9:24:10:87:96:1F
Extended Key Usage: TLS Web Server Authentication, TLS Web Client Authentication
CRL Distribution Points:
Full Name:
URI:http://crl3.digicert.com/CloudflareIncECCCA-3.crl

Full Name:
URI:http://crl4.digicert.com/CloudflareIncECCCA-3.crl

Certificate Policies: Policy: 2.23.140.1.2.2
CPS: http://www.digicert.com/CPS

Authority Information Access: OCSP - URI:http://ocsp.digicert.com
CA Issuers - URI:http://cacerts.digicert.com/CloudflareIncECCCA-3.crt

SCT List: Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 29:79:BE:F0:9E:39:39:21:F0:56:73:9F:63:A5:77:E5:
BE:57:7D:9C:60:0A:F8:F9:4D:5D:26:5C:25:5D:C7:84
Timestamp : May 10 21:18:04.157 2021 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:20:7F:2A:B3:9A:EF:FE:E1:88:AD:97:3A:3A:
EF:98:6B:0D:DC:20:FA:06:70:98:42:45:E3:1B:5A:81:
1D:BC:70:B1:02:21:00:DA:F2:58:BA:30:FF:08:E0:D7:
B5:2F:53:66:0F:7D:A6:39:CA:A7:5C:A3:E8:9C:6B:D4:
82:AE:B9:65:F6:00:1C
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 22:45:45:07:59:55:24:56:96:3F:A1:2F:F1:F7:6D:86:
E0:23:26:63:AD:C0:4B:7F:5D:C6:83:5C:6E:E2:0F:02
Timestamp : May 10 21:18:02.868 2021 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:44:02:20:28:80:70:51:4A:01:28:BE:06:4F:A2:20:
85:55:A8:60:4A:50:84:B3:D0:80:EF:68:BB:49:B2:6B:
06:86:AD:1A:02:20:3B:4C:9D:7B:1C:64:1A:1F:34:87:
B2:D0:77:28:6A:CE:B2:4D:81:BB:AF:1B:25:66:B1:46:
5C:23:7F:E9:48:F1
Signed Certificate Timestamp:
Version : v1 (0x0)
Log ID : 51:A3:B0:F5:FD:01:79:9C:56:6D:B8:37:78:8F:0C:A4:
7A:CC:1B:27:CB:F7:9E:88:42:9A:0D:FE:D4:8B:05:E5
Timestamp : May 10 21:18:03.471 2021 GMT
Extensions: none
Signature : ecdsa-with-SHA256
30:45:02:20:26:C5:EC:BC:9A:3B:E2:F2:0C:A5:C0:88:
CE:62:D7:D2:B1:92:28:C7:37:5C:3C:F4:91:9E:49:4C:
80:E1:C4:0A:02:21:00:B5:25:C5:4B:30:DD:02:95:96:
BF:AD:7A:BE:98:9B:05:B7:62:B3:D5:D1:D0:73:DF:AD:
DC:BF:2C:44:EA:4C:2A
Key Usage: Digital Signature
Basic Constraints: CA:FALSE
Subject Alternative Name: DNS:4ebooks.org
DNS:sni.cloudflaressl.com
DNS:*.4ebooks.org
Technical

DNS Lookup

HTTP Response Headers

HTTP-Code: HTTP/1.1 200 OK
Date: 23rd July, 2021
Content-Type: text/html; charset=UTF-8
Server: cloudflare
Connection: keep-alive
Link: <http://4ebooks.org/wp-json/>; rel="https://api.w.org/"
Vary: User-Agent
CF-Cache-Status: DYNAMIC
Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=Zk%2FEFuri1CrYBVNbbBinZQ6h7RZ12%2BKnsJzVcg7sttIeqlCKBe6nwNX6Cr2V5KmeJdar3SXHlq1YHodlxb7yPQ%2FPUVPIzeBOOOcvsh20tg5BoaYeEsAchI%2FmqaBA5A%3D%3D"}],"group":"cf-nel","max_age":604800}
NEL: {"report_to":"cf-nel","max_age":604800}
CF-RAY: 6736c625c8eb1a38-EWR

Whois Lookup

Created: 26th April, 2008
Changed: 29th November, 2020
Expires: 26th April, 2022
Registrar: NAMECHEAP INC
Status: ok
Nameservers: chip.ns.cloudflare.com
meg.ns.cloudflare.com
Owner Name: Withheld for Privacy Purposes
Owner Organization: Privacy service provided by Withheld for Privacy ehf
Owner Street: Kalkofnsvegur 2
Owner Post Code: 101
Owner City: Reykjavik
Owner State: Capital Region
Owner Country: IS
Owner Phone: +354.4212434
Owner Email: a706be76f6f74987ada4ae0298f7e1a9.protect@withheldforprivacy.com
Admin Name: Withheld for Privacy Purposes
Admin Organization: Privacy service provided by Withheld for Privacy ehf
Admin Street: Kalkofnsvegur 2
Admin Post Code: 101
Admin City: Reykjavik
Admin State: Capital Region
Admin Country: IS
Admin Phone: +354.4212434
Admin Email: a706be76f6f74987ada4ae0298f7e1a9.protect@withheldforprivacy.com
Tech Name: Withheld for Privacy Purposes
Tech Organization: Privacy service provided by Withheld for Privacy ehf
Tech Street: Kalkofnsvegur 2
Tech Post Code: 101
Tech City: Reykjavik
Tech State: Capital Region
Tech Country: IS
Tech Phone: +354.4212434
Tech Email: a706be76f6f74987ada4ae0298f7e1a9.protect@withheldforprivacy.com
Full Whois: Domain name: 4ebooks.org
Registry Domain ID: D152554156-LROR
Registrar WHOIS Server: whois.namecheap.com
Registrar URL: http://www.namecheap.com
Updated Date: 2020-11-29T19:37:08.40Z
Creation Date: 2008-04-26T21:49:18.00Z
Registrar Registration Expiration Date: 2022-04-26T21:49:18.00Z
Registrar: NAMECHEAP INC
Registrar IANA ID: 1068
Registrar Abuse Contact Email: abuse@namecheap.com
Registrar Abuse Contact Phone: +1.6613102107
Reseller: NAMECHEAP INC
Domain Status: ok https://icann.org/epp#ok
Registry Registrant ID:
Registrant Name: Withheld for Privacy Purposes
Registrant Organization: Privacy service provided by Withheld for Privacy ehf
Registrant Street: Kalkofnsvegur 2
Registrant City: Reykjavik
Registrant State/Province: Capital Region
Registrant Postal Code: 101
Registrant Country: IS
Registrant Phone: +354.4212434
Registrant Phone Ext:
Registrant Fax:
Registrant Fax Ext:
Registrant Email: a706be76f6f74987ada4ae0298f7e1a9.protect@withheldforprivacy.com
Registry Admin ID:
Admin Name: Withheld for Privacy Purposes
Admin Organization: Privacy service provided by Withheld for Privacy ehf
Admin Street: Kalkofnsvegur 2
Admin City: Reykjavik
Admin State/Province: Capital Region
Admin Postal Code: 101
Admin Country: IS
Admin Phone: +354.4212434
Admin Phone Ext:
Admin Fax:
Admin Fax Ext:
Admin Email: a706be76f6f74987ada4ae0298f7e1a9.protect@withheldforprivacy.com
Registry Tech ID:
Tech Name: Withheld for Privacy Purposes
Tech Organization: Privacy service provided by Withheld for Privacy ehf
Tech Street: Kalkofnsvegur 2
Tech City: Reykjavik
Tech State/Province: Capital Region
Tech Postal Code: 101
Tech Country: IS
Tech Phone: +354.4212434
Tech Phone Ext:
Tech Fax:
Tech Fax Ext:
Tech Email: a706be76f6f74987ada4ae0298f7e1a9.protect@withheldforprivacy.com
Name Server: chip.ns.cloudflare.com
Name Server: meg.ns.cloudflare.com
DNSSEC: unsigned
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of WHOIS database: 2021-07-22T21:54:28.99Z <<<
For more information on Whois status codes, please visit https://icann.org/epp

Nameservers

Name IP Address
chip.ns.cloudflare.com 108.162.193.84
meg.ns.cloudflare.com 173.245.58.196
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Subdomains

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