C — https://www.gutenberg.org

Site Health

Score: 78 / 100

Based on 8 categories, 0 sections

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

Top Priorities (5)

Content-Security-Policy header is missing

Security › Security Headers

HSTS header is missing

Security › Security Headers

No Content-Security-Policy header found

Security › Content Security Policy

2 control(s) without accessible label

Accessibility › Form Accessibility

20 image-only link(s) without alt text

Accessibility › Link & Button Quality

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.52 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

1.82 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.68 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

1.82 s

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

Polyfills and transforms enable older browsers to use new JavaScript features. However, many aren't necessary for modern browsers. Consider modifying your JavaScript build process to not transpile Baseline features, unless you know you must support older browsers. Learn why most sites can deploy ES6+ code without transpiling

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Request	Cache TTL	Transfer Size
www.gutenberg.org/gutenberg/gutenberg-globals.css	0.0 ms	61.3 KiB
www.gutenberg.org/cache/epub/78382/pg78382.cover.medium.jpg	0.0 ms	41.1 KiB
www.gutenberg.org/cache/epub/1342/pg1342.cover.medium.jpg	0.0 ms	31.1 KiB
www.gutenberg.org/cache/epub/2701/pg2701.cover.medium.jpg	0.0 ms	27.0 KiB
www.gutenberg.org/cache/epub/78378/pg78378.cover.medium.jpg	0.0 ms	24.3 KiB
www.gutenberg.org/cache/epub/37683/pg37683.cover.medium.jpg	0.0 ms	23.9 KiB
www.gutenberg.org/cache/epub/64317/pg64317.cover.medium.jpg	0.0 ms	21.1 KiB
www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg	0.0 ms	21.1 KiB
www.gutenberg.org/cache/epub/100/pg100.cover.medium.jpg	0.0 ms	21.0 KiB
www.gutenberg.org/cache/epub/78380/pg78380.cover.medium.jpg	0.0 ms	20.2 KiB
www.gutenberg.org/cache/epub/78383/pg78383.cover.medium.jpg	0.0 ms	18.6 KiB
www.gutenberg.org/cache/epub/1513/pg1513.cover.medium.jpg	0.0 ms	17.7 KiB
www.gutenberg.org/cache/epub/78386/pg78386.cover.medium.jpg	0.0 ms	16.1 KiB
www.gutenberg.org/gutenberg/pg-logo-129x80.png	0.0 ms	15.6 KiB
www.gutenberg.org/cache/epub/78379/pg78379.cover.medium.jpg	0.0 ms	15.5 KiB
www.gutenberg.org/cache/epub/84/pg84.cover.medium.jpg	0.0 ms	14.5 KiB
www.gutenberg.org/cache/epub/45304/pg45304.cover.medium.jpg	0.0 ms	14.3 KiB
www.gutenberg.org/cache/epub/768/pg768.cover.medium.jpg	0.0 ms	14.2 KiB
www.gutenberg.org/cache/epub/78381/pg78381.cover.medium.jpg	0.0 ms	12.5 KiB
www.gutenberg.org/cache/epub/78385/pg78385.cover.medium.jpg	0.0 ms	12.1 KiB
www.gutenberg.org/cache/epub/78377/pg78377.cover.medium.jpg	0.0 ms	11.4 KiB
www.gutenberg.org/cache/epub/78384/pg78384.cover.medium.jpg	0.0 ms	7.8 KiB
www.gutenberg.org/gutenberg/ibiblio-logo.png	0.0 ms	5.6 KiB
www.gutenberg.org/gutenberg/b_news_icon.png	0.0 ms	4.3 KiB
www.gutenberg.org/gutenberg/m_news_icon.png	0.0 ms	3.4 KiB
www.gutenberg.org/gutenberg/m_icon.png	0.0 ms	2.8 KiB
www.gutenberg.org/gutenberg/b_icon.png	0.0 ms	2.7 KiB
www.gutenberg.org/pics/en_US.gif	0.0 ms	1.5 KiB
www.gutenberg.org/gutenberg/f_news_icon.png	0.0 ms	1.1 KiB
www.gutenberg.org/gutenberg/f_icon.png	0.0 ms	596 B

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78382/pg78382.cover.medium.jpg	41.0 KiB	31.3 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/1342/pg1342.cover.medium.jpg	30.9 KiB	21.8 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/2701/pg2701.cover.medium.jpg	26.8 KiB	17.6 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78378/pg78378.cover.medium.jpg	24.2 KiB	15.8 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/37683/pg37683.cover.medium.jpg	23.7 KiB	14.0 KiB
Project Gutenberg `header > div.logo-container > a#main_logo > img`	www.gutenberg.org/gutenberg/pg-logo-129x80.png	15.4 KiB	13.7 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg	20.9 KiB	11.9 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/64317/pg64317.cover.medium.jpg	21.0 KiB	11.7 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/100/pg100.cover.medium.jpg	20.8 KiB	11.7 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78380/pg78380.cover.medium.jpg	20.0 KiB	10.3 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78383/pg78383.cover.medium.jpg	18.5 KiB	8.9 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/1513/pg1513.cover.medium.jpg	17.6 KiB	7.9 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78386/pg78386.cover.medium.jpg	16.0 KiB	6.8 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78379/pg78379.cover.medium.jpg	15.3 KiB	6.2 KiB
ibiblio `body > div.footer > a > img`	www.gutenberg.org/gutenberg/ibiblio-logo.png	5.4 KiB	4.9 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/84/pg84.cover.medium.jpg	14.3 KiB	4.6 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/45304/pg45304.cover.medium.jpg	14.2 KiB	4.4 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/768/pg768.cover.medium.jpg	14.1 KiB	4.3 KiB

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

description: [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints help the browser establish a connection earlier in the page load, saving time when the first request for that origin is made. The following are the origins that the page preconnected to.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

URL	Transfer Size	Duration
www.gutenberg.org/gutenberg/gutenberg-globals.css	61.3 KiB	450 ms

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Estimated savings: 150 ms 20.2 KiB

URL	Transfer Size	Est Savings
www.gutenberg.org/gutenberg/gutenberg-globals.css	61.3 KiB	20.2 KiB

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Estimated savings: 300 ms 48.3 KiB

URL	Transfer Size	Est Savings
www.gutenberg.org/gutenberg/gutenberg-globals.css	61.2 KiB	48.3 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

	URL
Project Gutenberg `header > div.logo-container > a#main_logo > img`	www.gutenberg.org/gutenberg/pg-logo-129x80.png
Facebook news feed icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/f_news_icon.png
Bluesky icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/b_icon.png
Bluesky icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/b_news_icon.png
Mastodon icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/m_news_icon.png
Mastodon icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/m_icon.png
Facebook icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/f_icon.png

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Optimize DOM size

●Font display

●Forced reflow

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 1.8 s

●Max Potential First Input Delay 20 ms

●Minify JavaScript

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 511 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.6 s

●Avoid long main-thread tasks 2 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 540 ms

●Server Backend Latencies 170 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 470 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid non-composited animations

○Avoid large layout shifts

Accessibility

These checks highlight opportunities to improve the accessibility of your web app. Automatic detection can only detect a subset of issues and does not guarantee the accessibility of your web app, so manual testing is also encouraged.

Navigation

Properly ordered headings that do not skip levels convey the semantic structure of the page, making it easier to navigate and understand when using assistive technologies. Learn more about heading order.

Failing Elements
Find Free eBooks `div.homepage > div.info-box-container > div.info-box > h3`

These are opportunities to improve keyboard navigation in your application.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Image elements have `[alt]` attributes

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○Buttons have an accessible name

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○`<input type="image">` elements have `[alt]` text

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78383/pg78383.cover.medium.jpg	120 x 180 (0.67)	196 x 300 (0.65)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78381/pg78381.cover.medium.jpg	120 x 180 (0.67)	190 x 300 (0.63)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/2701/pg2701.cover.medium.jpg	120 x 180 (0.67)	190 x 300 (0.63)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/64317/pg64317.cover.medium.jpg	120 x 180 (0.67)	200 x 285 (0.70)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/1342/pg1342.cover.medium.jpg	120 x 180 (0.67)	200 x 281 (0.71)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78386/pg78386.cover.medium.jpg	120 x 180 (0.67)	187 x 300 (0.62)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78379/pg78379.cover.medium.jpg	120 x 180 (0.67)	187 x 300 (0.62)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78377/pg78377.cover.medium.jpg	120 x 180 (0.67)	187 x 300 (0.62)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/100/pg100.cover.medium.jpg	120 x 180 (0.67)	187 x 300 (0.62)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg	120 x 180 (0.67)	200 x 276 (0.72)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78378/pg78378.cover.medium.jpg	120 x 180 (0.67)	200 x 257 (0.78)

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Detected JavaScript libraries

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

Best Practices

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

766 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

806 ms

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

0 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

3.37 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

806 ms

Detailed Report

Audit breakdown by category with detailed findings.

Performance

Insights

Remove large, duplicate JavaScript modules from bundles to reduce unnecessary bytes consumed by network activity.

3rd party code can significantly impact load performance. Reduce and defer loading of 3rd party code to prioritize your page's content.

A long cache lifetime can speed up repeat visits to your page. Learn more about caching.

Request	Cache TTL	Transfer Size
www.gutenberg.org/gutenberg/gutenberg-globals.css	0.0 ms	61.3 KiB
www.gutenberg.org/cache/epub/78382/pg78382.cover.medium.jpg	0.0 ms	41.1 KiB
www.gutenberg.org/cache/epub/1342/pg1342.cover.medium.jpg	0.0 ms	31.1 KiB
www.gutenberg.org/cache/epub/2701/pg2701.cover.medium.jpg	0.0 ms	27.0 KiB
www.gutenberg.org/cache/epub/78378/pg78378.cover.medium.jpg	0.0 ms	24.3 KiB
www.gutenberg.org/cache/epub/37683/pg37683.cover.medium.jpg	0.0 ms	23.9 KiB
www.gutenberg.org/cache/epub/64317/pg64317.cover.medium.jpg	0.0 ms	21.1 KiB
www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg	0.0 ms	21.1 KiB
www.gutenberg.org/cache/epub/100/pg100.cover.medium.jpg	0.0 ms	21.0 KiB
www.gutenberg.org/cache/epub/78380/pg78380.cover.medium.jpg	0.0 ms	20.2 KiB
www.gutenberg.org/cache/epub/78383/pg78383.cover.medium.jpg	0.0 ms	18.6 KiB
www.gutenberg.org/cache/epub/1513/pg1513.cover.medium.jpg	0.0 ms	17.7 KiB
www.gutenberg.org/cache/epub/78386/pg78386.cover.medium.jpg	0.0 ms	16.1 KiB
www.gutenberg.org/gutenberg/pg-logo-129x80.png	0.0 ms	15.6 KiB
www.gutenberg.org/cache/epub/78379/pg78379.cover.medium.jpg	0.0 ms	15.5 KiB
www.gutenberg.org/cache/epub/84/pg84.cover.medium.jpg	0.0 ms	14.5 KiB
www.gutenberg.org/cache/epub/45304/pg45304.cover.medium.jpg	0.0 ms	14.3 KiB
www.gutenberg.org/cache/epub/768/pg768.cover.medium.jpg	0.0 ms	14.2 KiB
www.gutenberg.org/cache/epub/78381/pg78381.cover.medium.jpg	0.0 ms	12.5 KiB
www.gutenberg.org/cache/epub/78385/pg78385.cover.medium.jpg	0.0 ms	12.1 KiB
www.gutenberg.org/cache/epub/78377/pg78377.cover.medium.jpg	0.0 ms	11.4 KiB
www.gutenberg.org/cache/epub/78384/pg78384.cover.medium.jpg	0.0 ms	7.8 KiB
www.gutenberg.org/gutenberg/ibiblio-logo.png	0.0 ms	5.6 KiB
www.gutenberg.org/gutenberg/b_news_icon.png	0.0 ms	4.3 KiB
www.gutenberg.org/gutenberg/m_news_icon.png	0.0 ms	3.4 KiB
www.gutenberg.org/gutenberg/m_icon.png	0.0 ms	2.8 KiB
www.gutenberg.org/gutenberg/b_icon.png	0.0 ms	2.7 KiB
www.gutenberg.org/pics/en_US.gif	0.0 ms	1.5 KiB
www.gutenberg.org/gutenberg/f_news_icon.png	0.0 ms	1.1 KiB
www.gutenberg.org/gutenberg/f_icon.png	0.0 ms	596 B

Reducing the download time of images can improve the perceived load time of the page and LCP. Learn more about optimizing image size

	URL	Resource Size	Est Savings
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78382/pg78382.cover.medium.jpg	41.0 KiB	37.5 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/1342/pg1342.cover.medium.jpg	30.9 KiB	27.4 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/2701/pg2701.cover.medium.jpg	26.8 KiB	23.3 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78378/pg78378.cover.medium.jpg	24.2 KiB	20.7 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/37683/pg37683.cover.medium.jpg	23.7 KiB	20.2 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/64317/pg64317.cover.medium.jpg	21.0 KiB	17.4 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg	20.9 KiB	17.4 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/100/pg100.cover.medium.jpg	20.8 KiB	17.3 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78380/pg78380.cover.medium.jpg	20.0 KiB	16.5 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78383/pg78383.cover.medium.jpg	18.5 KiB	15.0 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/1513/pg1513.cover.medium.jpg	17.6 KiB	14.1 KiB
Project Gutenberg `header > div.logo-container > a#main_logo > img`	www.gutenberg.org/gutenberg/pg-logo-129x80.png	15.4 KiB	13.7 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78386/pg78386.cover.medium.jpg	16.0 KiB	12.4 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78379/pg78379.cover.medium.jpg	15.3 KiB	11.8 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/84/pg84.cover.medium.jpg	14.3 KiB	10.8 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/45304/pg45304.cover.medium.jpg	14.2 KiB	10.6 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/768/pg768.cover.medium.jpg	14.1 KiB	10.5 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78381/pg78381.cover.medium.jpg	12.4 KiB	8.9 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78385/pg78385.cover.medium.jpg	11.9 KiB	8.4 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78377/pg78377.cover.medium.jpg	11.2 KiB	7.7 KiB
ibiblio `body > div.footer > a > img`	www.gutenberg.org/gutenberg/ibiblio-logo.png	5.4 KiB	4.9 KiB
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78384/pg78384.cover.medium.jpg	7.6 KiB	4.9 KiB

Each subpart has specific improvement strategies. Ideally, most of the LCP time should be spent on loading the resources, not within delays.

headings: [map[key:label label:Subpart valueType:text] map[key:duration label:Duration valueType:ms]]

items: [map[duration:4602.600000003815 label:Time to first byte subpart:timeToFirstByte] map[duration:571.5089999961853 label:Element render delay subpart:elementRenderDelay]]

lhId: page-22-P

nodeLabel: Choose among free epub and Kindle eBooks, download them or read them online. Yo…

path: 1,HTML,1,BODY,0,DIV,2,DIV,1,DIV,1,P

selector: div.container > div.page_content > div.homepage > p#sub-slogan

snippet: <p id="sub-slogan">

Avoid chaining critical requests by reducing the length of chains, reducing the download size of resources, or deferring the download of unnecessary resources to improve page load.

title: Preconnected origins

value: no origins were preconnected

description: Add [preconnect](https://developer.chrome.com/docs/lighthouse/performance/uses-rel-preconnect/) hints to your most important origins, but try to use no more than 4.

title: Preconnect candidates

value: No additional origins are good candidates for preconnecting

Requests are blocking the page's initial render, which may delay LCP. Deferring or inlining can move these network requests out of the critical path.

URL	Transfer Size	Duration
www.gutenberg.org/gutenberg/gutenberg-globals.css	61.3 KiB	80 ms

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

These insights are also available in the Chrome DevTools Performance Panel - record a trace to view more detailed information.

Diagnostics

Reduce unused rules from stylesheets and defer CSS not used for above-the-fold content to decrease bytes consumed by network activity. Learn how to reduce unused CSS.

Estimated savings: 40 ms 52.0 KiB

URL	Transfer Size	Est Savings
www.gutenberg.org/gutenberg/gutenberg-globals.css	61.2 KiB	52.0 KiB

Minifying CSS files can reduce network payload sizes. Learn how to minify CSS.

Estimated savings: 0.0 ms 20.2 KiB

URL	Transfer Size	Est Savings
www.gutenberg.org/gutenberg/gutenberg-globals.css	61.3 KiB	20.2 KiB

Set an explicit width and height on image elements to reduce layout shifts and improve CLS. Learn how to set image dimensions

	URL
Project Gutenberg `header > div.logo-container > a#main_logo > img`	www.gutenberg.org/gutenberg/pg-logo-129x80.png
Facebook news feed icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/f_news_icon.png
Bluesky icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/b_icon.png
Bluesky icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/b_news_icon.png
Mastodon icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/m_news_icon.png
Mastodon icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/m_icon.png
Facebook icon `ul.icon-list > li > a > img`	www.gutenberg.org/gutenberg/f_icon.png

More information about the performance of your application. These numbers don't directly affect the Performance score.

●Layout shift culprits

●Optimize DOM size

●Font display

●Forced reflow

●Modern HTTP

●Optimize viewport for mobile

●Time to Interactive 0.8 s

●Max Potential First Input Delay 20 ms

●Minify JavaScript

●Reduce unused JavaScript

●Avoids enormous network payloads Total size was 511 KiB

●JavaScript execution time 0.0 s

●Minimizes main-thread work 0.2 s

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 230 ms

●Server Backend Latencies 450 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Initial server response time was short Root document took 460 ms

○INP breakdown

○LCP request discovery

○User Timing marks and measures

○Avoid long main-thread tasks

○Avoid non-composited animations

○Avoid large layout shifts

Accessibility

Navigation

Failing Elements
Find Free eBooks `div.homepage > div.info-box-container > div.info-box > h3`

These are opportunities to improve keyboard navigation in your application.

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

●`[role]`s have all required `[aria-*]` attributes

●`[role]` values are valid

●`[aria-*]` attributes have valid values

●`[aria-*]` attributes are valid and not misspelled

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●`<input type="image">` elements have `[alt]` text

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

●`<html>` element has a `[lang]` attribute

●`<html>` element has a valid value for its `[lang]` attribute

●Links are distinguishable without relying on color.

●Links have a discernible name

●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).

●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements

●No element has a `[tabindex]` value greater than 0

●Touch targets have sufficient size and spacing.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements have accessible names

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

○`[role]`s are contained by their required parent element

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

○`<frame>` or `<iframe>` elements have a title

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

○Skip links are focusable.

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

○`<video>` elements contain a `<track>` element with `[kind="captions"]`

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

○Image elements do not have `[alt]` attributes that are redundant text.

○Elements with visible text labels have matching accessible names.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78383/pg78383.cover.medium.jpg	120 x 180 (0.67)	196 x 300 (0.65)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78381/pg78381.cover.medium.jpg	120 x 180 (0.67)	190 x 300 (0.63)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/2701/pg2701.cover.medium.jpg	120 x 180 (0.67)	190 x 300 (0.63)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/64317/pg64317.cover.medium.jpg	120 x 180 (0.67)	200 x 285 (0.70)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/1342/pg1342.cover.medium.jpg	120 x 180 (0.67)	200 x 281 (0.71)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78386/pg78386.cover.medium.jpg	120 x 180 (0.67)	187 x 300 (0.62)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78379/pg78379.cover.medium.jpg	120 x 180 (0.67)	187 x 300 (0.62)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78377/pg78377.cover.medium.jpg	120 x 180 (0.67)	187 x 300 (0.62)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/100/pg100.cover.medium.jpg	120 x 180 (0.67)	187 x 300 (0.62)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/11/pg11.cover.medium.jpg	120 x 180 (0.67)	200 x 276 (0.72)
a > div.cover_image > div.cover_img > img `a > div.cover_image > div.cover_img > img`	www.gutenberg.org/cache/epub/78378/pg78378.cover.medium.jpg	120 x 180 (0.67)	200 x 257 (0.78)

●Uses HTTPS

●Avoids deprecated APIs

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

●No issues in the `Issues` panel in Chrome Devtools

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Detected JavaScript libraries

SEO

Content Best Practices

Meta descriptions may be included in search results to concisely summarize page content. Learn more about the meta description.

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Page has successful HTTP status code

●Links have descriptive text

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○Document has a valid `rel=canonical`

Browse & Analyze

Learn

Results for https://www.gutenberg.org

Site Health

Top Priorities (5)

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Navigation

Best Practices

User Experience

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Navigation

Best Practices

User Experience

SEO

Content Best Practices

Keyboard Shortcuts