Lighthouse Mobile

· 0 checks — Mobile Lighthouse audit -- Performance, Accessibility, Best Practices, and SEO category breakdown.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Request	Cache TTL	Transfer Size
www.sphinx-doc.org/en/master/_images/linux-logo.png	14400.0 s	349.4 KiB
www.sphinx-doc.org/_/static/javascript/readthedocs-addons.js	14400.0 s	132.3 KiB
www.sphinx-doc.org/en/master/_images/python-logo.png	14400.0 s	57.0 KiB
www.sphinx-doc.org/en/master/_images/jupyter-logo.png	14400.0 s	42.1 KiB
www.sphinx-doc.org/en/master/_static/sphinx13.css?v=ba1752c5	14400.0 s	6.2 KiB
www.sphinx-doc.org/en/master/_static/basic.css?v=29da98fa	14400.0 s	4.5 KiB
www.sphinx-doc.org/en/master/_static/sphinx_highlight.js?v=6ffebe34	14400.0 s	3.1 KiB
www.sphinx-doc.org/en/master/_static/doctools.js?v=fd6eb6e6	14400.0 s	2.6 KiB
www.sphinx-doc.org/en/master/_static/pygments.css?v=b86133f3	14400.0 s	2.1 KiB
www.sphinx-doc.org/en/master/_static/sphinx-logo.svg	14400.0 s	1.5 KiB
www.sphinx-doc.org/en/master/_static/documentation_options.js?v=7ac69e55	14400.0 s	1.2 KiB
www.sphinx-doc.org/en/master/_static/graphviz.css?v=4ae1632d	14400.0 s	1.1 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Resource Size	Est Savings
Linux Logo `div.sphinx-users-logos > figure#id3 > a.reference > img`	www.sphinx-doc.org/en/master/_images/linux-logo.png	348.3 KiB	347.7 KiB
Python Logo `div.sphinx-users-logos > figure#id2 > a.reference > img`	www.sphinx-doc.org/en/master/_images/python-logo.png	55.9 KiB	55.8 KiB
Jupyter Logo `div.sphinx-users-logos > figure#id4 > a.reference > img`	www.sphinx-doc.org/en/master/_images/jupyter-logo.png	41.0 KiB	40.9 KiB

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
www.sphinx-doc.org/en/master/_static/sphinx_highlight.js?v=6ffebe34	3.1 KiB
www.sphinx-doc.org/en/master/_static/basic.css?v=29da98fa	4.5 KiB
www.sphinx-doc.org/en/master/_static/documentation_options.js?v=7ac69e55	1.2 KiB
www.sphinx-doc.org/en/master/_static/sphinx13.css?v=ba1752c5	6.2 KiB
www.sphinx-doc.org/en/master/_static/pygments.css?v=b86133f3	2.1 KiB
www.sphinx-doc.org/en/master/_static/graphviz.css?v=4ae1632d	1.1 KiB
www.sphinx-doc.org/en/master/_static/doctools.js?v=fd6eb6e6	2.6 KiB

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

Redirects introduce additional delays before the page can be loaded. Learn how to avoid page redirects.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.6 s

URL	Time Spent
sphinx-doc.org/	801 ms
www.sphinx-doc.org/	800 ms
www.sphinx-doc.org/en/master/	0.0 ms

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Time to Interactive is the amount of time it takes for the page to become fully interactive. Learn more about the Time to Interactive metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

TTI

Diagnostics

Reduce unused JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 300 ms 48.8 KiB

URL	Transfer Size	Est Savings
www.sphinx-doc.org/_/static/javascript/readthedocs-addons.js	131.5 KiB	48.8 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL
Linux Logo `div.sphinx-users-logos > figure#id3 > a.reference > img`	www.sphinx-doc.org/en/master/_images/linux-logo.png
Jupyter Logo `div.sphinx-users-logos > figure#id4 > a.reference > img`	www.sphinx-doc.org/en/master/_images/jupyter-logo.png
Python Logo `div.sphinx-users-logos > figure#id2 > a.reference > img`	www.sphinx-doc.org/en/master/_images/python-logo.png
logo `div.pageheader > div.brand > a > img`	www.sphinx-doc.org/en/master/_static/sphinx-logo.svg

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

●Minify CSS

●Minify JavaScript

●Reduce unused CSS

●Avoids enormous network payloads Total size was 618 KiB

●JavaScript execution time 0.4 s

●Minimizes main-thread work 0.9 s

●Avoid long main-thread tasks 4 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 20 ms

●Server Backend Latencies 50 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 50 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.

ARIA

Some ARIA roles have required attributes that describe the state of the element to screen readers. Learn more about roles and required attributes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
The Basics `section#sphinx > section#get-started > div.toctree-wrapper > p.caption`
User guide `section#sphinx > section#user-guide > div.toctree-wrapper > p.caption`
Community `section#sphinx > section#community-guide > div.toctree-wrapper > p.caption`
Reference `section#sphinx > section#reference-guide > div.toctree-wrapper > p.caption`

These are opportunities to improve the usage of ARIA in your application which may enhance the experience for users of assistive technology, like a screen reader.

Best practices

Touch targets with sufficient size and spacing help users who may have difficulty targeting small controls to activate the targets. Learn more about touch targets.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Installing Sphinx `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
PyPI package `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Conda package `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
OS-specific package manager `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Docker `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Installation from source `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Getting started `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Defining document structure `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Adding content `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Running the build `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Documenting objects `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Basic configuration `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Autodoc `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Intersphinx `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
More topics to be covered `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Build your first project `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Getting started `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
More Sphinx customization `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Describing code in Sphinx `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Where to go from here `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Using Sphinx `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
reStructuredText `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Markdown `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Cross-references `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Configuration `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Builders `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Domains `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Extensions `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
HTML theming `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Internationalization `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Sphinx Web Support `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Extending Sphinx `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Tutorials `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
How-tos `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Sphinx API `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Important objects `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Build phases `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Extension metadata `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
LaTeX customization `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
LaTeX macros and environments `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Get support `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Contribute to Sphinx `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Contributing to Sphinx `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Sphinx’s release process `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Sphinx FAQ `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
How do I… `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Using Sphinx with… `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Sphinx vs. Docutils `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Epub info `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Texinfo info `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Sphinx authors `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Maintainers `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Contributors `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Former maintainers `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Command-line tools `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Core applications `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Additional applications `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Configuration `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Project tags `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Project information `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
General configuration `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Builder options `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Domain options `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Extension options `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Example configuration file `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Extensions `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Built-in extensions `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Third-party extensions `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
reStructuredText `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
reStructuredText Primer `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Roles `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Directives `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Field Lists `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Glossary `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Changelog `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Prior releases `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Projects using Sphinx `div.toctree-wrapper > ul > li.toctree-l1 > a.reference`
Documentation using Furo theme `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Books produced using Sphinx `li.toctree-l1 > ul > li.toctree-l2 > a.reference`
Theses produced using Sphinx `li.toctree-l1 > ul > li.toctree-l2 > a.reference`

These items highlight common accessibility best practices.

○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]` 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

●Heading elements appear in a sequentially-descending order

●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.

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

○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.

100

Best Practices

●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

●Displays images with correct aspect ratio

●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

●Mitigate clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Ensure proper origin isolation with COOP

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

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`