Lighthouse Desktop

· 0 checks — Desktop 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.

Consider setting font-display to swap or optional to ensure text is consistently visible. swap can be further optimized to mitigate layout shifts with font metric overrides.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Est Savings
/static/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_Math-Ital...	175 ms
/static/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_Size1-Reg...	165 ms
/static/mathjax/fonts/HTML-CSS/TeX/woff/MathJax_Main-Regu...	65 ms
/s/googlesymbols/v419/HhzZU5Ak9u-oMExPeInvcuEmPosC9zS3FYk...	35 ms
/s/googlesanstext/v25/5aUu9-KzpRiLCAt4Unrc-xIKmCU5qEp2i0V...	10 ms
/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...	10 ms
fonts.gstatic.com/s/roboto/v51/KFO7CnqEu92Fr1ME7kSn66aGLdTylUAMa3yUBHMdazQ.woff2	10 ms
/s/googlesanstext/v25/5aUp9-KzpRiLCAt4Unrc-xIKmCU5oLlVngZ...	10 ms
/s/googlesanstext/v25/5aUp9-KzpRiLCAt4Unrc-xIKmCU5oLlVnmh...	5.0 ms
/s/googlesanstext/v25/5aUp9-KzpRiLCAt4Unrc-xIKmCU5oPFTnmh...	5.0 ms
/s/googlesanstext/v25/5aUu9-KzpRiLCAt4Unrc-xIKmCU5qCR2i0V...	5.0 ms
/s/googlesans/v67/4UasrENHsxJlGDuGo1OIlJfC6l_24rlCK1Yo_Iq...	5.0 ms

A forced reflow occurs when JavaScript queries geometric properties (such as offsetWidth) after styles have been invalidated by a change to the DOM state. This can result in poor performance. Learn more about forced reflows and possible mitigations.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:source label:Top function call valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:18.966 source:map[column:40 line:7813 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]]]

headings: [map[key:source label:Source valueType:source-location] map[granularity:1 key:reflowTime label:Total reflow time valueType:ms]]

items: [map[reflowTime:0.832 source:map[column:72 line:8210 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:28.716 source:map[type:text value:[unattributed]]] map[reflowTime:26.506 source:map[column:3649 line:56 type:source-location url:https://colab.research.google.com/static/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.5 urlProvider:network]] map[reflowTime:10.586 source:map[column:3719 line:56 type:source-location url:https://colab.research.google.com/static/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.5 urlProvider:network]] map[reflowTime:6.48 source:map[column:3866 line:56 type:source-location url:https://colab.research.google.com/static/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.5 urlProvider:network]] map[reflowTime:8.422 source:map[column:2168 line:56 type:source-location url:https://colab.research.google.com/static/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.5 urlProvider:network]] map[reflowTime:4.743 source:map[column:2257 line:56 type:source-location url:https://colab.research.google.com/static/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.5 urlProvider:network]] map[reflowTime:0.45 source:map[column:12157 line:56 type:source-location url:https://colab.research.google.com/static/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.5 urlProvider:network]] map[reflowTime:2.981 source:map[column:346 line:8043 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:0.636 source:map[column:81 line:8032 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:8.914 source:map[column:165 line:7812 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:0.079 source:map[column:198 line:7812 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:0.066 source:map[column:231 line:7812 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:0.062 source:map[column:269 line:7812 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:0.061 source:map[column:308 line:7812 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:0.08 source:map[column:346 line:7812 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:0.067 source:map[column:383 line:7812 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:10.376 source:map[column:352 line:7813 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:11.68 source:map[column:332 line:7441 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:5.218 source:map[column:152 line:7442 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:17.184 source:map[column:244 line:4978 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:0.252 source:map[column:300 line:2242 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:14.099 source:map[column:43 line:2241 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]] map[reflowTime:16.18 source:map[column:386 line:7859 type:source-location url:https://ssl.gstatic.com/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1b28/external_binary.js urlProvider:network]]]

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

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	Duration
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	1.5 MiB	1.7 s
/static/mathjax/MathJax.js?config=TeX-AMS_HTML-full,Safe&...	19.0 KiB	80 ms
/css?family=Roboto:300,400,500,600,700\|Google+Sans:300,40...	4.1 KiB
fonts.googleapis.com/css2?family=Google+Symbols:FILL@0..1&display=block	919 B	239 ms
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	21.5 KiB
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	35.8 KiB	291 ms
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	9.1 KiB
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	7.1 KiB

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.gstatic.com/feedback/js/help/prod/service/lazy.min.js	3000.0 s	39.6 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
www.gstatic.com/recaptcha/api2/logo_48.png	604800.0 s	2.2 KiB

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

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: 1.6 s 2.3 MiB

URL	Transfer Size	Est Savings
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	1.5 MiB	898.3 KiB
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	836.5 KiB	603.5 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	361.6 KiB	244.3 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	361.6 KiB	180.0 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	361.6 KiB	177.0 KiB
www.googletagmanager.com/gtag/js?id=G-S3V05QCXK5&cx=c&_slc=1	148.1 KiB	64.1 KiB
colab.research.google.com/static/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.5	88.9 KiB	57.8 KiB
/og/_/js/k=og.qtm.en_US.Z6E9e-jZ3gE.2019.O/rt=j/m=qabr,q_...	84.1 KiB	57.8 KiB
/_/scs/abc-static/_/js/k=gapi.gapi.en.5G9F9JPGjf8.O/m=cli...	70.0 KiB	55.7 KiB
www.gstatic.com/feedback/js/help/prod/service/lazy.min.js	39.1 KiB	30.2 KiB
/_/scs/abc-static/_/js/k=gapi.gapi.en.5G9F9JPGjf8.O/m=gap...	39.2 KiB	24.6 KiB

Consider reducing the time spent parsing, compiling, and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to reduce Javascript execution time.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Total CPU Time	Script Evaluation	Script Parse
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	1.1 s	889 ms	2.7 ms
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	467 ms	341 ms	113 ms
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	440 ms	242 ms	181 ms
colab.research.google.com/	263 ms	8.6 ms	5.0 ms
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	180 ms	56 ms	109 ms
Unattributable	172 ms	27 ms	0.0 ms
/static/mathjax/jax/output/HTML-CSS/fonts/TeX/fontdata.js...	61 ms	12 ms	1.4 ms
www.googletagmanager.com/gtag/js?id=G-S3V05QCXK5&cx=c&_slc=1	58 ms	44 ms	13 ms

Consider reducing the time spent parsing, compiling and executing JS. You may find delivering smaller JS payloads helps with this. Learn how to minimize main-thread work

Why this matters

Performance issues directly impact user engagement and conversion rates.

Category	Time Spent
Script Evaluation	1.9 s
Script Parsing & Compilation	468 ms
Style & Layout	348 ms
Other	215 ms
Parse HTML & CSS	68 ms
Garbage Collection	58 ms
Rendering	39 ms

Many navigations are performed by going back to a previous page, or forwards again. The back/forward cache (bfcache) can speed up these return navigations. Learn more about the bfcache

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failure reason	Failure type
The page has an unload handler in the main frame.	Actionable

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 80.9 KiB

URL	Transfer Size	Est Savings
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/styles__ltr.css	41.6 KiB	40.1 KiB
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	35.2 KiB	30.2 KiB
.codicon-add:before { content: '\ea60'; } …	10.7 KiB	10.6 KiB

Large network payloads cost users real money and are highly correlated with long load times. Learn how to reduce payload sizes.

Why this matters

Performance issues directly impact user engagement and conversion rates.

URL	Transfer Size
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	1.5 MiB
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	836.5 KiB
/s/googlesymbols/v419/HhzZU5Ak9u-oMExPeInvcuEmPosC9zS3FYk...	534.3 KiB
/v2/external/notebooks/intro.ipynb?vrz=colab-external_202...	432.3 KiB
www.gstatic.com/recaptcha/releases/gTpTIWhbKpxADzTzkcabhXN4/recaptcha__en.js	361.7 KiB
www.googletagmanager.com/gtag/js?id=G-S3V05QCXK5&cx=c&_slc=1	148.4 KiB
/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1...	124.0 KiB
colab.research.google.com/static/mathjax/config/TeX-AMS_HTML-full.js?V=2.7.5	89.0 KiB
/og/_/js/k=og.qtm.en_US.Z6E9e-jZ3gE.2019.O/rt=j/m=qabr,q_...	84.2 KiB
/_/scs/abc-static/_/js/k=gapi.gapi.en.5G9F9JPGjf8.O/m=cli...	70.1 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
logo.webp `div.markdown > span > p > img`

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

●Layout shift culprits

●Document request latency

●Optimize DOM size

●Improve image delivery

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 26 user timings

●Avoid long main-thread tasks 8 long tasks found

●Network Requests

●Network Round Trip Times 0 ms

●Server Backend Latencies 90 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 60 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

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 parent roles must contain specific child roles to perform their intended accessibility functions. Learn more about roles and required children elements.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
File Edit View Insert Runtime Tools Help `div#header-doc-toolbar > div.menubar-wrapper > div > div#top-menubar`

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.

Names and labels

Screen reader users rely on frame titles to describe the contents of frames. Learn more about frame titles.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.output-iframe-sizer > div > div.outputview > iframe `div.output-iframe-sizer > div > div.outputview > iframe`

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

○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

●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.

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

●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.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

○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

○`[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

○`<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

○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.

○Identical links have the same purpose.

○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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
Thumbnail for a video showing 3 AI-powered Google Colab features `span > center > a > img`		336 x 188 (1.79)	900 x 512 (1.76)

General

Deprecated APIs will eventually be removed from the browser. Learn more about deprecated APIs.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Deprecation / Warning	Source
Unload event listeners are deprecated and will be removed.	/colaboratory-static/common/624e67562667e7b52c4396bf2d5d1... line 4775, col 830

Errors logged to the console indicate unresolved problems. They can come from network request failures and other browser concerns. Learn more about this errors in console diagnostic audit

Why this matters

Performance issues directly impact user engagement and conversion rates.

Source	Description
/$rpc/google.internal.colab.v1.UserInfoService/GetUserInfo	`Failed to load resource: the server responded with a status of 401 ()`
/$rpc/google.internal.colab.v1.UserInfoService/GetUserInfo	`Failed to load resource: the server responded with a status of 401 ()`

●Uses HTTPS

●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 issues in the `Issues` panel in Chrome Devtools

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Ensure CSP is effective against XSS attacks

○Mitigate clickjacking with XFO or CSP

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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

○robots.txt is valid

○Document has a valid `rel=canonical`