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
/content/dam/images/discovery/editorial/shows/f/filthy-fo...	1904602.0 s	132.9 MiB
assets.adobedtm.com/launch-ENe37f8b8d568443619b43fb72877cfc3d.min.js	3600.0 s	109.9 KiB
c.amazon-adsystem.com/aax2/apstag.js	3600.0 s	90.9 KiB
cadmus.script.ac/d1ceotgqf1efo4/script.js	600.0 s	74.5 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	3600.0 s	73.1 KiB
cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js	86400.0 s	119.2 KiB
/content/dam/images/discovery/unsized/2025/Gold-Rush_S16_...	2336586.0 s	438.6 KiB
lightning.warnermediacdn.com/cdp/psm/i/web/release/4.4.0/psm.legacy.min.umd.js	600.0 s	38.7 KiB
btloader.com/tag?o=5762268746743808&upapi=true	300.0 s	30.9 KiB
cdn-gl.imrworldwide.com/novms/js/2/nlsSDK600.bundle.min.js	86400.0 s	73.4 KiB
cdn.id5-sync.com/api/1.0/esp.js	3600.0 s	34.8 KiB
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	900.0 s	21.7 KiB
b-code.liadm.com/a-01xy.min.js?_=1776802054619	86400.0 s	46.9 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
ep2.adtrafficquality.google/sodar/VFc2VJAc.js	3000.0 s	14.4 KiB
/jload?anId=925660&campId=300x90&pubId=5650094397&chanId=...	604800.0 s	92.3 KiB
cdn.cookielaw.org/scripttemplates/202505.2.0/otGPP.js	86400.0 s	22.3 KiB
s.yimg.com/wi/ytc.js	0.0 ms	7.1 KiB
/publisher/925660/ebfdc39c-b42a-11f0-aa09-0e6958f30139.mi...	0.0 ms	6.9 KiB
s.go-mpulse.net/boomerang/J7V3U-YDNZ5-4ZVLJ-FBC7B-DBDGV	604800.0 s	60.0 KiB
static.criteo.net/js/ld/publishertag.ids.js	86400.0 s	14.8 KiB
/logos/50417659-aa29-4f7f-b59d-f6e887deed53/0190c699-f351...	86400.0 s	11.6 KiB
/jsconfig/jload/925660?cbName=__IntegralAS__6725&anId=925...	0.0 ms	4.5 KiB
hgtvhome.sndimg.com/content/dam/images/discovery/unsized/group-2.png	2579208.0 s	45.7 KiB
/WRSiteInterceptEngine/?Q_ZID=ZN_2itH43TTzi1B8b3	3600.0 s	4.6 KiB
/content/dam/images/discovery/editorial/shows/n/naked-and...	700625.0 s	36.6 KiB
cdn.cookielaw.org/scripttemplates/otSDKStub.js	86400.0 s	9.1 KiB
/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERS...	604800.0 s	35.9 KiB
sb.scorecardresearch.com/internal-cs/default/beacon-and.js	86400.0 s	7.8 KiB
/conf/P808EB471-943D-4277-8CB8-8EB05C4E2003.js	86400.0 s	6.1 KiB
lightning.warnermediacdn.com/cdp/psm/brands/discovery/web/release/psm.min.js	600.0 s	2.5 KiB
code.adsales.snidigital.com/datmcp/mcp-loader.js	1800.0 s	2.4 KiB
dmp.im-apps.net/secure-signal/provider.js	3600.0 s	2.5 KiB
/content/dam/images/discovery/editorial/shows/c/contraban...	707091.0 s	19.8 KiB
/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERS...	604800.0 s	18.6 KiB
www.discovery.com/etc/clientlibs/assets/images/discovery/disco-plus-mobile.png	358792.0 s	7.5 KiB
/e090d2ba2d7e/fbb645d4812f/185be1e0ad3f/RCa19988acd8854b3...	3600.0 s	1.5 KiB
cdn.cookielaw.org/logos/static/powered_by_logo.svg	86400.0 s	2.6 KiB
tru.am/scripts/ta-pagesocial-sdk.js	2419200.0 s	10.9 KiB
www.discovery.com/etc/clientlibs/assets/images/discovery/disco-plus.png	429282.0 s	6.5 KiB
config.aps.amazon-adsystem.com/configs/3159	3600.0 s	1.1 KiB
/e090d2ba2d7e/fbb645d4812f/185be1e0ad3f/RC04d6332c45ff4c0...	3600.0 s	770 B
/e090d2ba2d7e/fbb645d4812f/185be1e0ad3f/RC5edfea8b576e4a6...	3600.0 s	761 B
/e090d2ba2d7e/fbb645d4812f/185be1e0ad3f/RC301108b9775b4b1...	3600.0 s	690 B
/e090d2ba2d7e/fbb645d4812f/185be1e0ad3f/RCf8d8f809e5e14e0...	3600.0 s	658 B
/t.png?l=DiSC-OODisplay&u=30632187_424773290_254357358_${...	0.0 ms	413 B
/usersync/liveintent/?cb=%2F%2Fi.liadm.com%2Fs%2F35004%3F...	0.0 ms	405 B
/t/beacon?pr=289167&adn=3&ca=30632187&si=9020348&pl=42477...	0.0 ms	367 B
zcb1mzb2pyoiek7mgz7zys0tgoq5q1776802060.nuid.imrworldwide.com/	0.0 ms	349 B
/pagead/js/r20260420/r20110914/elements/html/omrhp_fy2021.js	1209600.0 s	3.3 KiB
/track/cmb/generic?ttd_pid=liveintent&ttd_tpi=1&gdpr=0&us...	0.0 ms	255 B

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.

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
div.m-Card__m-MediaWrap > a.m-Card__m-ResponsiveImage--Link > div.m-Card__m-ResponsiveImage > img.m-ResponsiveImage__a-Image `div.m-Card__m-MediaWrap > a.m-Card__m-ResponsiveImage--Link > div.m-Card__m-ResponsiveImage > img.m-ResponsiveImage__a-Image`	/content/dam/images/discovery/editorial/shows/f/filthy-fo...	132.8 MiB	132.8 MiB
Fridays at 8/7c `div.m-Card__m-MediaWrap > a.m-Card__m-ResponsiveImage--Link > div.m-Card__m-ResponsiveImage > img.m-ResponsiveImage__a-Image`	/content/dam/images/discovery/unsized/2025/Gold-Rush_S16_...	438.1 KiB	393.2 KiB
By entering your email address, you agree to our Terms of Use and acknowledge t… `section.o-FollowUs > div.container > div.o-FollowUs__m-Body > section#mod-newsletter-1`	hgtvhome.sndimg.com/content/dam/images/discovery/unsized/group-2.png	45.4 KiB	34.2 KiB
Advertisement `div.GoogleActiveViewElement > div#gcc_CNnnafKmGK6M6tkPiobssQk > a#img_anch_CPLKobvf_5MDFS6GOgUdCgM7lg > img`	s0.2mdn.net/simgad/5972198250758903289	17.8 KiB	13.4 KiB
Sundays at 8/7c `div.m-Card__m-MediaWrap > a.m-Card__m-ResponsiveImage--Link > div.m-Card__m-ResponsiveImage > img.m-ResponsiveImage__a-Image`	/content/dam/images/discovery/editorial/shows/n/naked-and...	36.2 KiB	9.4 KiB
div.o-Header__m-ButtonLink > a.m-ButtonLinkWrap > span.m-ButtonLink__a-Icon > img `div.o-Header__m-ButtonLink > a.m-ButtonLinkWrap > span.m-ButtonLink__a-Icon > img`	www.discovery.com/etc/clientlibs/assets/images/discovery/disco-plus.png	6.2 KiB	5.2 KiB

Optimize LCP by making the LCP image discoverable from the HTML immediately, and avoiding lazy-loading

Why this matters

Performance issues directly impact user engagement and conversion rates.

lhId: page-1-IMG

nodeLabel: Fridays at 8/7c

path: 1,HTML,1,BODY,0,SECTION,2,DIV,1,DIV,0,DIV,0,DIV,2,SECTION,0,DIV,0,DIV,0,DIV,0,A,0,DIV,0,IMG

selector: div.m-Card__m-MediaWrap > a.m-Card__m-ResponsiveImage--Link > div.m-Card__m-ResponsiveImage > img.m-ResponsiveImage__a-Image

snippet: <img class="m-ResponsiveImage__a-Image a-Image" src="//discovery.sndimg.com/content/dam/images/discovery/unsized/2025/Gold-Rush…" alt="Fridays at 8/7c">

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

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
/etc/clientlibs/user-consent-disco.md5-18966a93b3e99f8a9d...	31.0 KiB	154 ms
/etc/clientlibs/ad-specific.min.md5-fc4185e43c29ae078652b...	732 B

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

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

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: 954 ms

URL	Time Spent
discovery.com/	954 ms
www.discovery.com/?aid=223105&cid=5624648&crid=273048896&event=creativeView	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.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 310 ms 64.1 KiB

URL	Transfer Size	Est Savings
/etc/clientlibs/assets/v3/css/discovery-mobile-include-fo...	47.1 KiB	45.8 KiB
	18.6 KiB	18.3 KiB

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: 3.3 s 816.6 KiB

URL	Transfer Size	Est Savings
/etc/clientlibs/assets/v3/js/core.md5-3603db039fd436a4e92...	246.0 KiB	198.4 KiB
www.googletagmanager.com/gtag/js?id=AW-935057167&_=1776802054618	134.1 KiB	102.0 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	187.7 KiB	87.4 KiB
cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js	119.0 KiB	65.9 KiB
www.googletagmanager.com/gtag/js?id=AW-935057167	134.1 KiB	53.9 KiB
cdn-gl.imrworldwide.com/novms/js/2/nlsSDK600.bundle.min.js	72.9 KiB	48.2 KiB
micro.rubiconproject.com/prebid/dynamic/11078.js	140.8 KiB	47.4 KiB
assets.adobedtm.com/launch-ENe37f8b8d568443619b43fb72877cfc3d.min.js	109.6 KiB	44.4 KiB
/jload?anId=925660&campId=300x90&pubId=5650094397&chanId=...	92.1 KiB	36.3 KiB
cdn.id5-sync.com/api/1.0/esp.js	34.4 KiB	30.8 KiB
/pagead/managed/js/activeview/current/ufs_web_display.js	73.1 KiB	30.3 KiB
/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERS...	35.7 KiB	24.9 KiB
c.amazon-adsystem.com/aax2/apstag.js	58.8 KiB	23.5 KiB
s.go-mpulse.net/boomerang/J7V3U-YDNZ5-4ZVLJ-FBC7B-DBDGV	59.8 KiB	23.1 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
Unattributable	4.1 s	475 ms	0.0 ms
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	2.1 s	1.8 s	108 ms
s.go-mpulse.net/boomerang/J7V3U-YDNZ5-4ZVLJ-FBC7B-DBDGV	1.6 s	922 ms	25 ms
cadmus.script.ac/d1ceotgqf1efo4/script.js	1.1 s	920 ms	78 ms
www.discovery.com/?aid=223105&cid=5624648&crid=273048896&event=creativeView	981 ms	444 ms	48 ms
/jsconfig/jload/925660?cbName=__IntegralAS__6725&anId=925...	677 ms	631 ms	2.0 ms
lightning.warnermediacdn.com/cdp/psm/brands/discovery/web/release/psm.min.js	635 ms	612 ms	1.5 ms
cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js	558 ms	428 ms	105 ms
/etc/clientlibs/user-consent-disco.md5-18966a93b3e99f8a9d...	526 ms	443 ms	17 ms
/pagead/managed/js/activeview/current/ufs_web_display.js	509 ms	470 ms	33 ms
/etc/clientlibs/assets/v3/js/core.md5-3603db039fd436a4e92...	463 ms	332 ms	91 ms
btloader.com/tag?o=5762268746743808&upapi=true	410 ms	380 ms	14 ms
cdn.cookielaw.org/scripttemplates/202505.2.0/otGPP.js	402 ms	379 ms	16 ms
code.adsales.snidigital.com/datmcp/3/DatMCP-3.128.3-1ec22ab641ade1e41b70.js	370 ms	322 ms	24 ms
micro.rubiconproject.com/prebid/dynamic/11078.js	348 ms	300 ms	44 ms
www.googletagmanager.com/gtag/js?id=AW-935057167	341 ms	291 ms	48 ms
assets.adobedtm.com/launch-ENe37f8b8d568443619b43fb72877cfc3d.min.js	292 ms	212 ms	69 ms
static.adsafeprotected.com/sca.17.6.4.js	270 ms	249 ms	11 ms
c.amazon-adsystem.com/aax2/apstag.js	226 ms	155 ms	50 ms
b-code.liadm.com/a-01xy.min.js?_=1776802054619	209 ms	172 ms	25 ms
/dxjsmodule/37.7ea1ffe71ad8c0799cc1.chunk.js?Q_CLIENTVERS...	188 ms	170 ms	11 ms
cdn-gl.imrworldwide.com/novms/js/2/nlsSDK600.bundle.min.js	169 ms	109 ms	58 ms
/extensions/EPb56e12d7054b4acea984e91c910051cc/AppMeasure...	149 ms	145 ms	2.5 ms
lightning.warnermediacdn.com/cdp/psm/i/web/release/4.4.0/psm.legacy.min.umd.js	138 ms	107 ms	16 ms
/jload?anId=925660&campId=300x90&pubId=5650094397&chanId=...	125 ms	90 ms	32 ms
config.aps.amazon-adsystem.com/configs/3159	124 ms	89 ms	0.8 ms
securepubads.g.doubleclick.net/tag/js/gpt.js	110 ms	99 ms	10 ms
cdn-gl.imrworldwide.com/conf/P808EB471-943D-4277-8CB8-8EB05C4E2003.js	102 ms	99 ms	2.6 ms
ep2.adtrafficquality.google/sodar/sodar2.js	91 ms	84 ms	2.1 ms
www.googletagmanager.com/gtag/js?id=AW-935057167&_=1776802054618	77 ms	38 ms	39 ms
static.criteo.net/js/ld/publishertag.ids.js	77 ms	70 ms	5.5 ms
secure.cdn.fastclick.net/js/pubcid/latest/pubcid.min.js	73 ms	62 ms	11 ms
www.google-analytics.com/analytics.js	71 ms	56 ms	5.2 ms
code.adsales.snidigital.com/datmcp/mcp-loader.js	68 ms	63 ms	1.1 ms
ep2.adtrafficquality.google/sodar/VFc2VJAc.js	59 ms	52 ms	6.2 ms
cdn.id5-sync.com/api/1.0/esp.js	56 ms	36 ms	13 ms
/dxjsmodule/12.1a2b7192fd54e87d3971.chunk.js?Q_CLIENTVERS...	52 ms	3.4 ms	44 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	11.7 s
Other	4.4 s
Script Parsing & Compilation	1.1 s
Style & Layout	482 ms
Garbage Collection	281 ms
Parse HTML & CSS	177 ms
Rendering	123 ms

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
/content/dam/images/discovery/editorial/shows/f/filthy-fo...	132.9 MiB
/content/dam/images/discovery/unsized/2025/Gold-Rush_S16_...	438.6 KiB
/etc/clientlibs/assets/v3/js/core.md5-3603db039fd436a4e92...	246.5 KiB
/pagead/managed/js/gpt/m202604160201/pubads_impl.js	187.7 KiB
micro.rubiconproject.com/prebid/dynamic/11078.js	141.1 KiB
www.googletagmanager.com/gtag/js?id=AW-935057167	134.5 KiB
www.googletagmanager.com/gtag/js?id=AW-935057167&_=1776802054618	134.2 KiB
cdn.cookielaw.org/scripttemplates/202505.2.0/otBannerSdk.js	119.2 KiB
assets.adobedtm.com/launch-ENe37f8b8d568443619b43fb72877cfc3d.min.js	109.9 KiB
/jload?anId=925660&campId=300x90&pubId=5650094397&chanId=...	92.3 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
div.o-Header__m-ButtonLink > a.m-ButtonLinkWrap > span.m-ButtonLink__a-Icon > img `div.o-Header__m-ButtonLink > a.m-ButtonLinkWrap > span.m-ButtonLink__a-Icon > img`	www.discovery.com/etc/clientlibs/assets/images/discovery/disco-plus.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

●Minify CSS

●Minify JavaScript

●User Timing marks and measures 13 user timings

●Avoid long main-thread tasks 20 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 160 ms

●Server Backend Latencies 250 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Initial server response time was short Root document took 40 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○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
What to Watch 6 SEASONS Moonshiners: Master Distiller Binge on discovery+ 9 SEA… `div.full-width > div.main > div.fullWidthPromo > section#mod-full-width-promo-2`

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.

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.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Fridays at 8/7c `div.o-FullWidthPromo__m-Body > div#mod-card-1 > div.m-Card__m-TextWrap > h3.m-Card__a-Headline`
Moonshiners `div#mod-on-tv-full-width-1 > div.m-ScheduleCard__m-TextWrap > div.m-ScheduleCard__m-ScheduleItem--OnNow > h5.m-ScheduleCard__a-Headline`

These are opportunities to improve keyboard navigation in your application.

Best practices

Disabling zooming is problematic for users with low vision who rely on screen magnification to properly see the contents of a web page. Learn more about the viewport meta tag.

Why this matters

Informational: a Permissions-Policy directive showing feature -> allowed origins.

Source: MDN Permissions-Policy

Failing Elements
head > meta `head > meta`

One main landmark helps screen reader users navigate a web page. Learn more about landmarks.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
html.js-support `html.js-support`

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

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

●`[role]` values are valid

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

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

●Buttons have an accessible name

●Form elements have associated labels

●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

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

●`<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.

●Deprecated ARIA roles were not used

●Uses ARIA roles only on compatible elements

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[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 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.

○Image elements have `[alt]` attributes

○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.

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

○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 natural dimensions should be proportional to the display size and the pixel ratio to maximize image clarity. Learn how to provide responsive images.

Why this matters

Performance issues directly impact user engagement and conversion rates.

	URL	Displayed size	Actual size	Expected size
div.o-Header__m-ButtonLink > a.m-ButtonLinkWrap > span.m-ButtonLink__a-Icon > img `div.o-Header__m-ButtonLink > a.m-ButtonLinkWrap > span.m-ButtonLink__a-Icon > img`	www.discovery.com/etc/clientlibs/assets/images/discovery/disco-plus.png	179 x 33	179 x 33	269 x 50

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
Topics	micro.rubiconproject.com/prebid/dynamic/11078.js line 20, col 84959
AttributionReporting
SharedStorage	/pagead/managed/js/activeview/current/ufs_web_display.js line 252, col 234

●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

●Displays images with correct aspect ratio

●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 DOM-based XSS with Trusted Types

●Detected JavaScript libraries

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○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.

Crawling and Indexing

Search engines may use `href` attributes on links to crawl websites. Ensure that the `href` attribute of anchor elements links to an appropriate destination, so more pages of the site can be discovered. Learn how to make links crawlable

Why this matters

Performance issues directly impact user engagement and conversion rates.

Uncrawlable Link
div.o-FullWidthPromo__m-Body > div#mod-card-3 > div.m-Card__m-MediaWrap > a.m-Card__m-ResponsiveImage--Link `div.o-FullWidthPromo__m-Body > div#mod-card-3 > div.m-Card__m-MediaWrap > a.m-Card__m-ResponsiveImage--Link`

To appear in search results, crawlers need access to your app.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links have descriptive text

●robots.txt is valid

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

○Image elements have `[alt]` attributes