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
marketing.astm.org/cdnr/forpci56/acton/bn/tracker/9652	0.0 ms	8.7 KiB
snap.licdn.com/li.lms-analytics/insight.min.js	86400.0 s	18.7 KiB
static.hotjar.com/c/hotjar-3719848.js?sv=6	60.0 s	6.2 KiB
js.zi-scripts.com/zi-tag.js	0.0 ms	5.7 KiB
/collect?v=2&fmt=js&pid=4091468&time=1776816095973&url=ht...	0.0 ms	692 B
/acton/bn/9652?target=https%3A%2F%2Fwww.astm.org%2F&ref=&...	0.0 ms	517 B
/p.css?s=1&k=bpp4kqc&ht=tk&f=39512.39513.39516.39517.3951...	604800.0 s	172 B

Layout shifts occur when elements move absent any user interaction. Investigate the causes of layout shifts, such as elements being added, removed, or their fonts changing as the page loads.

Why this matters

Performance issues directly impact user engagement and conversion rates.

headings: [map[key:node label:Element subItemsHeading:map[key:extra] valueType:node] map[granularity:0.001 key:score label:Layout shift score subItemsHeading:map[key:cause valueType:text] valueType:numeric]]

items: [map[node:map[type:text value:Total] score:0.179938] map[node:map[boundingRect:map[bottom:11491 height:10985 left:0 right:412 top:506 width:412] lhId:page-3-MAIN nodeLabel:New & Noteworthy Change With Accuris Agreement As of December 31, 2025, ASTM’s… path:1,HTML,1,BODY,4,MAIN selector:body.modal-open > main.container-xl snippet:<main class="container-xl styles_pageContainer__oDOhk"> type:node] score:0.176969] map[node:map[boundingRect:map[bottom:929 height:126 left:29 right:383 top:803 width:354] lhId:page-7-DIV nodeLabel:Change With Accuris Agreement As of December 31, 2025, ASTM’s agreement with A… path:1,HTML,1,BODY,4,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,DIV,0,DIV,1,DIV selector:div.position-relative > div.h-100 > div.d-flex > div.d-flex snippet:<div class="d-flex flex-column mb-2 ImageCards_textContainer__Fdu85"> type:node] score:0.001652 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:779 height:200 left:29 right:383 top:579 width:354] lhId:page-0-IMG nodeLabel:home-compass-noteworthy path:1,HTML,1,BODY,4,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,A,0,PICTURE,0,IMG selector:div.d-flex > a.image-container > picture.w-100 > img.m-auto snippet:<img alt="home-compass-noteworthy" loading="lazy" width="800" height="600" decoding="async" data-nimg="1" class="m-auto mw-100 mh-100 img-fluid" style="color:transparent" src="https://www.astm.org/v3/assets/blt5eb0a2cb04534832/blt326d673700682450/68b…"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:198 height:38 left:255 right:400 top:160 width:145] lhId:page-2-DIV nodeLabel:Search path:1,HTML,1,BODY,1,HEADER,1,DIV,1,DIV selector:body.modal-open > header.position-relative > div.container-xl > div.ms-auto snippet:<div class="ms-auto d-flex gap-2"> type:node] score:0.000763] map[node:map[boundingRect:map[bottom:198 height:38 left:255 right:400 top:160 width:145] lhId:page-2-DIV nodeLabel:Search path:1,HTML,1,BODY,1,HEADER,1,DIV,1,DIV selector:body.modal-open > header.position-relative > div.container-xl > div.ms-auto snippet:<div class="ms-auto d-flex gap-2"> type:node] score:0.000554 subItems:map[items:[map[cause:Web font extra:map[type:url value:https://www.astm.org/_next/static/media/fa-solid-900.1c1969ce.woff2]] map[cause:Web font extra:map[type:url value:https://www.astm.org/_next/static/media/fa-brands-400.5bc0fb2c.woff2]]] type:subitems]]]

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.

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
www.astm.org/_next/static/media/fa-regular-400.c432bd7d.woff2	475 ms
www.astm.org/_next/static/media/fa-brands-400.5bc0fb2c.woff2	80 ms
www.astm.org/_next/static/media/fa-solid-900.1c1969ce.woff2	55 ms
/af/98fb6b/00000000000000007735bb14/31/l?primer=7cdcb44be...	5.0 ms

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

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

items: [map[duration:1766.653 label:Time to first byte subpart:timeToFirstByte] map[duration:1040.62 label:Resource load delay subpart:resourceLoadDelay] map[duration:330.432 label:Resource load duration subpart:resourceLoadDuration] map[duration:28.983 label:Element render delay subpart:elementRenderDelay]]

lhId: page-0-IMG

nodeLabel: home-compass-noteworthy

path: 1,HTML,1,BODY,4,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,A,0,PICTURE,0,IMG

selector: div.d-flex > a.image-container > picture.w-100 > img.m-auto

snippet: <img alt="home-compass-noteworthy" loading="lazy" width="800" height="600" decoding="async" data-nimg="1" class="m-auto mw-100 mh-100 img-fluid" style="color:transparent" src="https://www.astm.org/v3/assets/blt5eb0a2cb04534832/blt326d673700682450/68b…">

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-0-IMG

nodeLabel: home-compass-noteworthy

path: 1,HTML,1,BODY,4,MAIN,0,DIV,0,DIV,0,DIV,0,DIV,1,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,A,0,PICTURE,0,IMG

selector: div.d-flex > a.image-container > picture.w-100 > img.m-auto

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
use.typekit.net/bpp4kqc.css	1.1 KiB	757 ms
/p.css?s=1&k=bpp4kqc&ht=tk&f=39512.39513.39516.39517.3951...	172 B	751 ms

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
MA26-SN-latest `div.d-flex > a.image-container > picture.w-100 > img.m-auto`	/v3/assets/blt5eb0a2cb04534832/blt841e71b9e5139d3a/69a1e7...	55.4 KiB	47.3 KiB
home-compass-noteworthy `div.d-flex > a.image-container > picture.w-100 > img.m-auto`	/v3/assets/blt5eb0a2cb04534832/blt326d673700682450/68bf1b...	40.0 KiB	32.0 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: 844 ms

URL	Time Spent
astm.org/	844 ms
www.astm.org/	0.0 ms

Keep the server response time for the main document short because all other requests depend on it. Learn more about the Time to First Byte metric.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 1.5 s

URL	Time Spent
www.astm.org/	1.6 s

These are the largest layout shifts observed on the page. Each table item represents a single layout shift, and shows the element that shifted the most. Below each item are possible root causes that led to the layout shift. Some of these layout shifts may not be included in the CLS metric value due to windowing. Learn how to improve CLS

Why this matters

Performance issues directly impact user engagement and conversion rates.

Element	Layout shift score
New & Noteworthy Change With Accuris Agreement As of December 31, 2025, ASTM’s… `body.modal-open > main.container-xl`	0.177
Change With Accuris Agreement As of December 31, 2025, ASTM’s agreement with A… `div.position-relative > div.h-100 > div.d-flex > div.d-flex`	0.002
Search `body.modal-open > header.position-relative > div.container-xl > div.ms-auto`	0.001
Search `body.modal-open > header.position-relative > div.container-xl > div.ms-auto`	0.001

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 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 62.3 KiB

URL	Transfer Size	Est Savings
www.astm.org/_next/static/css/2e2b0d5f8f450d37.css	30.4 KiB	27.8 KiB
www.astm.org/_next/static/css/34711861f0d83b3b.css	23.7 KiB	23.0 KiB
www.astm.org/_next/static/css/f1571eea04d057cb.css	12.8 KiB	11.5 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: 1.9 s 435.9 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=G-YXS8H95P3G&cx=c&gtm=4e64k0h2	173.1 KiB	115.9 KiB
www.googletagmanager.com/gtag/destination?id=G-YXS8H95P3G&cx=c&gtm=4e64k0h2	173.1 KiB	70.7 KiB
www.astm.org/_next/static/chunks/7273-57e2012880982d18.js	108.1 KiB	67.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-54ZG9PKC	152.1 KiB	61.2 KiB
www.astm.org/_next/static/chunks/4245-89881a608d3d3b37.js	104.5 KiB	58.1 KiB
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	56.1 KiB	37.6 KiB
www.astm.org/_next/static/chunks/992-e94673434af1789a.js	57.6 KiB	25.3 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	1.9 s	67 ms	0.0 ms
www.astm.org/_next/static/chunks/webpack-955ea9e689c54099.js	807 ms	799 ms	0.5 ms
www.astm.org/_next/static/chunks/3131-221e6607f27d6926.js	678 ms	550 ms	44 ms
www.astm.org/	500 ms	31 ms	34 ms
www.googletagmanager.com/gtag/destination?id=G-YXS8H95P3G&cx=c&gtm=4e64k0h2	391 ms	338 ms	50 ms
www.googletagmanager.com/gtm.js?id=GTM-54ZG9PKC	375 ms	311 ms	50 ms
script.hotjar.com/modules.6a0f3932cb1341a35c18.js	299 ms	248 ms	19 ms
www.astm.org/_next/static/chunks/c7879cf7-fabe25011515220e.js	297 ms	172 ms	13 ms
www.astm.org/_next/static/chunks/992-e94673434af1789a.js	211 ms	123 ms	16 ms
www.googletagmanager.com/gtag/js?id=G-YXS8H95P3G&cx=c&gtm=4e64k0h2	81 ms	33 ms	48 ms
snap.licdn.com/li.lms-analytics/insight.min.js	73 ms	62 ms	8.2 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	2.9 s
Other	2.0 s
Script Parsing & Compilation	403 ms
Style & Layout	290 ms
Garbage Collection	195 ms
Rendering	99 ms
Parse HTML & CSS	91 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
Pages with cache-control:no-store header cannot enter back/forward cache.	Actionable
Pages whose main resource has cache-control:no-store cannot enter back/forward cache.	Not actionable
Back/forward cache is disabled because some JavaScript network request received resource with Cache-Control: no-store header.	Not actionable

Minifying JavaScript files can reduce payload sizes and script parse time. Learn how to minify JavaScript.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 2.0 KiB

URL	Transfer Size	Est Savings
marketing.astm.org/cdnr/forpci56/acton/bn/tracker/9652	8.2 KiB	2.0 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
/v3/assets/blt5eb0a2cb04534832/blt46961022f4903fdd/69e26e...	52.3 MiB
/v3/assets/blt5eb0a2cb04534832/blt5b3b521937bcc6dd/67b2e7...	260.8 KiB
/v3/assets/blt5eb0a2cb04534832/bltcdd3472809f7bad5/67b2e7...	230.3 KiB
/v3/assets/blt5eb0a2cb04534832/blt122d0b57a94b9898/67b2e7...	193.9 KiB
www.googletagmanager.com/gtag/destination?id=G-YXS8H95P3G&cx=c&gtm=4e64k0h2	173.5 KiB
www.googletagmanager.com/gtag/js?id=G-YXS8H95P3G&cx=c&gtm=4e64k0h2	173.1 KiB
www.astm.org/_next/static/media/fa-regular-400.c432bd7d.woff2	171.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-54ZG9PKC	152.5 KiB
www.astm.org/_next/static/media/fa-solid-900.1c1969ce.woff2	139.0 KiB
www.astm.org/_next/static/chunks/7273-57e2012880982d18.js	108.7 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
home-compass@2x `div.card > div.g-col-12 > picture.w-100 > img.rounded-1`	/v3/assets/blt5eb0a2cb04534832/bltcdd3472809f7bad5/67b2e7...

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

●Optimize DOM size

●Forced reflow

●Modern HTTP

●Optimize viewport for mobile

●Minify CSS

●User Timing marks and measures 8 user timings

●Avoid long main-thread tasks 11 long tasks found

●Network Requests

●Network Round Trip Times 180 ms

●Server Backend Latencies 160 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

○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

ARIA dialog elements without accessible names may prevent screen readers users from discerning the purpose of these elements. Learn how to make ARIA dialog elements more accessible.

Why this matters

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

Source: MDN Permissions-Policy

Failing Elements
Welcome to astm.org You're about to be directed to the ASTM in the America Lat… `body.modal-open > div > div > div.modal`

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

When a button doesn't have an accessible name, screen readers announce it as "button", making it unusable for users who rely on screen readers. Learn how to make buttons more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
header.position-relative > div.container-xl > div.ms-auto > button.d-md-none `header.position-relative > div.container-xl > div.ms-auto > button.d-md-none`
div.container-xl > div.ms-auto > div.headersignin_headerSignInContainer__JP_Ja > button.astm-btn `div.container-xl > div.ms-auto > div.headersignin_headerSignInContainer__JP_Ja > button.astm-btn`

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.

Contrast

Low-contrast text is difficult or impossible for many users to read. Learn how to provide sufficient color contrast.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Apr 16, 2026 `div.g-col-12 > a.p-3 > span.d-flex > p.mb-0`
Apr 14, 2026 `div.g-col-12 > a.p-3 > span.d-flex > p.mb-0`
Apr 14, 2026 `div.g-col-12 > a.p-3 > span.d-flex > p.mb-0`
Apr 13, 2026 `div.g-col-12 > a.p-3 > span.d-flex > p.mb-0`
Mar 30, 2026 `div.g-col-12 > a.p-3 > span.d-flex > p.mb-0`
Mar 27, 2026 `div.g-col-12 > a.p-3 > span.d-flex > p.mb-0`

Low-contrast text is difficult or impossible for many users to read. Link text that is discernible improves the experience for users with low vision. Learn how to make links distinguishable.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
Spanish `div.d-flex > div.d-flex > p > a`
Portuguese `div.d-flex > div.d-flex > p > a`
Japanese `div.d-flex > div.d-flex > p > a`
Chinese `div.d-flex > div.d-flex > p > a`
Korean `div.d-flex > div.d-flex > p > a`

These are opportunities to improve the legibility of your content.

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
Change With Accuris Agreement `div.h-100 > div.d-flex > div.d-flex > h6`
Standardization Impact Report `div.childfeaturecard_cardMain__AvKXo > div.childfeaturecard_cardBodyPadding__Qh97I > div.flex-grow-1 > h6.text-left`
Comprehensive Solutions for All Your QA/QC Needs `div.d-flex > div.w-50 > div.styles_contentText__bPJ6F > h6`
Industry Leading Live and OnDemand Training `div.d-flex > div.w-50 > div.styles_contentText__bPJ6F > h6`
Global ASTM Standards `div.childstatcard_cardMain__W1zs4 > div.childstatcard_cardBodyPadding__SwNXF > div.text-muted > h6.text-left`
MoU Partner Countries `div.childstatcard_cardMain__W1zs4 > div.childstatcard_cardBodyPadding__SwNXF > div.text-muted > h6.text-left`
Volunteer Members `div.childstatcard_cardMain__W1zs4 > div.childstatcard_cardBodyPadding__SwNXF > div.text-muted > h6.text-left`
New Suite of Supply Chain Standards `div.grid > div.g-col-12 > a.p-3 > h6.styles_contentHeading__Maf1F`

These are opportunities to improve keyboard navigation in your application.

Visible text labels that do not match the accessible name can result in a confusing experience for screen reader users. Learn more about accessible names.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
New Suite of Supply Chain Standards The new standards support goods movement pr… `div.d-flex > div.grid > div.g-col-12 > a.p-3`
3 Standards for PFAS Measurement PFAS remediation and measurement promises to b… `div.d-flex > div.grid > div.g-col-12 > a.p-3`
Podcast: Standards on Tap Members of the committee on sensory evaluation have a… `div.d-flex > div.grid > div.g-col-12 > a.p-3`
New Sample Procedure for Air Quality The new standard will help protect workers… `div.d-flex > div.grid > div.g-col-12 > a.p-3`
Shower Chair Standard Proposed Participation is sought on the proposed standard… `div.d-flex > div.grid > div.g-col-12 > a.p-3`
Proposed Urban Heat Standard Participation is sought for the proposed standard,… `div.d-flex > div.grid > div.g-col-12 > a.p-3`

○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

●Document has a `<title>` element

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

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

●Links have a discernible name

●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

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

●Identical links have the same purpose.

○`[accesskey]` values are unique

○`button`, `link`, and `menuitem` elements 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.

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

○Form elements have associated labels

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

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

○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

○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.

○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

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.	www.astm.org/_next/static/chunks/7273-57e2012880982d18.js line 1421, col 28888
AttributionReporting	snap.licdn.com/li.lms-analytics/insight.min.js

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
iam.astm.org/api/v1/sessions/me	`Failed to load resource: the server responded with a status of 404 ()`

●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

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

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

●Ensure CSP is effective against XSS attacks

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Page has valid source maps

○Redirects HTTP traffic to HTTPS

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

○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

Descriptive link text helps search engines understand your content. Learn how to make links more accessible.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Link destination	Link Text
www.astm.org/news/press-releases/astm-expands-compass-access	Learn more
www.astm.org/news/a-standard-approach-to-enterprise-risk-management	Learn more
regional.astm.org/	Learn More
www.astm.org/standards-and-solutions/bos	Learn More
asmedigitalcollection.asme.org/astm	Learn More
www.astm.org/standards-and-solutions/enterprise-solutions	Learn More
www.astm.org/standards-and-solutions/enterprise-solutions/other-publishers	Learn More
/standards-and-solutions/market-insights-and-innovation/m...	Learn More
astmxcellerate.com/	Learn More
www.astm.org/standards-and-solutions/market-insights-and-innovation/innovation	Learn More
wohlersassociates.com/reports/	Learn More

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

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`