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Lighthouse Mobile

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

Audit breakdown by category with detailed findings.

54

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.

RequestCache TTLTransfer Size
d33xdlntwy0kbs.cloudfront.net/cshl_custom_medrxiv.js0.0 ms80.4 KiB
d33xdlntwy0kbs.cloudfront.net/cshl_custom_medrxiv.css0.0 ms41.7 KiB
www.medrxiv.org/cdn-cgi/challenge-platform/h/b/scripts/jsd/0b8fb825cb67/main.js?14400.0 s14.2 KiB
/sites/all/themes/highwire/jcore_1/font/fontawesome-webfo...1209600.0 s43.2 KiB
www.medrxiv.org/sites/default/files/medRxiv_homepage_logo.png1209600.0 s31.2 KiB
script.crazyegg.com/pages/scripts/0056/6375.js300.0 s2.7 KiB
rum-static.pingdom.net/prum.min.js43200.0 s2.8 KiB
www.medrxiv.org/sites/default/files/medrxiv_inner_logo.png1209600.0 s11.4 KiB
img.icons8.com/color/16/000000/google-logo.png302400.0 s998 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:0.329511] map[node:map[boundingRect:map[bottom:2550 height:2427 left:0 right:412 top:123 width:412] lhId:page-1-SECTION nodeLabel:Search for this keyword Advanced Search Caution: Preprints are preliminary … path:1,HTML,1,BODY,6,DIV,1,SECTION selector:body.html > div#page > section#section-content snippet:<section id="section-content" class="section section-content"> type:node] score:0.239806 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:260 height:117 left:10 right:402 top:143 width:392] lhId:page-7-IMG nodeLabel:div.panel-pane > div.pane-content > div.blood_logo > img path:1,HTML,1,BODY,6,DIV,1,SECTION,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG selector:div.panel-pane > div.pane-content > div.blood_logo > img snippet:<img src="sites/default/files/medRxiv_homepage_logo.png"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:2219 height:1650 left:10 right:402 top:569 width:392] lhId:page-2-DIV nodeLabel:Subject Areas All Articles Addiction Medicine Allergy and Immunology Anesthesia… path:1,HTML,1,BODY,6,DIV,1,SECTION,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,7,DIV selector:div.panel-display > div.panel-panel > div > div.panel-pane snippet:<div class="panel-pane pane-panels-mini pane-biorxiv-subject-areas-table block-style-h…"> type:node] score:0.085166 subItems:map[items:[map[cause:Unsized image element extra:map[boundingRect:map[bottom:260 height:117 left:10 right:402 top:143 width:392] lhId:page-7-IMG nodeLabel:div.panel-pane > div.pane-content > div.blood_logo > img path:1,HTML,1,BODY,6,DIV,1,SECTION,0,DIV,0,DIV,0,DIV,1,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,DIV,0,IMG selector:div.panel-pane > div.pane-content > div.blood_logo > img snippet:<img src="sites/default/files/medRxiv_homepage_logo.png"> type:node]]] type:subitems]] map[node:map[boundingRect:map[bottom:823 height:115 left:0 right:412 top:708 width:412] lhId:page-6-DIV nodeLabel:We use cookies on this site to enhance your user experience. By clicking any li… path:1,HTML,1,BODY,15,DIV selector:body.html > div#sliding-popup snippet:<div id="sliding-popup" class="sliding-popup-bottom" style="height: auto; width: 100%; bottom: 0px;"> type:node] score:0.000596] map[node:map[boundingRect:map[bottom:823 height:115 left:0 right:412 top:708 width:412] lhId:page-6-DIV nodeLabel:We use cookies on this site to enhance your user experience. By clicking any li… path:1,HTML,1,BODY,15,DIV selector:body.html > div#sliding-popup snippet:<div id="sliding-popup" class="sliding-popup-bottom" style="height: auto; width: 100%; bottom: 0px;"> type:node] score:0.000543] map[node:map[boundingRect:map[bottom:823 height:115 left:0 right:412 top:708 width:412] lhId:page-6-DIV nodeLabel:We use cookies on this site to enhance your user experience. By clicking any li… path:1,HTML,1,BODY,15,DIV selector:body.html > div#sliding-popup snippet:<div id="sliding-popup" class="sliding-popup-bottom" style="height: auto; width: 100%; bottom: 0px;"> type:node] score:0.000539]]

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.

URLEst Savings
/sites/all/themes/highwire/jcore_1/font/fontawesome-webfo...65 ms

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

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.

URLTransfer SizeDuration
/sites/default/files/advagg_js/js__pLr-NK78ay59QifmKNmtsl...59.2 KiB602 ms
d33xdlntwy0kbs.cloudfront.net/cshl_custom_medrxiv.css41.7 KiB1.2 s
cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.7.2/css/all.min.css22.1 KiB1.1 s
/sites/default/files/advagg_css/css__vP96nkAt3EeLU62QRdHX...18.9 KiB151 ms
/sites/default/files/advagg_css/css__Emt7SSsxOn34QjMVwnu4...9.1 KiB151 ms
/sites/default/files/advagg_css/css__2WBMox6sOrN42ss5lCnH...13.0 KiB301 ms
/sites/default/files/advagg_css/css__oMKaN562ROZEhY5bedOf...2.2 KiB
/sites/default/files/advagg_css/css__HZ-qMUtEfy3t2_CcrU8X...10.4 KiB301 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.

URLResource SizeEst Savings
div.panel-pane > div.pane-content > div.blood_logo > img div.panel-pane > div.pane-content > div.blood_logo > img
www.medrxiv.org/sites/default/files/medRxiv_homepage_logo.png30.7 KiB15.6 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: 969 ms
URLTime Spent
medrxiv.org/969 ms
www.medrxiv.org/0.0 ms

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.

ElementLayout shift score
Search for this keyword Advanced Search Caution: Preprints are preliminary … body.html > div#page > section#section-content
0.240
Subject Areas All Articles Addiction Medicine Allergy and Immunology Anesthesia… div.panel-display > div.panel-panel > div > div.panel-pane
0.085
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.001
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.001
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.001
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000
We use cookies on this site to enhance your user experience. By clicking any li… body.html > div#sliding-popup
0.000

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: 340 ms 90.7 KiB
URLTransfer SizeEst Savings
d33xdlntwy0kbs.cloudfront.net/cshl_custom_medrxiv.css41.2 KiB39.6 KiB
cdn.jsdelivr.net/npm/@fortawesome/fontawesome-free@6.7.2/css/all.min.css21.7 KiB21.6 KiB
/sites/default/files/advagg_css/css__vP96nkAt3EeLU62QRdHX...18.6 KiB16.8 KiB
/sites/default/files/advagg_css/css__2WBMox6sOrN42ss5lCnH...12.7 KiB12.7 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: 450 ms 232.5 KiB
URLTransfer SizeEst Savings
www.googletagmanager.com/gtm.js?id=GTM-P4HH5NV113.1 KiB66.2 KiB
www.googletagmanager.com/gtag/js?id=G-0K57TCX5BY143.6 KiB62.9 KiB
d33xdlntwy0kbs.cloudfront.net/cshl_custom_medrxiv.js79.9 KiB52.6 KiB
/pages/versioned/common-scripts/4ce8c7df8d425cc5046457682...55.1 KiB29.3 KiB
/sites/default/files/advagg_js/js__pLr-NK78ay59QifmKNmtsl...58.8 KiB21.5 KiB

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

Why this matters

Performance issues directly impact user engagement and conversion rates.

Estimated savings: 0.0 ms 13.1 KiB
URLTransfer SizeEst Savings
d33xdlntwy0kbs.cloudfront.net/cshl_custom_medrxiv.css41.7 KiB13.1 KiB

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 11.8 KiB
URLTransfer SizeEst Savings
/sites/default/files/advagg_js/js__pLr-NK78ay59QifmKNmtsl...58.8 KiB11.8 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
div.panel-pane > div.pane-content > div.blood_logo > img div.panel-pane > div.pane-content > div.blood_logo > img
www.medrxiv.org/sites/default/files/medRxiv_homepage_logo.png

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

●Max Potential First Input Delay 120 ms
●Optimize DOM size
●Forced reflow
●LCP breakdown
●Modern HTTP
●Optimize viewport for mobile
●Avoids enormous network payloads Total size was 704 KiB
●User Timing marks and measures 5 user timings
●JavaScript execution time 1.1 s
●Minimizes main-thread work 1.7 s
●Avoid long main-thread tasks 8 long tasks found
●Page didn't prevent back/forward cache restoration
●Network Requests
●Network Round Trip Times 40 ms
●Server Backend Latencies 510 ms
●Tasks
●Diagnostics
●Metrics
●Screenshot Thumbnails
●Final Screenshot
●Script Treemap Data
●Resources Summary
●Initial server response time was short Root document took 330 ms
○INP breakdown
○LCP request discovery
○Avoid non-composited animations
88

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.

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
Continue div > div.popup-content > div#popup-buttons > button.agree-button
Find out more div > div.popup-content > div#popup-buttons > button.find-more-button

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.panel-pane > div.pane-content > div.blood_logo > img div.panel-pane > div.pane-content > div.blood_logo > img

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
SUBMIT nav.menubar-nav > ul.menu > li.leaf > a
FAQ nav.menubar-nav > ul.menu > li.leaf > a
BLOG nav.menubar-nav > ul.menu > li#cshl_news > a
ALERTS / RSS nav.menubar-nav > ul.menu > li.last > a
RESOURCES nav.menubar-nav > ul.menu > li.leaf > a
ABOUT nav.menubar-nav > ul.menu > li.leaf > a
Advanced Search div.panel-pane > div.pane-content > p.homepage-advanced-search > a
Caution: Preprints are preliminary reports of work that have not been certified… div.panel-display > div.panel-panel > div > div#cshl_msg
All Articles div#biorxiv-subject-areas-view-papers > div.snippet-content > a > strong
Addiction Medicine li.views-row > div.views-field > span.field-content > a
Allergy and Immunology li.views-row > div.views-field > span.field-content > a
Anesthesia li.views-row > div.views-field > span.field-content > a
Cardiovascular Medicine li.views-row > div.views-field > span.field-content > a
Dentistry and Oral Medicine li.views-row > div.views-field > span.field-content > a
Dermatology li.views-row > div.views-field > span.field-content > a
Emergency Medicine li.views-row > div.views-field > span.field-content > a
Endocrinology (including Diabetes Mellitus and Metabolic Disease) li.views-row > div.views-field > span.field-content > a
Epidemiology li.views-row > div.views-field > span.field-content > a
Forensic Medicine li.views-row > div.views-field > span.field-content > a
Gastroenterology li.views-row > div.views-field > span.field-content > a
Genetic and Genomic Medicine li.views-row > div.views-field > span.field-content > a
Geriatric Medicine li.views-row > div.views-field > span.field-content > a
Health Economics li.views-row > div.views-field > span.field-content > a
Health Informatics li.views-row > div.views-field > span.field-content > a
Health Policy li.views-row > div.views-field > span.field-content > a
Health Systems and Quality Improvement li.views-row > div.views-field > span.field-content > a
Hematology li.views-row > div.views-field > span.field-content > a
HIV/AIDS li.views-row > div.views-field > span.field-content > a
Infectious Diseases (except HIV/AIDS) li.views-row > div.views-field > span.field-content > a
Intensive Care and Critical Care Medicine li.views-row > div.views-field > span.field-content > a
Medical Education li.views-row > div.views-field > span.field-content > a
Medical Ethics li.views-row > div.views-field > span.field-content > a
Nephrology li.views-row > div.views-field > span.field-content > a
Neurology li.views-row > div.views-field > span.field-content > a
Nursing li.views-row > div.views-field > span.field-content > a
Nutrition li.views-row > div.views-field > span.field-content > a
Obstetrics and Gynecology li.views-row > div.views-field > span.field-content > a
Occupational and Environmental Health li.views-row > div.views-field > span.field-content > a
Oncology li.views-row > div.views-field > span.field-content > a
Ophthalmology li.views-row > div.views-field > span.field-content > a
Orthopedics li.views-row > div.views-field > span.field-content > a
Otolaryngology li.views-row > div.views-field > span.field-content > a
Pain Medicine li.views-row > div.views-field > span.field-content > a
Palliative Medicine li.views-row > div.views-field > span.field-content > a
Pathology li.views-row > div.views-field > span.field-content > a
Pediatrics li.views-row > div.views-field > span.field-content > a
Pharmacology and Therapeutics li.views-row > div.views-field > span.field-content > a
Primary Care Research li.views-row > div.views-field > span.field-content > a
Psychiatry and Clinical Psychology li.views-row > div.views-field > span.field-content > a
Public and Global Health li.views-row > div.views-field > span.field-content > a
Radiology and Imaging li.views-row > div.views-field > span.field-content > a
Rehabilitation Medicine and Physical Therapy li.views-row > div.views-field > span.field-content > a
Respiratory Medicine li.views-row > div.views-field > span.field-content > a
Rheumatology li.views-row > div.views-field > span.field-content > a
Sexual and Reproductive Health li.views-row > div.views-field > span.field-content > a
Sports Medicine li.views-row > div.views-field > span.field-content > a
Surgery li.views-row > div.views-field > span.field-content > a
Toxicology li.views-row > div.views-field > span.field-content > a
Transplantation li.views-row > div.views-field > span.field-content > a
Urology li.views-row > div.views-field > span.field-content > a
View by Month div.pane-content > div.view > div.view-footer > a.view-by-month-link
The Chan Zuckerberg Initiative, Cold Spring Harbor Laboratory, the Sergey Brin … div#mini-panel-biorxiv_subject_areas_table > div.panel-panel > div#czilogo > blockquote.cshl_thanks
Find out more div > div.popup-content > div#popup-buttons > button.find-more-button

These are opportunities to improve the legibility of your content.

○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
●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
●`[role]` values are valid
●`[aria-*]` attributes have valid values
●`[aria-*]` attributes are valid and not misspelled
●Input buttons have discernible text.
●Form elements have associated labels
●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.
●`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
●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
●Lists contain only `<li>` elements and script supporting elements (`<script>` and `<template>`).
●List items (`<li>`) are contained within `<ul>`, `<ol>` or `<menu>` parent elements
●Touch targets have sufficient size and spacing.
●Document has a main landmark.
●Deprecated ARIA roles were not used
●Uses ARIA roles only on compatible elements
○`[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
○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
○Heading elements appear in a sequentially-descending order
○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.
○`<input type="image">` elements have `[alt]` text
○Links are distinguishable without relying on color.
○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.
○Image elements do not have `[alt]` attributes that are redundant text.
○Identical links have the same purpose.
○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.
81

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 / WarningSource
SharedStorage
www.medrxiv.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
StorageType.persistent is deprecated. Please use standardized navigator.storage instead.
www.medrxiv.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
Fledge
www.medrxiv.org/cdn-cgi/challenge-platform/scripts/jsd/main.js
●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 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
92

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

Informative elements should aim for short, descriptive alternate text. Decorative elements can be ignored with an empty alt attribute. Learn more about the `alt` attribute.

Why this matters

Performance issues directly impact user engagement and conversion rates.

Failing Elements
div.panel-pane > div.pane-content > div.blood_logo > img div.panel-pane > div.pane-content > div.blood_logo > img

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 have descriptive text
●Links are crawlable
●robots.txt is valid
●Document has a valid `hreflang`
●Document has a valid `rel=canonical`

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