C — https://www.harvard.edu | BeaverCheck Audit

Site Health

Score: 77 / 100

Based on 8 categories, 0 sections

How is this calculated?

The overall score is a weighted average of individual category scores. Categories with more impact on user experience and security carry more weight.

Performance 25%Security 25%Accessibility 15%SEO 10%Infrastructure 10%Compliance 8%Content 5%Sustainability 2%

Weights reflect general web best practices. Individual needs may differ.

Top Priorities (5)

Content-Security-Policy header is missing

Security › Security Headers

HSTS header is missing

Security › Security Headers

No Content-Security-Policy header found

Security › Content Security Policy

is missing width/height — may cause layout shift

Performance › Image Optimization

Cross-Origin-Embedder-Policy header is missing

Security › Security Headers

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fwww.harvard.edu)](https://beavercheck.com/results/5e19c770-b7a3-8049-3485-dc2beb000b14)

HTML

<a href="https://beavercheck.com/results/5e19c770-b7a3-8049-3485-dc2beb000b14"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fwww.harvard.edu" alt="BeaverCheck Score"></a>

Image URL

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Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

Accessibility

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.52 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

11.51 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

634 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.008

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

2.22 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

14.14 s

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.

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

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

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.

URL	Est Savings
/wp-content/themes/core/assets/fonts/theme/canela/CanelaD...	45 ms
/wp-content/themes/core/assets/fonts/theme/gt-america/GT-...	40 ms
/wp-content/themes/core/assets/fonts/theme/icons-core/cor...	40 ms
/wp-content/themes/core/assets/fonts/theme/gt-america/GT-...	35 ms
/wp-content/themes/core/assets/fonts/theme/gt-america/GT-...	35 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.

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

items: [map[reflowTime:77.119 source:map[type:text value:[unattributed]]]]

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

	URL	Resource Size	Est Savings
A person walking in the woods `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_191602076.jpg	1.2 MiB	1.2 MiB
A person walking in the woods `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_472177351.jpg	434.8 KiB	433.5 KiB
A person eating an orange `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_101812456.jpg	240.2 KiB	238.9 KiB
Close up of brain neurons `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-circavent.jpg...	33.8 KiB	31.9 KiB
Patient speaking with a doctor `div.b-news__left > div.b-news__first > figure.b-news__first-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-doc-check-in....	20.3 KiB	15.4 KiB
Photo of Paola Arlotta `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-paola-arlotta...	16.2 KiB	14.4 KiB

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

lhId: page-6-DIV

nodeLabel: Two people reaching out and holding hands

path: 1,HTML,1,BODY,4,DIV,2,MAIN,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV

selector: div.b-hero__container > div.b-hero__media > div.b-hero__figure > div.b-hero__img

snippet: <div class="b-hero__img c-image__image lazyloaded" role="img" aria-label="Two people reaching out and holding hands" data-expand="200" data-bgset="https://www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_452869299.jp…" style="background-image: url("https://www.harvard.edu/wp-content/uploads/2026/03/…");">

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.

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.

URL	Transfer Size	Duration
/wp-content/themes/core/assets/css/dist/theme/master.min....	90.2 KiB	601 ms
/_static/??-eJyVjFsKgCAQAC+UbtLDr+gsYhstqCvuQtfPjzpAfwPDD...	5.7 KiB

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

Request	Cache TTL	Transfer Size
connect.facebook.net/en_US/fbevents.js	1200.0 s	95.0 KiB
/signals/config/116026588849778?v=2.9.291&r=stable&domain...	1200.0 s	39.8 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
cse.google.com/cse.js?cx=006776768860476326824:n4rl30fjc-e	0.0 ms	3.6 KiB
www.google.com/cse/static/style/look/v6/default.css	3000.0 s	1.2 KiB
/tr/?id=116026588849778&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	19 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.

TTI

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.

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.

Estimated savings: 300 ms 75.6 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/core/assets/css/dist/theme/master.min....	90.0 KiB	75.6 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.

Estimated savings: 900 ms 404.1 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/core/assets/js/dist/theme/vendor.min.j...	160.4 KiB	137.9 KiB
www.googletagmanager.com/gtm.js?id=GTM-5SGSF6G	142.0 KiB	63.5 KiB
www.googletagmanager.com/gtag/js?id=G-KBLBYHG5EP&cx=c&gtm=4e6460	152.5 KiB	63.1 KiB
/cse/static/element/b33cba5881f68fbf/cse_element__en.js?u...	98.5 KiB	49.3 KiB
connect.facebook.net/en_US/fbevents.js	94.8 KiB	36.2 KiB
cse.google.com/adsense/search/async-ads.js	43.3 KiB	31.5 KiB
www.harvard.edu/wp-content/themes/core/assets/js/vendor/jquery.min.js?ver=3.4.1	30.7 KiB	22.7 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.

URL	Total CPU Time	Script Evaluation	Script Parse
www.harvard.edu/	1.4 s	18 ms	8.7 ms
Unattributable	589 ms	107 ms	0.0 ms
www.googletagmanager.com/gtm.js?id=GTM-5SGSF6G	323 ms	250 ms	60 ms
www.googletagmanager.com/gtag/js?id=G-KBLBYHG5EP&cx=c&gtm=4e6460	259 ms	192 ms	63 ms
/wp-content/themes/core/assets/js/dist/theme/scripts.min....	233 ms	197 ms	22 ms
/wp-content/themes/core/assets/js/dist/theme/vendor.min.j...	215 ms	58 ms	70 ms
connect.facebook.net/en_US/fbevents.js	183 ms	135 ms	47 ms
cse.google.com/cse.js?cx=006776768860476326824:n4rl30fjc-e	142 ms	106 ms	1.5 ms
/signals/config/116026588849778?v=2.9.291&r=stable&domain...	136 ms	111 ms	24 ms
www.google-analytics.com/analytics.js	83 ms	64 ms	7.0 ms
cdn.parsely.com/keys/harvard.edu/p.js?ver=3.21.2	82 ms	71 ms	7.1 ms
/cse/static/element/b33cba5881f68fbf/cse_element__en.js?u...	81 ms	32 ms	46 ms
www.harvard.edu/wp-content/themes/core/assets/js/vendor/jquery.min.js?ver=3.4.1	75 ms	40 ms	33 ms
/wp-content/themes/core/assets/css/dist/theme/master.min....	63 ms	0.0 ms	0.0 ms
cse.google.com/adsense/search/async-ads.js	53 ms	32 ms	17 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

Category	Time Spent
Script Evaluation	1.5 s
Other	960 ms
Style & Layout	881 ms
Script Parsing & Compilation	417 ms
Parse HTML & CSS	148 ms
Rendering	107 ms
Garbage Collection	24 ms

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

Estimated savings: 0.0 ms 2.8 KiB

URL	Transfer Size	Est Savings
www.google.com/cse/static/element/b33cba5881f68fbf/default_v6+en.css	9.7 KiB	2.8 KiB

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

URL	Transfer Size
www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_191602076.jpg	1.2 MiB
www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_472177351.jpg	435.6 KiB
www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_101812456.jpg	240.8 KiB
/wp-content/themes/core/assets/js/dist/theme/vendor.min.j...	160.7 KiB
www.googletagmanager.com/gtag/js?id=G-KBLBYHG5EP&cx=c&gtm=4e6460	152.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-5SGSF6G	142.3 KiB
/cse/static/element/b33cba5881f68fbf/cse_element__en.js?u...	98.5 KiB
connect.facebook.net/en_US/fbevents.js	95.0 KiB
/wp-content/themes/core/assets/css/dist/theme/master.min....	90.2 KiB
/wp-content/uploads/2026/03/sq-featured-mallory-hacket.jp...	83.5 KiB

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

	URL
A person walking in the woods `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_472177351.jpg
A person eating an orange `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_101812456.jpg
A person walking in the woods `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_191602076.jpg
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/sq-featured-wellbeing.jpg?w=6...
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/sq-featured-art.jpg?w=624&h=6...
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/sq-featured-ES96-team.jpg?w=6...
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/AdobeStock_701912080.jpg?w=62...
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	www.harvard.edu/wp-content/uploads/2026/03/RSL-Banner.jpg?w=624&h=624&crop=1
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/sq-featured-mallory-hacket.jp...
Instagram `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/Instagram-1.png
TikTok `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/tiktok-1.png
LinkedIn `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/Linkedin-1.png
Facebook `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/FB3.png
YouTube `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/youtube-1.png
A text exchange where someone is asking of the other person is ok `div.b-media-text__media > div.b-media-text__img-wrap > figure.c-image > img.c-image__image`	www.harvard.edu/wp-content/themes/core/assets/img/theme/shims/four-three.png
Harvard University `div.site-footer__row > div.site-footer__logo > a > img`	/wp-content/themes/core/assets/img/theme/branding-assets/...
Patient speaking with a doctor `div.b-news__left > div.b-news__first > figure.b-news__first-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-doc-check-in....
An illustration of a working tired but still working `div.b-news__left > div.b-news__first > figure.b-news__first-img > img.c-image__image`	/wp-content/uploads/2026/03/iStock-1354056768.avif?w=736&...
Photo of Paola Arlotta `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-paola-arlotta...
Close up of brain neurons `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-circavent.jpg...
Photo of Matthew Nock and Jordan Smoller `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-nock-smoller....
An illustration of a double helix and a human brain `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-psych-disorde...
A woman wearing a transcranial magnetic stimulation (TMS) device `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-tms.jpg?w=375...
div.s-sink > section.c-block > figure.c-image > img.c-image__image `div.s-sink > section.c-block > figure.c-image > img.c-image__image`

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

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●User Timing marks and measures 5 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 120 ms

●Server Backend Latencies 130 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 0 ms

●Avoid large layout shifts 1 layout shift 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.

Contrast

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

Failing Elements
Walk `ul.b-stats__list > li.b-stats__list-item > div.c-statistic > div.c-statistic__value`
Studies show that spending time in natural environments can lower biomarkers f… `li.b-stats__list-item > div.c-statistic > div.c-statistic__label > p`
lower biomarkers for stress and reduce cycles of negative thoughts `div.c-statistic > div.c-statistic__label > p > a`
Eat `ul.b-stats__list > li.b-stats__list-item > div.c-statistic > div.c-statistic__value`
Eating an orange a day may lower a person’s depression risk by 20%, according … `li.b-stats__list-item > div.c-statistic > div.c-statistic__label > p`
lower a person’s depression risk by 20% `div.c-statistic > div.c-statistic__label > p > a`
Breathe `ul.b-stats__list > li.b-stats__list-item > div.c-statistic > div.c-statistic__value`
The kids aren’t alright `div.b-media-text__container > div.b-media-text__content > div.c-block__content-block > h3.c-block__title`
Support at the theater `div.c-slider--carousel-pull-right__slide > div.b-featured-stories__wrapper > div.b-featured-stories__slide-content > h3.b-featured-stories__slide-title`
Harvard's American Repertory Theater worked with a Harvard-trained psychologist… `div.c-slider--carousel-pull-right__slide > div.b-featured-stories__wrapper > div.b-featured-stories__slide-content > div.b-featured-stories__slide-desc`
YOU MAY ALSO LIKE `div.l-container > div.b-link-list__left-col > header.c-block__content-block > p.c-block__leadin`
Related In Focus topics `div.l-container > div.b-link-list__left-col > header.c-block__content-block > h2.c-block__title`

These are opportunities to improve the legibility of your content.

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.

Failing Elements
Learn more about the study `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d55e95882f6-link`
Learn more about the research `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d55e9588363-link`
Learn more about the connection `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d55e9588391-link`
Read more about their tips for happiness `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d55e958bde4-link`
Learn more about their book `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d55e958be21-link`
Read more about Jennifer’s book `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d55e958be43-link`

○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

●`[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 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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

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

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

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

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

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

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

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

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

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

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

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

○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.

Deprecation / Warning	Source
AttributionReporting	connect.facebook.net/en_US/fbevents.js line 273, col 769

Source maps translate minified code to the original source code. This helps developers debug in production. In addition, Lighthouse is able to provide further insights. Consider deploying source maps to take advantage of these benefits. Learn more about source maps.

URL
/wp-content/themes/core/assets/js/dist/theme/vendor.min.j...

●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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

100

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.

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

Best Practices

100

SEO

Core Web Vitals

Key metrics that affect user experience. — Desktop

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

503 ms

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.39 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

6 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.001

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

914 ms

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.72 s

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.

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

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.

URL	Est Savings
/wp-content/themes/core/assets/fonts/theme/icons-core/cor...	35 ms
/wp-content/themes/core/assets/fonts/theme/gt-america/GT-...	35 ms
/wp-content/themes/core/assets/fonts/theme/canela/CanelaD...	35 ms
/wp-content/themes/core/assets/fonts/theme/gt-america/GT-...	35 ms
/wp-content/themes/core/assets/fonts/theme/gt-america/GT-...	25 ms

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:3.493 source:map[column:11177 line:1 type:source-location url:https://www.harvard.edu/wp-content/themes/core/assets/js/dist/theme/scripts.min.js?ver=e96cd733acfdfb3909cc0cb04a087f664206a8de87a4155863efaff221e67dd0693af3ebb48029ad20da849db0c2541451694c11732de2a206c55360f5ed5218 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:140.838 source:map[type:text value:[unattributed]]] map[reflowTime:0.152 source:map[column:389872 line:0 type:source-location url:https://www.harvard.edu/wp-content/themes/core/assets/js/dist/theme/vendor.min.js?ver=5b4e48cf0fbd9ab8d8f2c32ec81b6cf96e8c138e7bde68035416aad021a85c7d15959b77e4103dbacc48c75561d99a307a31ef22b69513c11e9d57a52dd9594c urlProvider:network]] map[reflowTime:3.341 source:map[column:460548 line:0 type:source-location url:https://www.harvard.edu/wp-content/themes/core/assets/js/dist/theme/vendor.min.js?ver=5b4e48cf0fbd9ab8d8f2c32ec81b6cf96e8c138e7bde68035416aad021a85c7d15959b77e4103dbacc48c75561d99a307a31ef22b69513c11e9d57a52dd9594c urlProvider:network]]]

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

lhId: page-0-DIV

nodeLabel: Two people reaching out and holding hands

path: 1,HTML,1,BODY,4,DIV,2,MAIN,1,DIV,0,SECTION,0,DIV,0,DIV,0,DIV,0,DIV

selector: div.b-hero__container > div.b-hero__media > div.b-hero__figure > div.b-hero__img

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.

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.

URL	Transfer Size	Duration
/wp-content/themes/core/assets/css/dist/theme/master.min....	90.2 KiB	80 ms
/_static/??-eJyVjFsKgCAQAC+UbtLDr+gsYhstqCvuQtfPjzpAfwPDD...	5.7 KiB

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

Request	Cache TTL	Transfer Size
connect.facebook.net/en_US/fbevents.js	1200.0 s	95.0 KiB
/signals/config/116026588849778?v=2.9.291&r=stable&domain...	1200.0 s	39.8 KiB
www.google-analytics.com/analytics.js	7200.0 s	20.9 KiB
cse.google.com/cse.js?cx=006776768860476326824:n4rl30fjc-e	0.0 ms	3.9 KiB
www.google.com/cse/static/style/look/v6/default.css	3000.0 s	1.2 KiB
/tr/?id=116026588849778&ev=PageView&dl=https%3A%2F%2Fwww....	0.0 ms	19 B

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

	URL	Resource Size	Est Savings
A person walking in the woods `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_191602076.jpg	1.2 MiB	1.2 MiB
A person walking in the woods `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_472177351.jpg	434.8 KiB	433.5 KiB
A person eating an orange `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_101812456.jpg	240.2 KiB	238.9 KiB
Close up of brain neurons `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-circavent.jpg...	33.8 KiB	31.9 KiB
Photo of Paola Arlotta `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-paola-arlotta...	16.2 KiB	14.4 KiB

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.

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.

Estimated savings: 40 ms 73.6 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/core/assets/css/dist/theme/master.min....	90.0 KiB	73.6 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.

Estimated savings: 200 ms 405.1 KiB

URL	Transfer Size	Est Savings
/wp-content/themes/core/assets/js/dist/theme/vendor.min.j...	160.4 KiB	137.9 KiB
www.googletagmanager.com/gtag/js?id=G-KBLBYHG5EP&cx=c&gtm=4e6460h1	152.5 KiB	63.7 KiB
www.googletagmanager.com/gtm.js?id=GTM-5SGSF6G	142.0 KiB	63.5 KiB
/cse/static/element/b33cba5881f68fbf/cse_element__en.js?u...	98.5 KiB	49.4 KiB
connect.facebook.net/en_US/fbevents.js	94.8 KiB	36.5 KiB
cse.google.com/adsense/search/async-ads.js	43.3 KiB	31.5 KiB
www.harvard.edu/wp-content/themes/core/assets/js/vendor/jquery.min.js?ver=3.4.1	30.7 KiB	22.7 KiB

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

Estimated savings: 0.0 ms 2.8 KiB

URL	Transfer Size	Est Savings
www.google.com/cse/static/element/b33cba5881f68fbf/default_v6+en.css	9.7 KiB	2.8 KiB

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

URL	Transfer Size
www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_191602076.jpg	1.2 MiB
www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_472177351.jpg	435.6 KiB
www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_101812456.jpg	240.8 KiB
/wp-content/themes/core/assets/js/dist/theme/vendor.min.j...	160.7 KiB
www.googletagmanager.com/gtag/js?id=G-KBLBYHG5EP&cx=c&gtm=4e6460h1	152.6 KiB
www.googletagmanager.com/gtm.js?id=GTM-5SGSF6G	142.3 KiB
/cse/static/element/b33cba5881f68fbf/cse_element__en.js?u...	98.5 KiB
connect.facebook.net/en_US/fbevents.js	95.0 KiB
/wp-content/themes/core/assets/css/dist/theme/master.min....	90.2 KiB
/wp-content/uploads/2026/03/sq-featured-mallory-hacket.jp...	83.5 KiB

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

	URL
A person walking in the woods `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_472177351.jpg
A person eating an orange `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_101812456.jpg
A person walking in the woods `div.c-statistic > div.c-statistic__label > p > img`	www.harvard.edu/wp-content/uploads/2026/03/AdobeStock_191602076.jpg
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/sq-featured-wellbeing.jpg?w=6...
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/sq-featured-art.jpg?w=624&h=6...
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/sq-featured-ES96-team.jpg?w=6...
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/AdobeStock_701912080.jpg?w=62...
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	www.harvard.edu/wp-content/uploads/2026/03/RSL-Banner.jpg?w=624&h=624&crop=1
div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image `div.b-featured-stories__wrapper > div.b-featured-stories__img > figure.c-image > img.c-image__image`	/wp-content/uploads/2026/03/sq-featured-mallory-hacket.jp...
Patient speaking with a doctor `div.b-news__left > div.b-news__first > figure.b-news__first-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-doc-check-in....
An illustration of a working tired but still working `div.b-news__left > div.b-news__first > figure.b-news__first-img > img.c-image__image`	/wp-content/uploads/2026/03/iStock-1354056768.avif?w=736&...
A text exchange where someone is asking of the other person is ok `div.b-media-text__media > div.b-media-text__img-wrap > figure.c-image > img.c-image__image`	www.harvard.edu/wp-content/themes/core/assets/img/theme/shims/four-three.png
Instagram `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/Instagram-1.png
TikTok `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/tiktok-1.png
LinkedIn `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/Linkedin-1.png
Facebook `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/FB3.png
YouTube `ul.social-follow__list > li.social-follow__item > a.social-follow__anchor > img`	www.harvard.edu/wp-content/uploads/2023/11/youtube-1.png
Harvard University `div.site-footer__row > div.site-footer__logo > a > img`	/wp-content/themes/core/assets/img/theme/branding-assets/...
Photo of Paola Arlotta `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-paola-arlotta...
Close up of brain neurons `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-circavent.jpg...
Photo of Matthew Nock and Jordan Smoller `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-nock-smoller....
An illustration of a double helix and a human brain `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-psych-disorde...
A woman wearing a transcranial magnetic stimulation (TMS) device `div.b-news__right > div.b-news__side-wrap > figure.b-news__side-img > img.c-image__image`	/wp-content/uploads/2026/03/news-treatments-tms.jpg?w=375...
div.s-sink > section.c-block > figure.c-image > img.c-image__image `div.s-sink > section.c-block > figure.c-image > img.c-image__image`

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

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Max Potential First Input Delay 60 ms

●Minify JavaScript

●User Timing marks and measures 5 user timings

●JavaScript execution time 0.3 s

●Minimizes main-thread work 1.1 s

●Avoid long main-thread tasks 2 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 120 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 0 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○Avoid non-composited animations

Accessibility

Contrast

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

Failing Elements
Walk `ul.b-stats__list > li.b-stats__list-item > div.c-statistic > div.c-statistic__value`
Eat `ul.b-stats__list > li.b-stats__list-item > div.c-statistic > div.c-statistic__value`
Breathe `ul.b-stats__list > li.b-stats__list-item > div.c-statistic > div.c-statistic__value`
YOU MAY ALSO LIKE `div.l-container > div.b-link-list__left-col > header.c-block__content-block > p.c-block__leadin`
Related In Focus topics `div.l-container > div.b-link-list__left-col > header.c-block__content-block > h2.c-block__title`

These are opportunities to improve the legibility of your content.

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.

Failing Elements
Learn more about the study `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d56231a7c2e-link`
Learn more about the research `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d56231a7c89-link`
Learn more about the connection `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d56231a7ca6-link`
Read more about their tips for happiness `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d56231ac159-link`
Learn more about their book `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d56231ac1ad-link`
Read more about Jennifer’s book `div.b-card-grid__loop > div.c-card-link-wrapper > div.c-card > a#p-69d56231ac1dc-link`

○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

●`[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 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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Skip links are focusable.

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

○`[accesskey]` values are unique

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

○Elements with `role="dialog"` or `role="alertdialog"` have accessible names.

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

○Elements with an ARIA `[role]` that require children to contain a specific `[role]` have all required children.

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

○Elements with the `role=text` attribute do not have focusable descendents.

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

○The page contains a heading, skip link, or landmark region

○`<dl>`'s contain only properly-ordered `<dt>` and `<dd>` groups, `<script>`, `<template>` or `<div>` elements.

○Definition list items are wrapped in `<dl>` elements

○ARIA IDs are unique

○No form fields have multiple labels

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

○`<html>` element has an `[xml:lang]` attribute with the same base language as the `[lang]` attribute.

○Input buttons have discernible text.

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

○Form elements have associated labels

○The document does not use `<meta http-equiv="refresh">`

○`<object>` elements have alternate text

○Select elements have associated label elements.

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

○Cells in a `<table>` element that use the `[headers]` attribute refer to table cells within the same table.

○`<th>` elements and elements with `[role="columnheader"/"rowheader"]` have data cells they describe.

○`[lang]` attributes have a valid value

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

○Tables have different content in the summary attribute and `<caption>`.

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

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

○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.

Deprecation / Warning	Source
AttributionReporting	connect.facebook.net/en_US/fbevents.js line 273, col 769

URL
/wp-content/themes/core/assets/js/dist/theme/vendor.min.j...

●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 clickjacking with XFO or CSP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

100

SEO

○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

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Browse & Analyze

Learn

Results for https://www.harvard.edu

Site Health

Top Priorities (5)

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Contrast

Best Practices

General

SEO

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Contrast

Best Practices

General

SEO

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