C — https://www.coursera.org

Site Health

Score: 76 / 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

Cookie '__204u' is missing the Secure flag

Security › Cookie Security

No Content-Security-Policy header found

Security › Content Security Policy

13 image-only link(s) without alt text

Accessibility › Link & Button Quality

134 HTTP requests — consider bundling or reducing

Performance › Page Weight Budget

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Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fwww.coursera.org)](https://beavercheck.com/results/b4433154-a37f-372a-2cbe-ebcb573731b9)

HTML

<a href="https://beavercheck.com/results/b4433154-a37f-372a-2cbe-ebcb573731b9"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fwww.coursera.org" alt="BeaverCheck Score"></a>

Image URL

https://beavercheck.com/badge?url=https%3A%2F%2Fwww.coursera.org

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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.

2.91 s

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

13.96 s

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

2.36 s

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

0.028

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

4.96 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.

18.96 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.

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:50.426 source:map[type:text value:[unattributed]]]]

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

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
browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js	110.2 KiB	1.4 s

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

Request	Cache TTL	Transfer Size
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	25.4 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	24.8 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	11.4 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	11.3 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	10.8 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	10.2 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	9.5 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	8.8 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	5.3 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	5.1 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	4.8 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	4.2 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	4.0 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	3.5 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	3.1 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	3.0 KiB

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
40% off team training *up to 125 licenses `div.css-1rqnzpz > div.css-gstc03 > div.css-18rhart > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...	94.1 KiB	70.3 KiB
€205/year `div.css-1rqnzpz > div.css-gstc03 > div.css-18rhart > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...	67.6 KiB	50.5 KiB
div.cds-ProductCard-listCard > div.cds-ProductCard-listContentContainer > div.cds-ProductCard-listPreviewImage > img `div.cds-ProductCard-listCard > div.cds-ProductCard-listContentContainer > div.cds-ProductCard-listPreviewImage > img`	/api/utilities/v1/imageproxy/https://coursera-course-phot...	17.0 KiB	15.3 KiB
div.cds-ProductCard-gridCard > div.cds-ProductCard-gridPreviewContainer > div.cds-CommonCard-previewImage > img `div.cds-ProductCard-gridCard > div.cds-ProductCard-gridPreviewContainer > div.cds-CommonCard-previewImage > img`	/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	25.1 KiB	13.3 KiB
div.cds-ProductCard-gridCard > div.cds-ProductCard-gridPreviewContainer > div.cds-CommonCard-previewImage > img `div.cds-ProductCard-gridCard > div.cds-ProductCard-gridPreviewContainer > div.cds-CommonCard-previewImage > img`	/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	24.5 KiB	12.7 KiB
div.css-18htstt > div.css-1ht76x9 > picture > img `div.css-18htstt > div.css-1ht76x9 > picture > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...	17.2 KiB	12.4 KiB

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

The maximum potential First Input Delay that your users could experience is the duration of the longest task. Learn more about the Maximum Potential First Input Delay metric.

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 JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Estimated savings: 2.1 s 699.0 KiB

URL	Transfer Size	Est Savings
/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1...	426.0 KiB	152.5 KiB
/webapps/r2-builds/br/front-page/13.0842390ff078322547ec.js	230.7 KiB	113.0 KiB
/webapps/r2-builds/br/front-page/en.14.f1452cee01d415df84...	285.1 KiB	102.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer	226.3 KiB	71.2 KiB
accounts.google.com/gsi/client	92.7 KiB	70.1 KiB
www.googletagmanager.com/gtag/destination?id=AW-927621030&cx=c&gtm=4e6460	138.7 KiB	68.0 KiB
www.googletagmanager.com/gtag/js?id=AW-11173242093&cx=c&gtm=4e6460	138.5 KiB	62.4 KiB
browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js	109.9 KiB	59.7 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
/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1...	3.6 s	3.2 s	160 ms
www.coursera.org/	3.4 s	55 ms	28 ms
Unattributable	905 ms	27 ms	0.0 ms
/webapps/r2-builds/br/front-page/en.14.f1452cee01d415df84...	659 ms	485 ms	137 ms
www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer	630 ms	511 ms	103 ms
browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js	340 ms	126 ms	8.4 ms
www.googletagmanager.com/gtag/destination?id=AW-927621030&cx=c&gtm=4e6460	279 ms	237 ms	40 ms
www.googletagmanager.com/gtag/js?id=AW-11173242093&cx=c&gtm=4e6460	132 ms	99 ms	32 ms
/webapps/r2-builds/br/front-page/13.0842390ff078322547ec.js	117 ms	2.0 ms	114 ms
accounts.google.com/gsi/client	64 ms	44 ms	19 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	4.8 s
Other	2.4 s
Rendering	1.2 s
Style & Layout	790 ms
Script Parsing & Compilation	718 ms
Garbage Collection	250 ms
Parse HTML & CSS	100 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

Failure reason	Failure type
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 CSS files can reduce network payload sizes. Learn how to minify CSS.

Estimated savings: 0.0 ms 3.2 KiB

URL	Transfer Size	Est Savings
.css-y40tq5 { position: relative; top: 0px; width: 100%; … } …	42.6 KiB	3.2 KiB

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: 0.0 ms 59.8 KiB

URL	Transfer Size	Est Savings
.css-y40tq5 { position: relative; top: 0px; width: 100%; … } …	42.6 KiB	40.6 KiB
:root{-webkit-print-color-scheme:light;color-scheme:light;--cds-color-darken-975:rgba(15, 17, 20, 0…	30.9 KiB	19.2 KiB

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

	URL
€205/year `div.css-1rqnzpz > div.css-gstc03 > div.css-18rhart > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
40% off team training *up to 125 licenses `div.css-1rqnzpz > div.css-gstc03 > div.css-18rhart > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div.css-18htstt > div.css-1ht76x9 > picture > img `div.css-18htstt > div.css-1ht76x9 > picture > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
€205/year `div.css-9juyzi > div.css-tt9t7i > picture > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
40% off team training *up to 125 licenses `div.css-15xrox9 > div.css-tt9t7i > picture > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div.css-150mpqx > div.css-tt9t7i > picture > img `div.css-150mpqx > div.css-tt9t7i > picture > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-1xgnkn7 > div > img `div > div.css-1xgnkn7 > div > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-19incsy > div.css-phfvho > img.css-1080lsv `div > div.css-19incsy > div.css-phfvho > img.css-1080lsv`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-19incsy > div.css-phfvho > img.css-1080lsv `div > div.css-19incsy > div.css-phfvho > img.css-1080lsv`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-19incsy > div.css-phfvho > img.css-1080lsv `div > div.css-19incsy > div.css-phfvho > img.css-1080lsv`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-19incsy > div.css-phfvho > img.css-1080lsv `div > div.css-19incsy > div.css-phfvho > img.css-1080lsv`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div.css-15xrox9 > div.css-l88zs4 > div > img `div.css-15xrox9 > div.css-l88zs4 > div > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
Use 16 px `div.css-9juyzi > div.css-l88zs4 > div > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
Use 16 px `div > div.css-1xgnkn7 > div > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e `div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e `div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e `div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...

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

●Font display

●LCP breakdown

●LCP request discovery

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●Avoids enormous network payloads Total size was 2,489 KiB

●User Timing marks and measures 27 user timings

●Avoid long main-thread tasks 20 long tasks found

●Avoid non-composited animations 1 animated element found

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 110 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 310 ms

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

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

Link text (and alternate text for images, when used as links) that is discernible, unique, and focusable improves the navigation experience for screen reader users. Learn how to make links accessible.

Failing Elements
div.cds-9 > div.cds-9 > div.css-1cn6k0e > a.cds-149 `div.cds-9 > div.cds-9 > div.css-1cn6k0e > a.cds-149`

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

○Interactive controls are keyboard focusable

○Interactive elements indicate their purpose and state

○The page has a logical tab order

○Visual order on the page follows DOM order

○User focus is not accidentally trapped in a region

○The user's focus is directed to new content added to the page

○HTML5 landmark elements are used to improve navigation

○Offscreen content is hidden from assistive technology

○Custom controls have associated labels

○Custom controls have ARIA roles

●`[aria-*]` attributes match their roles

●`[aria-hidden="true"]` is not present on the document `<body>`

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

●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

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

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

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

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

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

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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

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

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

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

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

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

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

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

○ARIA IDs are unique

○No form fields have multiple labels

○`<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

○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.

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

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

○`[lang]` attributes have a valid value

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

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

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

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

○Identical links have the same purpose.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
Logo of Certified B Corporation `div.cds-9 > div.b-corp-logo > div.css-1oxwx8r > img.css-3gbnhs`	/api/utilities/v1/imageproxy/https://d3njjcbhbojbot.cloud...	111 x 88 (1.26)	223 x 240 (0.93)

General

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

Deprecation / Warning	Source
Unload event listeners are deprecated and will be removed.	browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js line 1, col 105184

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

Source	Description
browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js line 1, col 7754	`[GSI_LOGGER]: FedCM get() rejects with NetworkError: Error retrieving a token.`
browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js line 1, col 7754	{"stack":"Error: Minified React error #419; visit https://reactjs.org/docs/error-decoder.html?invariant=419 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.\n at https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1671518\n at oj (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1672357)\n at Yo (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1714760)\n at Uk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701783)\n at Tk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701711)\n at Ik (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701574)\n at Ek (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1698633)\n at jg (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1638182)\n at https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1705222\n at Pk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1705227)\n at Gk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1697571)\n at J (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:579322)\n at R (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:579903)\n at Ge.tt.<computed> (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599386)\n at run (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599125)\n at MessagePort.listener (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599198)","message":"Minified React error #419; visit https://reactjs.org/docs/error-decoder.html?invariant=419 for the full message or use the non-minified dev environment for full errors and additional helpful warnings."}
/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1... line 1, col 1671517	Error: Minified React error #419; visit https://reactjs.org/docs/error-decoder.html?invariant=419 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1671518 at oj (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1672357) at Yo (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1714760) at Uk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701783) at Tk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701711) at Ik (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701574) at Ek (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1698633) at jg (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1638182) at https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1705222 at Pk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1705227) at Gk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1697571) at J (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:579322) at R (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:579903) at Ge.tt.<computed> (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599386) at run (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599125) at MessagePort.listener (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599198)
www.coursera.org/	`Not signed in with the identity provider.`

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

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

●Ensure CSP is effective against XSS attacks

●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

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

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

100

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.

932 ms

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

2.01 s

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

184 ms

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

0.519

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

2.15 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.

3.64 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.

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.

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:0.5191629999999999] map[node:map[boundingRect:map[bottom:775 height:354 left:0 right:1350 top:421 width:1350] lhId:page-1-DIV nodeLabel:Grow your skills. Shape your career. Build in-demand skills with expert-led pr… path:1,HTML,1,BODY,1,DIV,0,DIV,2,MAIN,0,DIV,1,DIV,2,DIV,0,DIV selector:div.css-1aqb7c2 > div > div.css-1lzurvc > div.cds-1 snippet:<div class="cds-1 css-1m7xe9g cds-2 cds-7" data-testid="block_layout"> type:node] score:0.49964] map[node:map[boundingRect:map[bottom:775 height:354 left:0 right:1350 top:421 width:1350] lhId:page-1-DIV nodeLabel:Grow your skills. Shape your career. Build in-demand skills with expert-led pr… path:1,HTML,1,BODY,1,DIV,0,DIV,2,MAIN,0,DIV,1,DIV,2,DIV,0,DIV selector:div.css-1aqb7c2 > div > div.css-1lzurvc > div.cds-1 snippet:<div class="cds-1 css-1m7xe9g cds-2 cds-7" data-testid="block_layout"> type:node] score:0.019521] map[node:map[boundingRect:map[bottom:759 height:8 left:76 right:84 top:751 width:8] lhId:page-5-BUTTON nodeLabel:Go to item 2 path:1,HTML,1,BODY,1,DIV,0,DIV,2,MAIN,0,DIV,1,DIV,2,DIV,0,DIV,0,DIV,0,DIV,0,DIV,3,DIV,1,DIV,0,BUTTON selector:div.css-6ifc4c > div.css-4510b2 > div.css-168f964 > button.cds-149 snippet:<button class="cds-149 cds-button-disableElevation cds-button-ghost css-gnh8ga" tabindex="-1" type="button"> type:node] score:2e-06]]

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

items: [map[reflowTime:66.957 source:map[type:text value:[unattributed]]]]

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

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
browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js	110.2 KiB	321 ms

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

Request	Cache TTL	Transfer Size
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	13.9 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	8.5 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	7.3 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	7.1 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	5.9 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	5.6 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	5.3 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	5.2 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	4.8 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	2.8 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	2.6 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	2.5 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	2.4 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	2.1 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	2.1 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	2.0 KiB
/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	604800.0 s	1.6 KiB

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
40% off team training *up to 125 licenses `div.css-1rqnzpz > div.css-gstc03 > div.css-18rhart > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...	44.2 KiB	39.6 KiB
€205/year `div.css-1rqnzpz > div.css-gstc03 > div.css-18rhart > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...	34.2 KiB	30.7 KiB
div.cds-ProductCard-gridCard > div.cds-ProductCard-gridPreviewContainer > div.cds-CommonCard-previewImage > img `div.cds-ProductCard-gridCard > div.cds-ProductCard-gridPreviewContainer > div.cds-CommonCard-previewImage > img`	/api/utilities/v1/imageproxy/https://d15cw65ipctsrr.cloud...	13.7 KiB	4.3 KiB

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

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

Element	Layout shift score
Grow your skills. Shape your career. Build in-demand skills with expert-led pr… `div.css-1aqb7c2 > div > div.css-1lzurvc > div.cds-1`	0.500
Grow your skills. Shape your career. Build in-demand skills with expert-led pr… `div.css-1aqb7c2 > div > div.css-1lzurvc > div.cds-1`	0.020
Go to item 2 `div.css-6ifc4c > div.css-4510b2 > div.css-168f964 > button.cds-149`	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.

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 JavaScript and defer loading scripts until they are required to decrease bytes consumed by network activity. Learn how to reduce unused JavaScript.

Estimated savings: 160 ms 697.8 KiB

URL	Transfer Size	Est Savings
/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1...	426.0 KiB	152.1 KiB
/webapps/r2-builds/br/front-page/13.0842390ff078322547ec.js	230.7 KiB	113.0 KiB
/webapps/r2-builds/br/front-page/en.14.f1452cee01d415df84...	285.0 KiB	102.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-5JKLVK&l=dataLayer	226.3 KiB	71.2 KiB
accounts.google.com/gsi/client	92.7 KiB	70.1 KiB
www.googletagmanager.com/gtag/destination?id=AW-927621030&cx=c&gtm=4e6460	138.7 KiB	68.0 KiB
www.googletagmanager.com/gtag/js?id=AW-11173242093&cx=c&gtm=4e6460	138.5 KiB	61.7 KiB
browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js	109.9 KiB	59.7 KiB

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

Category	Time Spent
Script Evaluation	969 ms
Other	661 ms
Rendering	358 ms
Style & Layout	207 ms
Script Parsing & Compilation	176 ms
Garbage Collection	52 ms
Parse HTML & CSS	25 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

Failure reason	Failure type
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 CSS files can reduce network payload sizes. Learn how to minify CSS.

Estimated savings: 0.0 ms 3.6 KiB

URL	Transfer Size	Est Savings
.css-y40tq5 { position: relative; top: 0px; width: 100%; … } …	46.1 KiB	3.6 KiB

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: 0.0 ms 64.8 KiB

URL	Transfer Size	Est Savings
.css-y40tq5 { position: relative; top: 0px; width: 100%; … } …	46.1 KiB	45.4 KiB
:root{-webkit-print-color-scheme:light;color-scheme:light;--cds-color-darken-975:rgba(15, 17, 20, 0…	31.6 KiB	19.4 KiB

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

	URL
€205/year `div.css-9juyzi > div.css-tt9t7i > picture > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
40% off team training *up to 125 licenses `div.css-15xrox9 > div.css-tt9t7i > picture > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div.css-150mpqx > div.css-tt9t7i > picture > img `div.css-150mpqx > div.css-tt9t7i > picture > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
€205/year `div.css-1rqnzpz > div.css-gstc03 > div.css-18rhart > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
40% off team training *up to 125 licenses `div.css-1rqnzpz > div.css-gstc03 > div.css-18rhart > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div.css-15xrox9 > div.css-l88zs4 > div > img `div.css-15xrox9 > div.css-l88zs4 > div > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-1xgnkn7 > div > img `div > div.css-1xgnkn7 > div > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-19incsy > div.css-phfvho > img.css-1080lsv `div > div.css-19incsy > div.css-phfvho > img.css-1080lsv`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-19incsy > div.css-phfvho > img.css-1080lsv `div > div.css-19incsy > div.css-phfvho > img.css-1080lsv`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-19incsy > div.css-phfvho > img.css-1080lsv `div > div.css-19incsy > div.css-phfvho > img.css-1080lsv`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-19incsy > div.css-phfvho > img.css-1080lsv `div > div.css-19incsy > div.css-phfvho > img.css-1080lsv`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e `div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e `div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
Use 16 px `div.css-9juyzi > div.css-l88zs4 > div > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
Use 16 px `div > div.css-1xgnkn7 > div > img`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...
div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e `div > div.css-akqzvp > a.cds-119 > img.css-11x1h9e`	/api/utilities/v1/imageproxy/https://images.ctfassets.net...

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

●Document request latency

●Optimize DOM size

●Font display

●LCP breakdown

●LCP request discovery

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●Avoids enormous network payloads Total size was 2,279 KiB

●User Timing marks and measures 27 user timings

●JavaScript execution time 1.0 s

●Avoid long main-thread tasks 4 long tasks found

●Avoid non-composited animations 1 animated element found

●Network Requests

●Network Round Trip Times 100 ms

●Server Backend Latencies 110 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 370 ms

○INP breakdown

100

Accessibility

○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

●Buttons have an accessible name

●Image elements have `[alt]` attributes

●Form elements have associated labels

●`[user-scalable="no"]` is not used in the `<meta name="viewport">` element and the `[maximum-scale]` attribute is not less than 5.

●ARIA attributes are used as specified for the element's role

●`[aria-hidden="true"]` elements do not contain focusable descendents

●Elements use only permitted ARIA attributes

●Background and foreground colors have a sufficient contrast ratio

●Document has a `<title>` element

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

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

●Links have a discernible name

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

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

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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

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

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

○ARIA input fields have accessible names

○ARIA `meter` elements have accessible names

○ARIA `progressbar` elements have accessible names

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

○ARIA toggle fields have accessible names

○ARIA `tooltip` elements have accessible names

○ARIA `treeitem` elements have accessible names

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

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

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

○ARIA IDs are unique

○No form fields have multiple labels

○`<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

○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.

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

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

○`[lang]` attributes have a valid value

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

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

○All heading elements contain content.

○Uses ARIA roles only on compatible elements

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

○Identical links have the same purpose.

○Tables use `<caption>` instead of cells with the `[colspan]` attribute to indicate a caption.

○`<td>` elements in a large `<table>` have one or more table headers.

Best Practices

User Experience

Image display dimensions should match natural aspect ratio. Learn more about image aspect ratio.

	URL	Aspect Ratio (Displayed)	Aspect Ratio (Actual)
Logo of Certified B Corporation `div.cds-9 > div.b-corp-logo > div.css-1oxwx8r > img.css-3gbnhs`	/api/utilities/v1/imageproxy/https://d3njjcbhbojbot.cloud...	151 x 120 (1.26)	223 x 240 (0.93)

General

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

Deprecation / Warning	Source
Unload event listeners are deprecated and will be removed.	browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js line 1, col 105184

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

Source	Description
browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js line 1, col 7754	`[GSI_LOGGER]: FedCM get() rejects with NetworkError: Error retrieving a token.`
browser.sentry-cdn.com/7.116.0/bundle.tracing.min.js line 1, col 7754	{"stack":"Error: Minified React error #419; visit https://reactjs.org/docs/error-decoder.html?invariant=419 for the full message or use the non-minified dev environment for full errors and additional helpful warnings.\n at https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1671518\n at oj (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1672357)\n at Yo (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1714760)\n at Uk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701783)\n at Tk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701711)\n at Ik (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701574)\n at Ek (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1698633)\n at jg (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1638182)\n at https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1705222\n at Pk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1705227)\n at Gk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1697571)\n at J (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:579322)\n at R (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:579903)\n at Ge.tt.<computed> (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599386)\n at run (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599125)\n at MessagePort.listener (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599198)","message":"Minified React error #419; visit https://reactjs.org/docs/error-decoder.html?invariant=419 for the full message or use the non-minified dev environment for full errors and additional helpful warnings."}
/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1... line 1, col 1671517	Error: Minified React error #419; visit https://reactjs.org/docs/error-decoder.html?invariant=419 for the full message or use the non-minified dev environment for full errors and additional helpful warnings. at https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1671518 at oj (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1672357) at Yo (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1714760) at Uk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701783) at Tk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701711) at Ik (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1701574) at Ek (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1698633) at jg (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1638182) at https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1705222 at Pk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1705227) at Gk (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:1697571) at J (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:579322) at R (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:579903) at Ge.tt.<computed> (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599386) at run (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599125) at MessagePort.listener (https://d3njjcbhbojbot.cloudfront.net/webapps/r2-builds/br/front-page/en.app.065b0df2eb410c5e1c70.js:2:599198)
www.coursera.org/	`Not signed in with the identity provider.`

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

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

●Ensure CSP is effective against XSS attacks

●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

○Use a strong HSTS policy

○Mitigate clickjacking with XFO or CSP

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.coursera.org

Site Health

Top Priorities (5)

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Best Practices

User Experience

General

SEO

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Best Practices

User Experience

General

SEO

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