C — https://kotlinlang.org | BeaverCheck Audit

Site Health

Score: 73 / 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

Page weighs 10.1 MB (4.4 MB transferred)

Performance › Page Weight Budget

2 button(s) with no accessible text

Accessibility › Link & Button Quality

Embed this badge

Markdown

[![BeaverCheck](https://beavercheck.com/badge?url=https%3A%2F%2Fkotlinlang.org)](https://beavercheck.com/results/30953d2e-f539-8eda-9249-9f28efb6f05c)

HTML

<a href="https://beavercheck.com/results/30953d2e-f539-8eda-9249-9f28efb6f05c"><img src="https://beavercheck.com/badge?url=https%3A%2F%2Fkotlinlang.org" alt="BeaverCheck Score"></a>

Image URL

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

This badge auto-updates with your latest scan result.

Was this report useful?

Thanks for your feedback!

Press ? for shortcuts

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse.

Performance

100

Accessibility

Best Practices

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.

3.64 s

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

23.87 s

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

3.25 s

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

0.083

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

8.75 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.

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

Request	Cache TTL	Transfer Size
/_next/static/chunks/images/hero-3600-d09c50b3a9c0ba44d2d...	0.0 ms	385.7 KiB
/_next/static/chunks/images/hero-cover@2x-0095f955d809bb1...	0.0 ms	250.2 KiB
/_next/static/chunks/images/news-3-f00059c51ca224ca6ea9d6...	0.0 ms	236.5 KiB
/_next/static/chunks/images/news-0-6b2d632194750144c12dd7...	0.0 ms	232.1 KiB
/_next/static/chunks/images/news-1-8d69efc91fd65f370d839a...	0.0 ms	226.6 KiB
kotlinlang.org/_next/static/chunks/ba4f7f0f.fa42d89b8c81cd7a.js	0.0 ms	226.2 KiB
/_next/static/chunks/images/news-2-29ec7d6f829df3dcddae60...	0.0 ms	174.3 KiB
kotlinlang.org/_next/static/chunks/0883b4f9.f93badb8ae74b3c8.js	0.0 ms	143.7 KiB
cdn.optimizely.com/js/26633200186.js	120.0 s	104.4 KiB
kotlinlang.org/_next/static/chunks/pages/index-6bf78d87611424e9.js	0.0 ms	90.3 KiB
/storage/jetbrains-mono/v2.304/webfonts/JetBrainsMono-Bol...	600.0 s	92.9 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	95.0 KiB
/_next/static/chunks/images/hero-cover-6dd34ed75729683235...	0.0 ms	71.2 KiB
kotlinlang.org/_next/static/chunks/773-a0a6eaa078407a91.js	0.0 ms	71.2 KiB
/public/client_js/capiParamBuilder/clientParamBuilder.bun...	0.0 ms	63.2 KiB
/_next/static/chunks/images/mobile@2x-240cff8657285d7bde9...	0.0 ms	61.8 KiB
/storage/jetbrains-sans/google-fonts/v1.309/variable/JetB...	600.0 s	59.2 KiB
kotlinlang.org/_next/static/chunks/framework-945b357d4a851f4b.js	0.0 ms	44.4 KiB
kotlinlang.org/_next/static/chunks/26-c73158c5dd2d2553.js	0.0 ms	40.7 KiB
/signals/config/357569036421264?v=2.9.291&r=stable&domain...	1200.0 s	43.7 KiB
/storage/jetbrains-sans/google-fonts/v1.309/webfonts/JetB...	600.0 s	39.2 KiB
/storage/jetbrains-sans/google-fonts/v1.309/webfonts/JetB...	600.0 s	38.1 KiB
kotlinlang.org/_next/static/chunks/main-6c278a455fc51081.js	0.0 ms	33.1 KiB
kotlinlang.org/_next/static/chunks/476-5e1beefb153ef900.js	0.0 ms	19.7 KiB
www.redditstatic.com/ads/pixel.js?pixel_id=t2_15gdox	60.0 s	19.0 KiB
kotlinlang.org/_next/static/css/6b362df15a64b242.css	0.0 ms	16.6 KiB
img.youtube.com/vi/JGvk4M0Rfxo/maxresdefault.jpg	7200.0 s	20.6 KiB
cdn.cookiehub.eu/c2/48464916.js	86400.0 s	38.0 KiB
/_next/static/chunks/images/gradle-logo-90c75611ac7729f90...	0.0 ms	15.2 KiB
scripts.clarity.ms/0.8.59/clarity.js	86400.0 s	26.2 KiB
a.quora.com/qevents.js	14400.0 s	14.7 KiB
kotlinlang.org/_next/static/chunks/4470-4a9495acb24020bf.js	0.0 ms	9.7 KiB
c.amazon-adsystem.com/aat/amzn.js	0.0 ms	8.9 KiB
kotlinlang.org/_next/static/css/e3f8aac9de04d5be.css	0.0 ms	7.6 KiB
snap.licdn.com/li.lms-analytics/insight.min.js	86400.0 s	18.7 KiB
/_next/static/chunks/images/multiplatform-preview-7b3351f...	0.0 ms	7.0 KiB
kotlinlang.org/_next/static/chunks/webpack-1dab8a1d09212e64.js	0.0 ms	6.8 KiB
kotlinlang.org/_next/static/chunks/2001-ee86f088e96fd922.js	0.0 ms	6.1 KiB
kotlinlang.org/_next/static/chunks/5374.dff3eb979b5c4dc8.js	0.0 ms	5.6 KiB
kotlinlang.org/_next/static/chunks/8768-e3ffa8a999942377.js	0.0 ms	5.6 KiB
kotlinlang.org/_next/static/chunks/3533-ad26980c2a36b5e2.js	0.0 ms	5.3 KiB
cdn.cookiehub.eu/c2/css/48464916.css	86400.0 s	13.1 KiB
kotlinlang.org/_next/static/css/6f5910a5c34862a6.css	0.0 ms	5.2 KiB
kotlinlang.org/_next/static/chunks/558-d51760342a2b12d1.js	0.0 ms	4.8 KiB
kotlinlang.org/_next/static/chunks/pages/_app-53630556d0708053.js	0.0 ms	4.5 KiB
kotlinlang.org/_next/static/css/29b515d55d7d8806.css	0.0 ms	4.4 KiB
kotlinlang.org/_next/static/css/1797f4fcb8578d9e.css	0.0 ms	3.5 KiB
kotlinlang.org/_next/static/chunks/1664-75f24d836dbc8dde.js	0.0 ms	3.2 KiB
kotlinlang.org/_next/static/chunks/2897-5fd1340311e3571a.js	0.0 ms	2.7 KiB
kotlinlang.org/_next/static/chunks/2126.9f6f098bd67d64dc.js	0.0 ms	2.6 KiB
kotlinlang.org/_next/static/chunks/1584.aabe8dd88f2a3ecb.js	0.0 ms	2.3 KiB
kotlinlang.org/_next/static/AuBBe4BL3FH4G354eIk2R/_buildManifest.js	0.0 ms	1.8 KiB
kotlinlang.org/_next/static/chunks/3995.c03663b3f24fc460.js	0.0 ms	1.5 KiB
kotlinlang.org/_next/static/chunks/7211.7b7af9e0cb8d1f14.js	0.0 ms	782 B
kotlinlang.org/_next/static/chunks/9168.188c4f8b10b8e3d4.js	0.0 ms	706 B
kotlinlang.org/_next/static/css/2a2e258e34bf0e24.css	0.0 ms	698 B
/rp.gif?ts=1775593672974&id=t2_15gdox&event=PageVisit&m.v...	0.0 ms	637 B
kotlinlang.org/_next/static/AuBBe4BL3FH4G354eIk2R/_ssgManifest.js	0.0 ms	600 B
/collect?v=2&fmt=js&pid=154418&time=1775593673187&li_adsI...	0.0 ms	451 B
cdn3.optimizely.com/js/geo4.js	0.0 ms	331 B
/_/ad/05e92ac0a366441eb73357c2cb81d92e/pixel?tag=ViewCont...	0.0 ms	296 B
/tr/?id=357569036421264&ev=PageView&dl=https%3A%2F%2Fkotl...	0.0 ms	16 B

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:63.628 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
KotlinConf’26 Speakers: In Conversation With Lena Reinhard `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-0-6b2d632194750144c12dd7...	231.3 KiB	201.4 KiB
KotlinConf banner `div.ktl-layout > a.kotlin-conf-banner_link__zMv9_ > picture > img.kotlin-conf-banner_image__yzSRR`	/_next/static/chunks/images/mobile@2x-240cff8657285d7bde9...	61.3 KiB	44.9 KiB
kotlin `div.ktl-layout > div.hero_grid__H0SX3 > div.hero_content__D8FJt > img.hero_imageMobile__3isv_`	/_next/static/chunks/images/hero-cover-6dd34ed75729683235...	70.7 KiB	37.0 KiB
Gradle logo `div.foundation-preview_foundationPreview__7TrlB > div.foundation-preview_secondBlock__npr_1 > div.foundation-preview_companies__AnbeL > img.foundation-preview_companyLogo__miayx`	/_next/static/chunks/images/gradle-logo-90c75611ac7729f90...	14.7 KiB	13.7 KiB

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

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

items: [map[duration:606.8690000038147 label:Time to first byte subpart:timeToFirstByte] map[duration:3536.4719999961853 label:Element render delay subpart:elementRenderDelay]]

lhId: page-4-P

nodeLabel: Our website uses some cookies and records your IP address for the purposes of a…

path: 1,HTML,1,BODY,0,DIV,0,DIV,0,DIV,1,DIV,1,P

selector: div.ch2-container > div#ch2-dialog > div.ch2-dialog-content > p#ch2-dialog-description

snippet: <p id="ch2-dialog-description">

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.

More than 4 preconnect connections were found. These should be used sparingly and only to the most important origins.

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
cdn.optimizely.com/js/26633200186.js	104.4 KiB	1.4 s

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
/storage/jetbrains-sans/google-fonts/v1.309/variable/JetB...	10 ms
/storage/jetbrains-mono/v2.304/webfonts/JetBrainsMono-Bol...	10 ms
/storage/jetbrains-sans/google-fonts/v1.309/webfonts/JetB...	5.0 ms
/storage/jetbrains-sans/google-fonts/v1.309/webfonts/JetB...	5.0 ms

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

Estimated savings: 2.7 s 664.4 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=AW-963127096&cx=c&gtm=4e6460	146.3 KiB	105.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-NL29B334&gtm=4e6460	167.0 KiB	72.7 KiB
kotlinlang.org/_next/static/chunks/0883b4f9.f93badb8ae74b3c8.js	143.2 KiB	68.7 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js	105.3 KiB	62.9 KiB
www.googletagmanager.com/gtag/js?id=G-9J976DJZ68&cx=c&gtm=4e6460	174.1 KiB	61.3 KiB
www.googletagmanager.com/gtag/js?id=G-M8TDRLXFQH&cx=c&gtm=4e6460	142.8 KiB	59.3 KiB
www.googletagmanager.com/gtag/js?id=AW-1071903267&cx=c&gtm=4e6460	146.3 KiB	54.4 KiB
www.googletagmanager.com/gtm.js?id=GTM-5P98	203.2 KiB	53.0 KiB
cdn.optimizely.com/js/26633200186.js	103.8 KiB	36.7 KiB
connect.facebook.net/en_US/fbevents.js	94.8 KiB	33.8 KiB
kotlinlang.org/_next/static/chunks/773-a0a6eaa078407a91.js	70.7 KiB	31.1 KiB
/public/client_js/capiParamBuilder/clientParamBuilder.bun...	62.8 KiB	25.5 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
Unattributable	1.3 s	319 ms	0.0 ms
www.googletagmanager.com/gtm.js?id=GTM-NL29B334&gtm=4e6460	1.0 s	910 ms	67 ms
www.googletagmanager.com/gtm.js?id=GTM-5P98	898 ms	762 ms	108 ms
kotlinlang.org/	851 ms	127 ms	1.2 ms
cdn.cookiehub.eu/c2/48464916.js	657 ms	588 ms	22 ms
kotlinlang.org/_next/static/chunks/framework-945b357d4a851f4b.js	596 ms	512 ms	20 ms
cdn.optimizely.com/js/26633200186.js	586 ms	488 ms	46 ms
kotlinlang.org/_next/static/chunks/0883b4f9.f93badb8ae74b3c8.js	493 ms	350 ms	64 ms
www.googletagmanager.com/gtag/js?id=G-9J976DJZ68&cx=c&gtm=4e6460	391 ms	307 ms	77 ms
kotlinlang.org/_next/static/chunks/ba4f7f0f.fa42d89b8c81cd7a.js	374 ms	241 ms	75 ms
kotlinlang.org/_next/static/chunks/pages/index-6bf78d87611424e9.js	301 ms	267 ms	33 ms
scripts.clarity.ms/0.8.59/clarity.js	277 ms	203 ms	13 ms
www.googletagmanager.com/gtag/js?id=AW-1071903267&cx=c&gtm=4e6460	241 ms	177 ms	61 ms
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js	213 ms	147 ms	62 ms
www.googletagmanager.com/gtag/js?id=G-M8TDRLXFQH&cx=c&gtm=4e6460	195 ms	148 ms	45 ms
connect.facebook.net/en_US/fbevents.js	175 ms	128 ms	46 ms
/signals/config/357569036421264?v=2.9.291&r=stable&domain...	137 ms	105 ms	20 ms
www.redditstatic.com/ads/pixel.js?pixel_id=t2_15gdox	82 ms	56 ms	9.0 ms
www.googletagmanager.com/gtag/js?id=AW-963127096&cx=c&gtm=4e6460	80 ms	27 ms	52 ms
kotlinlang.org/_next/static/chunks/main-6c278a455fc51081.js	79 ms	61 ms	16 ms
kotlinlang.org/_next/static/chunks/773-a0a6eaa078407a91.js	79 ms	26 ms	35 ms
analytics.tiktok.com/i18n/pixel/static/identify_5cff1caf.js	60 ms	38 ms	21 ms
static.ads-twitter.com/uwt.js	59 ms	49 ms	6.5 ms
bat.bing.com/bat.js	55 ms	47 ms	7.6 ms
snap.licdn.com/li.lms-analytics/insight.min.js	51 ms	41 ms	6.6 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	7.0 s
Other	1.2 s
Script Parsing & Compilation	997 ms
Style & Layout	598 ms
Garbage Collection	180 ms
Rendering	134 ms
Parse HTML & CSS	87 ms

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

Estimated savings: 0.0 ms 7.6 KiB

URL	Transfer Size	Est Savings
/* BASICS / .CodeMirror { / Set height, width, borders, and global font properties here */ fo… } …	5.1 KiB	3.9 KiB
.executable-fragment-wrapper{margin-bottom:35px;position:relative} …	8.0 KiB	3.8 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 22.5 KiB

URL	Transfer Size	Est Savings
kotlinlang.org/_next/static/css/6b362df15a64b242.css	16.1 KiB	12.0 KiB
cdn.cookiehub.eu/c2/css/48464916.css	12.2 KiB	10.5 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
/_next/static/chunks/images/hero-3600-d09c50b3a9c0ba44d2d...	385.7 KiB
/_next/static/chunks/images/hero-cover@2x-0095f955d809bb1...	250.2 KiB
/_next/static/chunks/images/news-3-f00059c51ca224ca6ea9d6...	236.5 KiB
/_next/static/chunks/images/news-0-6b2d632194750144c12dd7...	232.1 KiB
/_next/static/chunks/images/news-1-8d69efc91fd65f370d839a...	226.6 KiB
kotlinlang.org/_next/static/chunks/ba4f7f0f.fa42d89b8c81cd7a.js	226.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-5P98	203.5 KiB
/_next/static/chunks/images/news-2-29ec7d6f829df3dcddae60...	174.3 KiB
www.googletagmanager.com/gtag/js?id=G-9J976DJZ68&cx=c&gtm=4e6460	174.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-NL29B334&gtm=4e6460	167.1 KiB

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

	URL
div.index_videoWrapper__pTclA > div.ktl-youtube-player-module_youtube-player_aSb0a > div.ktl-youtube-player-module_preview_SuIdr > img.ktl-youtube-player-module_image-preview_qXCFf `div.index_videoWrapper__pTclA > div.ktl-youtube-player-module_youtube-player_aSb0a > div.ktl-youtube-player-module_preview_SuIdr > img.ktl-youtube-player-module_image-preview_qXCFf`	img.youtube.com/vi/JGvk4M0Rfxo/maxresdefault.jpg
Gradle logo `div.foundation-preview_foundationPreview__7TrlB > div.foundation-preview_secondBlock__npr_1 > div.foundation-preview_companies__AnbeL > img.foundation-preview_companyLogo__miayx`	/_next/static/chunks/images/gradle-logo-90c75611ac7729f90...
div.ktl-layout > div.info-block_container__1_jl6 > div.info-block_item__lGaST > img `div.ktl-layout > div.info-block_container__1_jl6 > div.info-block_item__lGaST > img`	/_next/static/chunks/images/multiplatform-preview-7b3351f...
KotlinConf’26 Speakers: In Conversation With Lena Reinhard `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-0-6b2d632194750144c12dd7...
KotlinConf banner `div.ktl-layout > a.kotlin-conf-banner_link__zMv9_ > picture > img.kotlin-conf-banner_image__yzSRR`	/_next/static/chunks/images/mobile@2x-240cff8657285d7bde9...

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

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●User Timing marks and measures 24 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 220 ms

●Server Backend Latencies 590 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 590 ms

●Avoid large layout shifts 1 layout shift found

○INP breakdown

○LCP request discovery

○Avoid non-composited animations

100

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.

○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

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

●`[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 are distinguishable without relying on color.

●Links have a discernible name

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

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

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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

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

○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.

○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.

○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	snap.licdn.com/li.lms-analytics/insight.min.js

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
kotlinlang.org/_next/static/chunks/ba4f7f0f.fa42d89b8c81cd7a.js

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

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

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

SEO

These checks ensure that your page is following basic search engine optimization advice. There are many additional factors Lighthouse does not score here that may affect your search ranking, including performance on Core Web Vitals. Learn more about Google Search Essentials.

Content Best Practices

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

Link destination	Link Text
www.jetbrains.com/legal/docs/privacy/cookie-notice/	Learn more
kotlinlang.org/multiplatform/	Learn more

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Lighthouse Scores

Industry-standard audits powered by Google Lighthouse. — Desktop

Performance

Accessibility

Best Practices

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.

1.69 s

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

2.10 s

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

318 ms

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

0.034

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

3.88 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.

7.35 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.

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

Request	Cache TTL	Transfer Size
/_next/static/chunks/images/wide@1x-97ec69b23541691343d3a...	0.0 ms	397.5 KiB
/_next/static/chunks/images/hero-3600-d09c50b3a9c0ba44d2d...	0.0 ms	385.7 KiB
kotlinlang.org/_next/static/chunks/ba4f7f0f.fa42d89b8c81cd7a.js	0.0 ms	226.8 KiB
kotlinlang.org/_next/static/chunks/0883b4f9.f93badb8ae74b3c8.js	0.0 ms	143.6 KiB
cdn.optimizely.com/js/26633200186.js	120.0 s	104.4 KiB
kotlinlang.org/_next/static/chunks/pages/index-6bf78d87611424e9.js	0.0 ms	90.1 KiB
/storage/jetbrains-mono/v2.304/webfonts/JetBrainsMono-Bol...	600.0 s	92.9 KiB
connect.facebook.net/en_US/fbevents.js	1200.0 s	95.0 KiB
/_next/static/chunks/images/hero-cover-6dd34ed75729683235...	0.0 ms	71.2 KiB
kotlinlang.org/_next/static/chunks/773-a0a6eaa078407a91.js	0.0 ms	71.1 KiB
/public/client_js/capiParamBuilder/clientParamBuilder.bun...	0.0 ms	63.2 KiB
/storage/jetbrains-sans/google-fonts/v1.309/variable/JetB...	600.0 s	59.2 KiB
/_next/static/chunks/images/news-3-ed0d012b40f41528f3a2cd...	0.0 ms	52.8 KiB
/_next/static/chunks/images/news-0-142f049046b735e33a9f1f...	0.0 ms	48.0 KiB
/_next/static/chunks/images/news-1-c0b9fe17023a6388d98f6f...	0.0 ms	47.9 KiB
kotlinlang.org/_next/static/chunks/framework-945b357d4a851f4b.js	0.0 ms	44.5 KiB
/_next/static/chunks/images/news-2-1c219af127c630afc917a4...	0.0 ms	44.2 KiB
kotlinlang.org/_next/static/chunks/26-c73158c5dd2d2553.js	0.0 ms	40.7 KiB
/signals/config/357569036421264?v=2.9.291&r=stable&domain...	1200.0 s	43.7 KiB
/storage/jetbrains-sans/google-fonts/v1.309/webfonts/JetB...	600.0 s	39.2 KiB
/storage/jetbrains-sans/google-fonts/v1.309/webfonts/JetB...	600.0 s	38.1 KiB
kotlinlang.org/_next/static/chunks/main-6c278a455fc51081.js	0.0 ms	33.1 KiB
kotlinlang.org/_next/static/chunks/476-5e1beefb153ef900.js	0.0 ms	19.7 KiB
www.redditstatic.com/ads/pixel.js?pixel_id=t2_15gdox	60.0 s	19.0 KiB
kotlinlang.org/_next/static/css/6b362df15a64b242.css	0.0 ms	16.5 KiB
img.youtube.com/vi/JGvk4M0Rfxo/maxresdefault.jpg	7200.0 s	20.6 KiB
cdn.cookiehub.eu/c2/48464916.js	86400.0 s	38.0 KiB
/_next/static/chunks/images/gradle-logo-90c75611ac7729f90...	0.0 ms	15.2 KiB
scripts.clarity.ms/0.8.59/clarity.js	86400.0 s	26.2 KiB
a.quora.com/qevents.js	14400.0 s	14.7 KiB
kotlinlang.org/_next/static/chunks/4470-4a9495acb24020bf.js	0.0 ms	9.7 KiB
c.amazon-adsystem.com/aat/amzn.js	0.0 ms	8.9 KiB
kotlinlang.org/_next/static/css/e3f8aac9de04d5be.css	0.0 ms	7.6 KiB
snap.licdn.com/li.lms-analytics/insight.min.js	86400.0 s	18.7 KiB
/_next/static/chunks/images/multiplatform-preview-7b3351f...	0.0 ms	7.1 KiB
kotlinlang.org/_next/static/chunks/webpack-1dab8a1d09212e64.js	0.0 ms	6.9 KiB
kotlinlang.org/_next/static/chunks/2001-ee86f088e96fd922.js	0.0 ms	6.1 KiB
kotlinlang.org/_next/static/chunks/5374.dff3eb979b5c4dc8.js	0.0 ms	5.6 KiB
kotlinlang.org/_next/static/chunks/8768-e3ffa8a999942377.js	0.0 ms	5.6 KiB
kotlinlang.org/_next/static/chunks/3533-ad26980c2a36b5e2.js	0.0 ms	5.3 KiB
cdn.cookiehub.eu/c2/css/48464916.css	86400.0 s	13.1 KiB
kotlinlang.org/_next/static/css/6f5910a5c34862a6.css	0.0 ms	5.2 KiB
kotlinlang.org/_next/static/chunks/558-d51760342a2b12d1.js	0.0 ms	4.8 KiB
kotlinlang.org/_next/static/chunks/pages/_app-53630556d0708053.js	0.0 ms	4.5 KiB
kotlinlang.org/_next/static/css/29b515d55d7d8806.css	0.0 ms	4.4 KiB
kotlinlang.org/_next/static/css/1797f4fcb8578d9e.css	0.0 ms	3.5 KiB
kotlinlang.org/_next/static/chunks/1664-75f24d836dbc8dde.js	0.0 ms	3.2 KiB
kotlinlang.org/_next/static/chunks/2897-5fd1340311e3571a.js	0.0 ms	2.7 KiB
kotlinlang.org/_next/static/chunks/2126.9f6f098bd67d64dc.js	0.0 ms	2.6 KiB
kotlinlang.org/_next/static/chunks/1584.aabe8dd88f2a3ecb.js	0.0 ms	2.3 KiB
kotlinlang.org/_next/static/AuBBe4BL3FH4G354eIk2R/_buildManifest.js	0.0 ms	1.8 KiB
kotlinlang.org/_next/static/chunks/3995.c03663b3f24fc460.js	0.0 ms	1.5 KiB
kotlinlang.org/_next/static/chunks/7211.7b7af9e0cb8d1f14.js	0.0 ms	784 B
kotlinlang.org/_next/static/chunks/9168.188c4f8b10b8e3d4.js	0.0 ms	708 B
kotlinlang.org/_next/static/css/2a2e258e34bf0e24.css	0.0 ms	699 B
/rp.gif?ts=1775593697693&id=t2_15gdox&event=PageVisit&m.v...	0.0 ms	637 B
kotlinlang.org/_next/static/AuBBe4BL3FH4G354eIk2R/_ssgManifest.js	0.0 ms	601 B
/collect?v=2&fmt=js&pid=154418&time=1775593697805&li_adsI...	0.0 ms	454 B
cdn3.optimizely.com/js/geo4.js	0.0 ms	340 B
/_/ad/05e92ac0a366441eb73357c2cb81d92e/pixel?tag=ViewCont...	0.0 ms	274 B
/tr/?id=357569036421264&ev=PageView&dl=https%3A%2F%2Fkotl...	0.0 ms	16 B

Your first network request is the most important. Reduce its latency by avoiding redirects, ensuring a fast server response, and enabling text compression.

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

items: [map[reflowTime:57.89 source:map[type:text value:[unattributed]]]]

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

lhId: page-0-IMG

nodeLabel: kotlin

path: 1,HTML,1,BODY,1,DIV,1,DIV,5,SECTION,0,DIV,0,DIV,1,IMG

selector: section.hero_heroSection__5XxnZ > div.ktl-layout > div.hero_grid__H0SX3 > img.hero_imageDesktop__yBAJU

snippet: <img class="hero_imageDesktop__yBAJU" src="/_next/static/chunks/images/hero-cover-6dd34ed75729683235a4f47d714a604e.png" srcset="/_next/static/chunks/images/hero-cover@2x-0095f955d809bb1d716b7ad41889166b…" alt="kotlin" height="560" width="560">

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
cdn.optimizely.com/js/26633200186.js	104.4 KiB	384 ms

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
/storage/jetbrains-sans/google-fonts/v1.309/variable/JetB...	15 ms
/storage/jetbrains-sans/google-fonts/v1.309/webfonts/JetB...	10 ms
/storage/jetbrains-sans/google-fonts/v1.309/webfonts/JetB...	10 ms
/storage/jetbrains-mono/v2.304/webfonts/JetBrainsMono-Bol...	5.0 ms

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
KotlinConf banner `div.ktl-layout > a.kotlin-conf-banner_link__zMv9_ > picture > img.kotlin-conf-banner_image__yzSRR`	/_next/static/chunks/images/wide@1x-97ec69b23541691343d3a...	396.6 KiB	341.7 KiB
KotlinConf’26 Speakers: In Conversation with Josh Long `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-3-ed0d012b40f41528f3a2cd...	52.3 KiB	45.2 KiB
KotlinConf’26 Speakers: In Conversation With Lena Reinhard `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-0-142f049046b735e33a9f1f...	47.5 KiB	40.4 KiB
Kodee’s Kotlin Roundup: Kotlin 2.3.20, Interview With Josh Long, and More `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-1-c0b9fe17023a6388d98f6f...	47.4 KiB	40.2 KiB
Amper 0.10 – JDK Provisioning, a Maven Converter, Custom Compiler Plugins, and … `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-2-1c219af127c630afc917a4...	43.7 KiB	36.5 KiB
kotlin `section.hero_heroSection__5XxnZ > div.ktl-layout > div.hero_grid__H0SX3 > img.hero_imageDesktop__yBAJU`	/_next/static/chunks/images/hero-cover-6dd34ed75729683235...	70.7 KiB	26.6 KiB

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

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

Estimated savings: 582 ms

URL	Time Spent
kotlinlang.org/	682 ms

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: 80 ms 664.1 KiB

URL	Transfer Size	Est Savings
www.googletagmanager.com/gtag/js?id=AW-963127096&cx=c&gtm=4e6460	146.3 KiB	105.0 KiB
www.googletagmanager.com/gtm.js?id=GTM-NL29B334&gtm=4e6460	167.0 KiB	72.8 KiB
kotlinlang.org/_next/static/chunks/0883b4f9.f93badb8ae74b3c8.js	143.2 KiB	67.2 KiB
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js	105.3 KiB	62.9 KiB
www.googletagmanager.com/gtag/js?id=G-9J976DJZ68&cx=c&gtm=4e6460	174.1 KiB	61.1 KiB
www.googletagmanager.com/gtag/js?id=G-M8TDRLXFQH&cx=c&gtm=4e6460	142.8 KiB	59.3 KiB
www.googletagmanager.com/gtag/js?id=AW-1071903267&cx=c&gtm=4e6460	146.3 KiB	54.5 KiB
www.googletagmanager.com/gtm.js?id=GTM-5P98	203.2 KiB	52.5 KiB
cdn.optimizely.com/js/26633200186.js	103.8 KiB	36.8 KiB
connect.facebook.net/en_US/fbevents.js	94.8 KiB	34.2 KiB
kotlinlang.org/_next/static/chunks/773-a0a6eaa078407a91.js	70.6 KiB	32.4 KiB
/public/client_js/capiParamBuilder/clientParamBuilder.bun...	62.8 KiB	25.5 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
Unattributable	279 ms	58 ms	0.0 ms
www.googletagmanager.com/gtm.js?id=GTM-5P98	238 ms	204 ms	27 ms
www.googletagmanager.com/gtag/js?id=AW-1071903267&cx=c&gtm=4e6460	217 ms	199 ms	14 ms
cdn.cookiehub.eu/c2/48464916.js	202 ms	158 ms	5.8 ms
kotlinlang.org/	179 ms	36 ms	0.3 ms
cdn.optimizely.com/js/26633200186.js	165 ms	138 ms	12 ms
kotlinlang.org/_next/static/chunks/0883b4f9.f93badb8ae74b3c8.js	153 ms	117 ms	15 ms
www.googletagmanager.com/gtag/js?id=G-9J976DJZ68&cx=c&gtm=4e6460	119 ms	90 ms	27 ms
scripts.clarity.ms/0.8.59/clarity.js	111 ms	93 ms	2.6 ms
kotlinlang.org/_next/static/chunks/framework-945b357d4a851f4b.js	102 ms	87 ms	7.2 ms
www.googletagmanager.com/gtm.js?id=GTM-NL29B334&gtm=4e6460	99 ms	77 ms	19 ms
kotlinlang.org/_next/static/chunks/ba4f7f0f.fa42d89b8c81cd7a.js	76 ms	58 ms	18 ms
kotlinlang.org/_next/static/chunks/pages/index-6bf78d87611424e9.js	65 ms	57 ms	8.1 ms
analytics.tiktok.com/i18n/pixel/static/main.MWE0ZWQ3ZWQwMA.js	59 ms	42 ms	15 ms
www.googletagmanager.com/gtag/js?id=G-M8TDRLXFQH&cx=c&gtm=4e6460	56 ms	42 ms	13 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	1.7 s
Other	282 ms
Script Parsing & Compilation	262 ms
Style & Layout	131 ms
Garbage Collection	40 ms
Rendering	29 ms
Parse HTML & CSS	23 ms

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

Estimated savings: 0.0 ms 7.6 KiB

URL	Transfer Size	Est Savings
/* BASICS / .CodeMirror { / Set height, width, borders, and global font properties here */ fo… } …	5.1 KiB	3.9 KiB
.executable-fragment-wrapper{margin-bottom:35px;position:relative} …	8.0 KiB	3.8 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 23.1 KiB

URL	Transfer Size	Est Savings
kotlinlang.org/_next/static/css/6b362df15a64b242.css	16.1 KiB	12.2 KiB
cdn.cookiehub.eu/c2/css/48464916.css	12.2 KiB	10.9 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
/_next/static/chunks/images/wide@1x-97ec69b23541691343d3a...	397.5 KiB
/_next/static/chunks/images/hero-3600-d09c50b3a9c0ba44d2d...	385.7 KiB
kotlinlang.org/_next/static/chunks/ba4f7f0f.fa42d89b8c81cd7a.js	226.8 KiB
www.googletagmanager.com/gtm.js?id=GTM-5P98	203.5 KiB
www.googletagmanager.com/gtag/js?id=G-9J976DJZ68&cx=c&gtm=4e6460	174.2 KiB
www.googletagmanager.com/gtm.js?id=GTM-NL29B334&gtm=4e6460	167.1 KiB
www.googletagmanager.com/gtag/js?id=AW-1071903267&cx=c&gtm=4e6460	146.4 KiB
www.googletagmanager.com/gtag/js?id=AW-963127096&cx=c&gtm=4e6460	146.4 KiB
kotlinlang.org/_next/static/chunks/0883b4f9.f93badb8ae74b3c8.js	143.6 KiB
www.googletagmanager.com/gtag/js?id=G-M8TDRLXFQH&cx=c&gtm=4e6460	142.9 KiB

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

	URL
div.index_videoWrapper__pTclA > div.ktl-youtube-player-module_youtube-player_aSb0a > div.ktl-youtube-player-module_preview_SuIdr > img.ktl-youtube-player-module_image-preview_qXCFf `div.index_videoWrapper__pTclA > div.ktl-youtube-player-module_youtube-player_aSb0a > div.ktl-youtube-player-module_preview_SuIdr > img.ktl-youtube-player-module_image-preview_qXCFf`	img.youtube.com/vi/JGvk4M0Rfxo/maxresdefault.jpg
KotlinConf banner `div.ktl-layout > a.kotlin-conf-banner_link__zMv9_ > picture > img.kotlin-conf-banner_image__yzSRR`	/_next/static/chunks/images/wide@1x-97ec69b23541691343d3a...
Gradle logo `div.foundation-preview_foundationPreview__7TrlB > div.foundation-preview_secondBlock__npr_1 > div.foundation-preview_companies__AnbeL > img.foundation-preview_companyLogo__miayx`	/_next/static/chunks/images/gradle-logo-90c75611ac7729f90...
div.ktl-layout > div.info-block_container__1_jl6 > div.info-block_item__lGaST > img `div.ktl-layout > div.info-block_container__1_jl6 > div.info-block_item__lGaST > img`	/_next/static/chunks/images/multiplatform-preview-7b3351f...
Kodee’s Kotlin Roundup: Kotlin 2.3.20, Interview With Josh Long, and More `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-1-c0b9fe17023a6388d98f6f...
Amper 0.10 – JDK Provisioning, a Maven Converter, Custom Compiler Plugins, and … `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-2-1c219af127c630afc917a4...
KotlinConf’26 Speakers: In Conversation With Lena Reinhard `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-0-142f049046b735e33a9f1f...
KotlinConf’26 Speakers: In Conversation with Josh Long `a.latest-news_item__3ilvX > div.latest-news_image__jLyHP > picture > img.latest-news_imageSrc___YbmI`	/_next/static/chunks/images/news-3-ed0d012b40f41528f3a2cd...

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

●Layout shift culprits

●Optimize DOM size

●LCP breakdown

●Modern HTTP

●Optimize viewport for mobile

●Minify JavaScript

●User Timing marks and measures 24 user timings

●Avoid long main-thread tasks 14 long tasks found

●Page didn't prevent back/forward cache restoration

●Network Requests

●Network Round Trip Times 210 ms

●Server Backend Latencies 640 ms

●Tasks

●Diagnostics

●Metrics

●Screenshot Thumbnails

●Final Screenshot

●Script Treemap Data

●Resources Summary

●Avoid multiple page redirects

●Avoid large layout shifts 2 layout shifts found

○INP breakdown

○Avoid non-composited animations

Accessibility

Names and labels

Labels ensure that form controls are announced properly by assistive technologies, like screen readers. Learn more about form element labels.

Failing Elements
div.code-area > div.CodeMirror > div > textarea `div.code-area > div.CodeMirror > div > textarea`

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

●`[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

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

●`[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 are distinguishable without relying on color.

●Links have a discernible name

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

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

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

●Touch targets have sufficient size and spacing.

●Heading elements appear in a sequentially-descending order

●Document has a main landmark.

●Deprecated ARIA roles were not used

●Identical links have the same purpose.

●Elements with visible text labels have matching accessible names.

○`[accesskey]` values are unique

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

○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

○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.

○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	snap.licdn.com/li.lms-analytics/insight.min.js

URL
kotlinlang.org/_next/static/chunks/ba4f7f0f.fa42d89b8c81cd7a.js

●Uses HTTPS

●Avoids third-party cookies

●Allows users to paste into input fields

●Avoids requesting the geolocation permission on page load

●Avoids requesting the notification permission on page load

●Displays images with correct aspect ratio

●Serves images with appropriate resolution

●Page has the HTML doctype

●Properly defines charset

●No browser errors logged to the console

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

●Ensure CSP is effective against XSS attacks

●Use a strong HSTS policy

●Ensure proper origin isolation with COOP

●Mitigate DOM-based XSS with Trusted Types

●Detected JavaScript libraries

○Redirects HTTP traffic to HTTPS

○Mitigate clickjacking with XFO or CSP

SEO

Content Best Practices

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

Link destination	Link Text
www.jetbrains.com/legal/docs/privacy/cookie-notice/	Learn more
kotlinlang.org/multiplatform/	Learn more
kotlinlang.org/server-side/	Learn more
kotlinlang.org/docs/android-overview.html	Learn more
kotlinlang.org/docs/kotlin-ai-apps-development-overview.html	Learn more

Format your HTML in a way that enables crawlers to better understand your app’s content.

○Structured data is valid

●Page isn’t blocked from indexing

●Document has a `<title>` element

●Document has a meta description

●Page has successful HTTP status code

●Links are crawlable

●robots.txt is valid

●Image elements have `[alt]` attributes

●Document has a valid `hreflang`

●Document has a valid `rel=canonical`

Browse & Analyze

Learn

Results for https://kotlinlang.org

Site Health

Top Priorities (5)

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Best Practices

General

SEO

Content Best Practices

Lighthouse Scores

Core Web Vitals

Detailed Report

Performance

Insights

Diagnostics

Accessibility

Names and labels

Best Practices

General

SEO

Content Best Practices

Keyboard Shortcuts