mdn

mdn/content

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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100 Open Issues Need Help Last updated: Jul 8, 2026

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Temporal.ZonedDateTime.prototype.add(): incorrect example for offset ambiguity resolution during fall-back DST transition 5 days ago
help wanted Content:JS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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#css#documentation#html#http#javascript#learning#mdn#reference#web-development#web-standards
Incorrect example for `\q{}` in regular expression character class 21 days ago
help wanted Content:JS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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The link target of the "rotate" attribute of SVG <text> element looks improper 22 days ago
help wanted Content:SVG
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Mention Firefox Anti-fingerprinting on `getImageData()` page 23 days ago
help wanted Content:WebAPI
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Misleading sentence in dispatchEvent() page 27 days ago
good first issue Content:WebAPI
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Explain SVG geometry properties about 1 month ago
help wanted Content:SVG
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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[CSS] Add documentation for `grid-lanes` and `inline-grid-lanes` about 1 month ago
help wanted Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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document.frames doesn't exist about 1 month ago
good first issue Content:WebAPI
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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wrong CC value for table "AVC profiles" about 1 month ago
good first issue Content:Media
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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showNotification: clarify difference between badge, icon, and image about 1 month ago
help wanted Content:WebAPI area: Notifications
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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HTMLButtonElement - setCustomValidity(): Specify button type availability about 1 month ago
help wanted Content:WebAPI
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Issue with AggregateError: Link Polyfill of AggregateError in core-js points to wrong anchor about 2 months ago
good first issue Content:JS
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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font-size-adjust: Add note about scaling behavior of font family weights and styles about 2 months ago
help wanted Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Outdated note about non-support 2 months ago
good first issue Content:SVG goal: up-to-date
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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HTTP Headers overview links to non-documented Signature headers 2 months ago
good first issue Content:HTTP
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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onCommand: Add tab - add example 2 months ago
help wanted Content:WebExt
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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WebTransport serverCertificateHashes value can't be string 2 months ago
help wanted Content:WebAPI
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Native Messaging documentation can be more explicit about the location of application manifest 2 months ago
help wanted Content:WebExt p2
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Specificity is not an algorithm 2 months ago
help wanted Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Stylesheet Definition in Glossary 2 months ago
help wanted Content:Glossary
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WebTransport server implementation 2 months ago
help wanted Content:WebAPI document not written area: WebTransport
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Native Messaging add-on tutorial does not specify how to view console output. 3 months ago
help wanted Content:WebExt
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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wrong method in example 3 months ago
good first issue Content:WebAPI
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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audioData.copyTo is missing format option 3 months ago
help wanted Content:WebAPI area: Web Audio
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Wording around DynamicsCompressorNode use-cases is oversimplified / partially misleading 3 months ago
help wanted Content:WebAPI area: Web Audio
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Example should make it clear only one thing is replaced for strings 3 months ago
good first issue Content:JS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Service Worker navigation preload sample code error 3 months ago
help wanted Content:WebAPI
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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ESLint (in)compatibilities have changed 3 months ago
help wanted Content:Learn:Client-side
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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"Document: exitPictureInPicture() method" Examples has a problem 3 months ago
good first issue Content:WebAPI
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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RTCEncodedVideoFrame type is now EncodedVideoChunkType, which does not allow "empty" as a value 3 months ago
help wanted Content:WebAPI area: WebRTC
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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include_subdomains description for NEL header is inaccurate 3 months ago
help wanted Content:HTTP
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Removing or reducing legacy info on Firefox UA string reference 3 months ago
help wanted Content:HTTP
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Code example and instructions differ 3 months ago
good first issue Content:Games
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Add missing Wasm docs: Table instructions 3 months ago
help wanted document not written Content:wasm
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Typo "order-style" should be border-style 3 months ago
good first issue Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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`CanvasRenderingContext2D.canvas` can't be null 4 months ago
good first issue Content:WebAPI
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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NEXT Button not working properly 4 months ago
good first issue Content:Learn:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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[Grammer issue] 4 months ago
good first issue Content:Learn:Django
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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#css#documentation#html#http#javascript#learning#mdn#reference#web-development#web-standards
Block flow direction does not depend on inline direction 4 months ago
help wanted Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Writing mode example uses wrong script 4 months ago
help wanted Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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lexical `this` is mentioned but the associated example doesn't demonstrate it 4 months ago
help wanted Content:WebAPI
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Mobile and desktop parity for the select element 4 months ago
help wanted Content:HTML goal: up-to-date
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Document accessibility considerations for Custom Highlight API 4 months ago
help wanted Content:WebAPI goal: best practices
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Clarify image.decode() failure on lazy-loaded images 4 months ago
help wanted Content:WebAPI area: DOM/CSSOM
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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:target-current is no longer limited to just `::scroll-marker`s 4 months ago
help wanted Content:CSS goal: up-to-date
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Clarify 'extractable' parameter behavior when 'SubtleCrypto.generateKey' is used with asymmetric key algorithms 4 months ago
help wanted Content:WebAPI area: Web Crypto goal: clarity
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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lang attribute does not default to empty string 4 months ago
help wanted Content:HTML goal: accuracy
mdn/content
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offsetParent is not always null for position: fixed elements 4 months ago
help wanted Content:WebAPI
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Change arguments to CookieStoreManager's subscribe method 4 months ago
help wanted Content:WebAPI effort: small accepting PR
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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setHTML() / Sanitizer explictly call out that re-parsing (mXSS) is still a danger 4 months ago
help wanted Content:WebAPI
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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`Document.querySelector()` vs. `Element.querySelector()` 4 months ago
good first issue Content:WebAPI
mdn/content
10.9K

The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Update Masonry layout guide for css-grid-3 "Masonry Switch Syntax" changes 4 months ago
help wanted Content:CSS goal: up-to-date
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Document position-visibility: anchors-valid 5 months ago
help wanted Content:CSS goal: up-to-date
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Typo of element id on "Setting a named scroll progress timeline" example section 5 months ago
good first issue Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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<absolute-size> Specification link is incorrect 5 months ago
good first issue Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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The description about `break-before: always` looks wrong 5 months ago
good first issue Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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How to build custom form controls: JS example is not accessible 5 months ago
help wanted Content:Learn:Forms
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"Each property name before colons is an identifier (either a name, a number, or a string literal)" 5 months ago
good first issue Content:JS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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`<pre readonly>` in section "Event handlers" 5 months ago
good first issue Content:Learn:JavaScript
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Inaccurate info in "Example 1" on creating new stacking context 5 months ago
help wanted Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Misleading "Example 3" about stacking context 5 months ago
help wanted Content:CSS goal: clarity
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Topic on setting HTTP priority of resource requests 5 months ago
help wanted document not written Content:Performance
mdn/content
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Inaccurate info in example on creating new stacking context 5 months ago
help wanted Content:CSS
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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Add accessibility considerations to the HTML "autocomplete" attribute page 5 months ago
help wanted Content:HTML
mdn/content
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Confusing/misleading example 5 months ago
help wanted Content:CSS
mdn/content
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Dialog closure via Escape key now triggers close event 6 months ago
help wanted Content:HTML
mdn/content
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The official source for MDN Web Docs content. Home to over 14,000 pages of documentation about HTML, CSS, JS, HTTP, Web APIs, and more.

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remove can indeed trigger blur 6 months ago
help wanted Content:WebAPI
mdn/content
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Fix grammar errors in Web Audio API and HTML Table Element documentation 6 months ago
good first issue Content:WebAPI
mdn/content
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(voice-change-o-matic) Documentation? How to add new voice filters? 6 months ago
help wanted needs triage
mdn/content
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css carousels example lacks accessible names for scroll markers 6 months ago
help wanted Content:CSS goal: best practices
mdn/content
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Add explanation that CSS background propagate from `body` to `html` 6 months ago
help wanted Content:CSS
mdn/content
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Need clarification on the "more info" icon usage in relation to tooltip 6 months ago
help wanted Content:Accessibility
mdn/content
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The definition role does not permit aria-labelledby 6 months ago
help wanted Content:Accessibility
mdn/content
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missing info about specifying multiple properties 6 months ago
help wanted Content:CSS
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Range interface documentation has incorrect inheritance description 6 months ago
good first issue Content:WebAPI
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Body and semantic information differ between GET and DELETE requests 6 months ago
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WebAuthn conditional create is not documented 6 months ago
help wanted Content:WebAPI document not written area: WebAuthn
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Event timeStamp accuracy description is misleading 6 months ago
help wanted Content:WebAPI
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Regular Expression Guide, page on Groups and Backreferences: "Types" section suggests wrong syntax for "Modifier" ("local flags") 6 months ago
good first issue Content:JS
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Small error with HTML input type image 6 months ago
good first issue Content:HTML
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Mention the "command" attribute of buttons 7 months ago
help wanted Content:HTML effort: medium
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Poor choice of canvas id 7 months ago
good first issue Content:WebAPI accepting PR
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atan2() calculation always returns an <angle> in degrees, not radians 7 months ago

AI Summary: The user reports that the MDN documentation for `atan2()` incorrectly states it returns a number of radians. Based on their testing, the function appears to return an `<angle>` value in degrees, as converting its output from radians to degrees yields an incorrect result. The issue suggests the documentation needs to be updated to reflect that `atan2()` returns degrees.

Complexity: 1/5
good first issue Content:CSS
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WebGLRenderingContext bufferSubData documents too many parameters 7 months ago
help wanted Content:WebAPI area: WebGL
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Missing glossary for cryptographic `nonce` 7 months ago

AI Summary: The user reports a missing glossary entry for the term "cryptographic `nonce`" on MDN. They expect to find a definition for this term and provide a Wikipedia link as a reference. This issue requests the addition of a new glossary entry to address this gap in documentation.

Complexity: 2/5
good first issue help wanted accepting PR
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Correct Calculation 7 months ago
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Navigation reload: Mention that soft reloads don't fire popstate 7 months ago
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<aside> implicit role="complementary" is conditional 7 months ago
help wanted Content:HTML Content:Accessibility
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CSS Anchor Positioning: anchor-scope documentation missing 7 months ago
help wanted Content:CSS document not written goal: up-to-date goal: completeness
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Outputs of how CSS process whitespace seems to be incorrect 7 months ago
good first issue Content:CSS
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HTMLLinkElement.sizes example should not use PNG 8 months ago
good first issue Content:WebAPI
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Unclear formatting in 'Dealing with files' 8 months ago
good first issue Content:Learn
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Mistake 8 months ago
good first issue Content:JS
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Range syntax for style queries 8 months ago
help wanted Content:CSS
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Provide a better description for CompressionStream: readable property 8 months ago
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Typos in Glossary/Percent-encoding 8 months ago
good first issue Content:Glossary
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Missing word in 'The web standards model' 8 months ago
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Lack of an example for 'Domain name' in the Glossary 8 months ago
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Mix up of links for WebAuthn authenticator responses 8 months ago
good first issue Content:WebAPI area: WebAuthn
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Visual studio code url is inaccurate 8 months ago
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