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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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100 Open Issues Need Help Last updated: Feb 21, 2026

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The description about `break-before: always` looks wrong about 1 hour ago

AI Summary: This GitHub issue reports a factual error in the MDN documentation for the CSS property `break-before: always`. The current description incorrectly states it forces a page break "right after" the principal box, when it should be "right before" according to the CSS specification. The user provides a link to the relevant section of the CSS Break Module Level 4 spec as evidence.

Complexity: 1/5

good first issue Content:CSS

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How to build custom form controls: JS example is not accessible 4 days 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)" 9 days ago

good first issue Content:JS

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`<pre readonly>` in section "Event handlers" 10 days ago

good first issue Content:Learn:JavaScript

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Inaccurate info in "Example 1" on creating new stacking context 17 days ago

help wanted Content:CSS

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Misleading "Example 3" about stacking context 17 days ago

help wanted Content:CSS goal: clarity

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Topic on setting HTTP priority of resource requests 17 days ago

help wanted document not written Content:Performance

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Inaccurate info in example on creating new stacking context 19 days ago

help wanted Content:CSS

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Add accessibility considerations to the HTML "autocomplete" attribute page 21 days ago

help wanted Content:HTML

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Confusing/misleading example 21 days ago

help wanted Content:CSS

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Update Masonry layout guide for css-grid-3 "Masonry Switch Syntax" changes 21 days ago

help wanted Content:CSS goal: up-to-date

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Dialog closure via Escape key now triggers close event 22 days ago

help wanted Content:HTML

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remove can indeed trigger blur 23 days ago

help wanted Content:WebAPI

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HTMLButtonElement - setCustomValidity(): Specify button type availability 26 days ago

help wanted Content:WebAPI

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Fix grammar errors in Web Audio API and HTML Table Element documentation 27 days ago

good first issue Content:WebAPI

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(voice-change-o-matic) Documentation? How to add new voice filters? about 1 month ago

help wanted needs triage

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css carousels example lacks accessible names for scroll markers about 1 month ago

help wanted Content:CSS goal: best practices

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Add explanation that CSS background propagate from `body` to `html` about 1 month ago

help wanted Content:CSS

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Need clarification on the "more info" icon usage in relation to tooltip about 1 month ago

help wanted Content:Accessibility

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The definition role does not permit aria-labelledby about 1 month ago

help wanted Content:Accessibility

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missing info about specifying multiple properties about 1 month ago

help wanted Content:CSS

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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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Range interface documentation has incorrect inheritance description about 1 month ago

good first issue Content:WebAPI

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Body and semantic information differ between GET and DELETE requests about 1 month ago

help wanted Content:HTTP

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WebAuthn conditional create is not documented about 1 month ago

help wanted Content:WebAPI document not written area: WebAuthn

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Event timeStamp accuracy description is misleading about 2 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") about 2 months ago

good first issue Content:JS

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Small error with HTML input type image about 2 months ago

good first issue Content:HTML

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Mention the "command" attribute of buttons 2 months ago

help wanted Content:HTML effort: medium

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Poor choice of canvas id 2 months ago

good first issue Content:WebAPI accepting PR

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atan2() calculation always returns an <angle> in degrees, not radians 2 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 2 months ago

help wanted Content:WebAPI area: WebGL

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Missing glossary for cryptographic `nonce` 2 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 2 months ago

good first issue accepting PR

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Navigation reload: Mention that soft reloads don't fire popstate 2 months ago

help wanted Content:WebAPI

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<aside> implicit role="complementary" is conditional 3 months ago

help wanted Content:HTML Content:Accessibility

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CSS Anchor Positioning: anchor-scope documentation missing 3 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 3 months ago

good first issue Content:CSS

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HTMLLinkElement.sizes example should not use PNG 3 months ago

good first issue Content:WebAPI

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Unclear formatting in 'Dealing with files' 3 months ago

good first issue Content:Learn

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Mistake 3 months ago

good first issue Content:JS

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Range syntax for style queries 3 months ago

help wanted Content:CSS

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Provide a better description for CompressionStream: readable property 3 months ago

help wanted Content:WebAPI

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Typos in Glossary/Percent-encoding 3 months ago

good first issue Content:Glossary

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Missing word in 'The web standards model' 3 months ago

good first issue Content:Learn accepting PR

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Lack of an example for 'Domain name' in the Glossary 3 months ago

good first issue Content:Glossary

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Mix up of links for WebAuthn authenticator responses 3 months ago

good first issue Content:WebAPI area: WebAuthn

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Visual studio code url is inaccurate 3 months ago

good first issue Content:Learn

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Outdated link included in "See also" 3 months ago

AI Summary: The MDN documentation for `input type="number"` includes an outdated link in its "See also" section to a 2020 Gov.UK blog post. This article references long-fixed accessibility bugs in very old Safari versions and describes a scroll-wheel behavior for number inputs that is no longer accurate in modern browsers, making the information misleading.

Complexity: 1/5

good first issue Content:HTML

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Expected behavior - confuse text at Closures 4 months ago

good first issue Content:JS

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X-Content-Type-Options is missing the influence on sniffing documents (HTML) 4 months ago

help wanted Content:HTTP

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cloneNode parameter default value 4 months ago

AI Summary: The MDN documentation for `Node.cloneNode()` is incomplete regarding its `deep` parameter. While it explains the behavior for `true` and `false`, it fails to specify what happens when the optional parameter is omitted. The user suggests adding information that omitting the parameter defaults to `false`, referencing the DOM spec.

Complexity: 1/5

good first issue Content:WebAPI area: DOM/CSSOM

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Incorrect transparent content category definition 4 months ago

help wanted Content:HTML

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Map.prototype.has() refers to WeakMap instead of Map instance 4 months ago

good first issue Content:JS

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Clarify what is removed by default by `setHTML()` 4 months ago

good first issue Content:WebAPI

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some of the examples are throwing the error `Uncaught TypeError: Sanitizer constructor: 'new' is required` 4 months ago

AI Summary: The MDN documentation for the HTML Sanitizer API contains incorrect JavaScript examples. Some code snippets are missing the `new` keyword when instantiating the `Sanitizer` object, causing a `TypeError` in browsers like Firefox Nightly. The issue requests that all examples be updated to correctly use `new Sanitizer(...)`.

Complexity: 1/5

good first issue Content:WebAPI

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Firefox doesn't support container style queries 4 months ago

good first issue Content:CSS

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Update `container-type` note about layout containment 4 months ago

good first issue Content:CSS goal: up-to-date

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Missing Information: inert cannot be reverted by a descendant 4 months ago

help wanted Content:HTML

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mediaconstrtraints video.deviceid no longer obeys 'ideal' device constraints on chromium-based browsers 4 months ago

help wanted Content:WebAPI area: MediaStreams

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Unnecessary use of roles in aria basics article 4 months ago

help wanted Content:Learn:Accessibility

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FedCM: An approved_clients entry in the accounts list is required for auto reauthentication to work 4 months ago

help wanted Content:WebAPI area: WebAuthn

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mention negative delays for setTimeout 4 months ago

AI Summary: The user reports that the MDN documentation for `setTimeout` is incomplete regarding its `delay` parameter. Specifically, it doesn't mention how negative delay values are handled. The user suggests adding a clarification that negative delays are treated as 0, causing the function to execute in the next event cycle, and provides a link to the HTML specification as a reference.

Complexity: 1/5

good first issue Content:WebAPI

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Docs & Compat data for referrer-policy() & cross-origin() URL modifiers 4 months ago

help wanted Content:CSS needs BCD update

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CSS example has type incompatibility 5 months ago

help wanted Content:CSS

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<figcaption> provides accessible name, not description 5 months ago

AI Summary: The MDN documentation for the `<figcaption>` element incorrectly states that it provides an "accessible description" for its parent `<figure>` element. The issue submitter argues that `<figcaption>` actually provides an "accessible name" for the `<figure>`, which is a more accurate accessibility term for its primary labeling function.

Complexity: 2/5

good first issue Content:HTML

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Cache management through ETAGs in bfcache documentation 5 months ago

help wanted document not written Content:Performance

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Sticky user activation (incorrectly?) notes "moved a mouse" 5 months ago

help wanted Content:Glossary

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Possible typo in glossary entry: "schema" vs "scheme" 5 months ago

good first issue Content:Glossary

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Add a note to discourage the abuse of `system-ui` in articles, documents, and blogs 5 months ago

help wanted Content:CSS

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Typo in glossary entry 5 months ago

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Key values for keyboard events: outdated compatibility notes 5 months ago

good first issue Content:WebAPI area: UI Events accepting PR

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Live Regions accessibility considerations 5 months ago

help wanted effort: medium Content:Accessibility accepting PR

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Double checking the gamepad docs are correct 5 months ago

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indexedDB.deleteDatabase doc: Mention that deleting a database isn't completed until the upgradeNeeded result is closed 5 months ago

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multiple keyPath index (array index) should be explained, because of it's common usage but is not. 5 months ago

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misuse of aria-label in "How to structure a web form" doc 5 months ago

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Update sticky activation docs for new spec changes to carry across pages 5 months ago

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Popover API needs Accessibility Info 5 months ago

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feGaussianBlur needs guidance about setting height and width 5 months ago

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Javascript Reference: Short-circuiting example is a bit confusing 5 months ago

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Reference for CSS value serialization, especially as it relates to colors 5 months ago

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mix-blend-mode does not blend the element with its background but with its backdrop 5 months ago

help wanted Content:CSS goal: accuracy

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[CSS] demo for font-variant-numeric does not show all values 5 months ago

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aria-label list of prohibited roles not correctly sorted 5 months ago

AI Summary: The MDN documentation page for `aria-label` contains a list of 'prohibited roles' that is intended to be alphabetically sorted but is currently out of order. The issue points to the specific file and line range where the correction is needed.

Complexity: 1/5

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Old reference in Javascript Guide 5 months ago

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Misclassification: Node.textContent listed as a “method” (should be a property) 5 months ago

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Guide on reflow and performance optimizations 5 months ago

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Document js-types WebAssembly proposal 5 months ago

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Bad grammar 5 months ago

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URL standard update: opaque paths cannot have trailing space 5 months ago

help wanted Content:WebAPI area: URL/URLPattern needs BCD update

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font-family: emoji is no longer on a standards track 5 months ago

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Recommend manipulating classList for adding class 5 months ago

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Miscalculation/typo 5 months ago

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"SVGSVGElement.viewBox.baseVal": when viewBox unset, it is null in FF but a 0-SVGRect in Chrome 6 months ago

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Add missing Wasm docs: Vector/SIMD instructions 6 months ago

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Add missing Wasm docs: Reference instructions 6 months ago

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Add missing Wasm docs: Table instructions 6 months ago

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Typo "outputted" in Command line crash course 6 months ago

AI Summary: This GitHub issue reports a grammatical error in the MDN "Command line crash course" article, specifically the use of "outputted" instead of "output" for the past tense. The user also briefly notes the incorrect verb usage of "to architect" and expects correct English.

Complexity: 1/5

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list-style-position: HTML error in example 6 months ago

AI Summary: This GitHub issue reports an HTML error in an example on the MDN page for `list-style-position`. The example code incorrectly places plain text directly inside a `<ul>` element, outside of an `<li>` tag, which is invalid HTML. The expected fix is to ensure all content within a `<ul>` is properly wrapped in `<li>` tags.

Complexity: 1/5

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