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Honorable mentions:
- @stefan: twitter bot original
- @jaandrle
[bridged from https://front-end.social/@randomMDN on the fediverse by https://fed.brid.gy/ ]
✅ Widely available (from Sept 2015)
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet/has
The has() method of WeakSet instances returns a boolean indicating whether the specified value exists in this WeakSet or not.
#webdev […]
✅ Widely available (from Sept 2015)
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/WeakSet/has
The has() method of WeakSet instances returns a boolean indicating whether the specified value exists in this WeakSet or not.
#webdev […]
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/PresentationConnection
The PresentationConnection interface of the Presentation API provides methods and properties for managing a single presentation. Each presentation connection is represented […]
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/PresentationConnection
The PresentationConnection interface of the Presentation API provides methods and properties for managing a single presentation. Each presentation connection is represented […]
✅ Widely available (from Nov 2015)
https://developer.mozilla.org/en-US/docs/Web/API/HTMLMeterElement/low
The low property of the HTMLMeterElement interface represents the low boundary of the
✅ Widely available (from Nov 2015)
https://developer.mozilla.org/en-US/docs/Web/API/HTMLMeterElement/low
The low property of the HTMLMeterElement interface represents the low boundary of the
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope/clearTimeout
The clearTimeout() method of the WorkerGlobalScope interface cancels a timeout previously established by calling WorkerGlobalScope […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope/clearTimeout
The clearTimeout() method of the WorkerGlobalScope interface cancels a timeout previously established by calling WorkerGlobalScope […]
✅ Widely available (from Sept 2020)
https://developer.mozilla.org/en-US/docs/Web/API/AudioScheduledSourceNode/stop
The stop() method on AudioScheduledSourceNode schedules a sound to cease playback at the specified time. If no time is specified, then […]
✅ Widely available (from Sept 2020)
https://developer.mozilla.org/en-US/docs/Web/API/AudioScheduledSourceNode/stop
The stop() method on AudioScheduledSourceNode schedules a sound to cease playback at the specified time. If no time is specified, then […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/HTMLAnchorElement/pathname
The HTMLAnchorElement.pathname property is a string containing an initial '/' followed by the path of the URL not including the query string or […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/HTMLAnchorElement/pathname
The HTMLAnchorElement.pathname property is a string containing an initial '/' followed by the path of the URL not including the query string or […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/Document/DOMContentLoaded_event
The DOMContentLoaded event fires when the HTML document has been completely parsed, and all deferred scripts (
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope/setInterval
The setInterval() method of the WorkerGlobalScope interface repeatedly calls a function or executes a code snippet, with a fixed time […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/WorkerGlobalScope/setInterval
The setInterval() method of the WorkerGlobalScope interface repeatedly calls a function or executes a code snippet, with a fixed time […]
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/HighlightRegistry/highlightsFromPoint
The highlightsFromPoint() method of the HighlightRegistry interface returns an array of objects representing the custom highlights […]
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/HighlightRegistry/highlightsFromPoint
The highlightsFromPoint() method of the HighlightRegistry interface returns an array of objects representing the custom highlights […]
✅ Widely available (from Mar 2023)
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/acos
The acos() CSS function is a trigonometric function that returns the inverse cosine of a number between -1 and 1. The function contains a single calculation that returns the […]
✅ Widely available (from Mar 2023)
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/acos
The acos() CSS function is a trigonometric function that returns the inverse cosine of a number between -1 and 1. The function contains a single calculation that returns the […]
✅ Widely available (from Sept 2021)
https://developer.mozilla.org/en-US/docs/Web/API/ImageBitmap/height
The ImageBitmap.height read-only property returns the ImageBitmap object's height in CSS pixels.
#webdev
✅ Widely available (from Sept 2021)
https://developer.mozilla.org/en-US/docs/Web/API/ImageBitmap/height
The ImageBitmap.height read-only property returns the ImageBitmap object's height in CSS pixels.
#webdev
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/HTMLTextAreaElement/readOnly
The readOnly property of the HTMLTextAreaElement interface indicates that the user cannot modify the value of the control. Unlike the […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/HTMLTextAreaElement/readOnly
The readOnly property of the HTMLTextAreaElement interface indicates that the user cannot modify the value of the control. Unlike the […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Elements/iframe
The
#webdev #html
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Referer
The HTTP Referer request header contains the absolute or partial address from which a resource has been requested. The Referer header allows a server to identify […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Referer
The HTTP Referer request header contains the absolute or partial address from which a resource has been requested. The Referer header allows a server to identify […]
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/RTCDataChannelStats/state
The state property of the RTCDataChannelStats dictionary returns a string that indicates the readyState of the data channel's underlying data connection […]
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/RTCDataChannelStats/state
The state property of the RTCDataChannelStats dictionary returns a string that indicates the readyState of the data channel's underlying data connection […]
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/Range/detach
The Range.detach() method does nothing. It used to disable the Range object and enable the browser to release associated resources. The method has been kept for compatibility.
#webdev
🟧 Limited availability
https://developer.mozilla.org/en-US/docs/Web/API/Range/detach
The Range.detach() method does nothing. It used to disable the Range object and enable the browser to release associated resources. The method has been kept for compatibility.
#webdev
☑️ Newly available (from Jun 2025)
https://developer.mozilla.org/en-US/docs/Web/API/CookieStore/set
The set() method of the CookieStore interface sets a cookie with the given name and value or options object.
#webdev
☑️ Newly available (from Jun 2025)
https://developer.mozilla.org/en-US/docs/Web/API/CookieStore/set
The set() method of the CookieStore interface sets a cookie with the given name and value or options object.
#webdev
✅ Widely available (from Sept 2016)
https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/webglcontextcreationerror_event
The webglcontextcreationerror event of the WebGL API is fired if the user agent is unable to create a […]
✅ Widely available (from Sept 2016)
https://developer.mozilla.org/en-US/docs/Web/API/HTMLCanvasElement/webglcontextcreationerror_event
The webglcontextcreationerror event of the WebGL API is fired if the user agent is unable to create a […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet/deleteRule
The CSSStyleSheet method deleteRule() removes a rule from the stylesheet object.
#webdev
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleSheet/deleteRule
The CSSStyleSheet method deleteRule() removes a rule from the stylesheet object.
#webdev
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/transform-function/skewX
The skewX() CSS function defines a transformation that skews an element in the horizontal direction on the 2D plane. Its result is a
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/Values/transform-function/skewX
The skewX() CSS function defines a transformation that skews an element in the horizontal direction on the 2D plane. Its result is a
https://developer.mozilla.org/en-US/docs/Web/API/UIEvent
The UIEvent interface represents simple user interface events. It is part of the UI Events API, which includes various event types and interfaces related to user interactions.
#webdev
https://developer.mozilla.org/en-US/docs/Web/API/UIEvent
The UIEvent interface represents simple user interface events. It is part of the UI Events API, which includes various event types and interfaces related to user interactions.
#webdev
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/SVGPreserveAspectRatio/align
The align read-only property of the SVGPreserveAspectRatio interface reflects the type of the alignment value as specified by one of the […]
✅ Widely available (from Jul 2015)
https://developer.mozilla.org/en-US/docs/Web/API/SVGPreserveAspectRatio/align
The align read-only property of the SVGPreserveAspectRatio interface reflects the type of the alignment value as specified by one of the […]
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequestEventTarget/error_event
The error event is fired when the request encountered an error.
#webdev
https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequestEventTarget/error_event
The error event is fired when the request encountered an error.
#webdev
https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSInvalidAllowHeader
The response to the CORS request that was sent by the server includes an Access-Control-Allow-Headers header which includes […]
https://developer.mozilla.org/en-US/docs/Web/HTTP/Guides/CORS/Errors/CORSInvalidAllowHeader
The response to the CORS request that was sent by the server includes an Access-Control-Allow-Headers header which includes […]
✅ Widely available (from Sept 2019)
https://developer.mozilla.org/en-US/docs/Web/API/CredentialsContainer
The CredentialsContainer interface of the Credential Management API exposes methods to request credentials and notify the user agent when events such as successful […]
✅ Widely available (from Sept 2019)
https://developer.mozilla.org/en-US/docs/Web/API/CredentialsContainer
The CredentialsContainer interface of the Credential Management API exposes methods to request credentials and notify the user agent when events such as successful […]
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