🦖 RTCDataChannelStats: state property
🟧 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 […]

🦖 Range: detach() method
🟧 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

🦖 CookieStore: set() method
☑️ 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

🦖 HTMLCanvasElement: webglcontextcreationerror event
✅ 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 […]

🦖 CSSStyleSheet: deleteRule() method
✅ 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

🦖 skewX()
✅ 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 data […]

🦖 UIEvent 🦖

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

🦖 SVGPreserveAspectRatio: align property
✅ 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 […]

🦖 XMLHttpRequestEventTarget: error event 🦖

https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequestEventTarget/error_event

The error event is fired when the request encountered an error.

#webdev

🦖 Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers' 🦖

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 […]

🦖 CredentialsContainer
✅ 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 […]

🦖 UserActivation
☑️ Newly available (from Nov 2023)

https://developer.mozilla.org/en-US/docs/Web/API/UserActivation

The UserActivation interface provides information about whether a user is currently interacting with the page, or has completed an interaction since page load.

#webdev

🦖 HTML nonce global attribute
✅ Widely available (from Mar 2022)

https://developer.mozilla.org/en-US/docs/Web/HTML/Reference/Global_attributes/nonce

The nonce global attribute is a content attribute defining a cryptographic nonce ("number used once") which can be used by Content Security […]

🦖 DelegatedInkTrailPresenter: updateInkTrailStartPoint() method
🟧 Limited availability

https://developer.mozilla.org/en-US/docs/Web/API/DelegatedInkTrailPresenter/updateInkTrailStartPoint

The updateInkTrailStartPoint() method of the DelegatedInkTrailPresenter interface indicates which […]