Firefox 150 release notes for developers (Beta)

Changes for web developers

APIs

DOM

• The options.shadowRoots argument of the Document.caretPositionFromPoint() method is now supported. This allows the method to return the node containing the caret from within a shadow DOM, provided its associated ShadowRoot was passed as an option. (Firefox bug 1914596).

• The CSSFontFaceDescriptors interface is now supported, and an instance of this type is returned by the CSSFontFaceRule.style property. (Firefox bug 2019904).

• The non-standard caretRangeFromPoint() method of the Document interface is now supported. (Firefox bug 1550635).

• The ariaNotify() method is now supported on Document and Element. This queues a string of text to be announced by a screen reader, providing a more ergonomic and reliable alternative to ARIA live regions. (Firefox bug 2018095).

Changes for add-on developers

Experimental web features

These features are shipping in Firefox 150 but are disabled by default. To experiment with them, search for the appropriate preference on the about:config page and set it to true. You can find more such features on the Experimental features page.