Sourced from jsdom's releases.

Version 26.1.0

• Added at least partial support for various SVG elements and their classes: <defs> (SVGDefsElement), <desc> (SVGDescElement), <g> (SVGGElement), <metadata> (SVGMetadataElement), <switch> (SVGSwitchElement), and <symbol> (SVGSymbolElement).
• Added SVGAnimatedPreserveAspectRatio and SVGAnimatedRect, including support in the reflection layer.
• Added the SVGSVGElement createSVGRect() method, and the SVGRect type (which is distinct from DOMRect.)
• Added indexed property support to HTMLFormElement.
• Updated the SVGElement viewportElement() method to correctly establish the viewport based on ancestor elements.
• Removed the now-bloated form-data dependency in favor of our own smaller implementation of multipart/form-data serialization. No functional changes are expected.
• Various performance improvements, caches, microoptimizations, and deferred object creation.

Version 26.0.0

Breaking change: canvas peer dependency requirement has been upgraded from v2 to v3. (sebastianwachter)

Other changes:

• Added AbortSignal.any(). (jdbevan)
• Added initial support for form-associated custom elements, in particular making them labelable and supporting the ElementInternals labels property. The form-associated callbacks are not yet supported. (hesxenon)
• Updated whatwg-url, adding support for URL.parse().
• Updated cssstyle and rrweb-cssom, to improve CSS parsing capabilities.
• Updated nwsapi, improving CSS selector matching.
• Updated parse5, fixing a bug around <noframes> elements and HTML entity decoding.
• Fixed JSDOM.fromURL() to properly reject the returned promise if the server redirects to an invalid URL, instead of causing an uncaught exception.

Version 25.0.1

• Updated dependencies, notably tough-cookie, which no longer prints a deprecation warning.

Version 25.0.0

This major release changes the prototype of a jsdom's EventTarget.prototype to point to the Object.prototype inside the jsdom, instead of pointing to the Node.js Object.prototype. Thus, the prototype chain of Window stays entirely within the jsdom, never crossing over into the Node.js realm.

This only occurs when runScripts is set to non-default values of "dangerously" or "outside-only", as with the default value, there is no separate Object.prototype inside the jsdom.

This will likely not impact many programs, but could cause some changes in instanceof behavior, and so out of an abundance of caution, we're releasing it as a new major version.

Version 24.1.3

• Fixed calls to postMessage() that were done as a bare property (i.e., postMessage() instead of window.postMessage()).

Version 24.1.2

• Fixed an issue with the in operator applied to EventTarget methods, e.g. 'addEventListener' in window, which only appeared in Node.js ≥22.5.0. (legendecas)
• Fixed the events fired by blur(): it no longer fires focus and focusin on the Document, and blur and focusout no longer have their relatedTarget property set. (asamuzaK)

Version 24.1.1

• Fixed selection methods to trigger the selectionchange event on the Document object. (piotr-oles)

Version 24.1.0

• Added the getSetCookie() method to the Headers class. (ushiboy)
• Fixed the creation and parsing of elements with names from Object.prototype, like "constructor" or "toString".
• Updated rweb-cssom, which can now parse additional CSS constructs.

Version 24.0.0

This release reverts our selector engine back to nwsapi. As discussed in #3659, the performance regressions from @asamuzakjp/dom-selector turned out to be higher than anticipated. In the future, we can revisit @asamuzakjp/dom-selector after it reaches nwsapi's performance on the two real-world benchmarks provided by the community.

... (truncated)

Sourced from jsdom's changelog.

26.1.0

• Added at least partial support for various SVG elements and their classes: <defs> (SVGDefsElement), <desc> (SVGDescElement), <g> (SVGGElement), <metadata> (SVGMetadataElement), <switch> (SVGSwitchElement), and <symbol> (SVGSymbolElement).
• Added SVGAnimatedPreserveAspectRatio and SVGAnimatedRect, including support in the reflection layer.
• Added the SVGSVGElement createSVGRect() method, and the SVGRect type (which is distinct from DOMRect.)
• Added indexed property support to HTMLFormElement.
• Updated the SVGElement viewportElement() method to correctly establish the viewport based on ancestor elements.
• Removed the now-bloated form-data dependency in favor of our own smaller implementation of multipart/form-data serialization. No functional changes are expected.
• Various performance improvements, caches, microoptimizations, and deferred object creation.

26.0.0

Breaking change: canvas peer dependency requirement has been upgraded from v2 to v3. (sebastianwachter)

Other changes:

• Added AbortSignal.any(). (jdbevan)
• Added initial support for form-associated custom elements, in particular making them labelable and supporting the ElementInternals labels property. The form-associated callbacks are not yet supported. (hesxenon)
• Updated whatwg-url, adding support for URL.parse().
• Updated cssstyle and rrweb-cssom, to improve CSS parsing capabilities.
• Updated nwsapi, improving CSS selector matching.
• Updated parse5, fixing a bug around <noframes> elements and HTML entity decoding.
• Fixed JSDOM.fromURL() to properly reject the returned promise if the server redirects to an invalid URL, instead of causing an uncaught exception.

25.0.1

• Updated dependencies, notably tough-cookie, which no longer prints a deprecation warning.

25.0.0

This major release changes the prototype of a jsdom's EventTarget.prototype to point to the Object.prototype inside the jsdom, instead of pointing to the Node.js Object.prototype. Thus, the prototype chain of Window stays entirely within the jsdom, never crossing over into the Node.js realm.

This only occurs when runScripts is set to non-default values of "dangerously" or "outside-only", as with the default value, there is no separate Object.prototype inside the jsdom.

This will likely not impact many programs, but could cause some changes in instanceof behavior, and so out of an abundance of caution, we're releasing it as a new major version.

24.1.3

• Fixed calls to postMessage() that were done as a bare property (i.e., postMessage() instead of window.postMessage()).

24.1.2

• Fixed an issue with the in operator applied to EventTarget methods, e.g. 'addEventListener' in window, which only appeared in Node.js ≥22.5.0. (legendecas)
• Fixed the events fired by blur(): it no longer fires focus and focusin on the Document, and blur and focusout no longer have their relatedTarget property set. (asamuzaK)

24.1.1

• Fixed selection methods to trigger the selectionchange event on the Document object. (piotr-oles)

24.1.0

... (truncated)

• 1911c80 Version 26.1.0
• ea6e851 Add failing script execution order test
• 2be9dcf Add passing tests for CSS parsing errors
• 9c68fe3 Add failing CSS container queries test
• 501b1cc Add failing CSS cascade layer test
• 1916583 Add passing font-face with a data URL parsing test
• fc2a337 Add passing javascript: URL href test
• 91c610d Move to-upstream CSS tests to correct directory
• a5be813 Add failing calc() serialization test
• 326745d Add passing oklch() serialization test
• Additional commits viewable in compare view

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