Sourced from jsdom's releases.

Version 21.1.0

• Added x, y, pageX, pageY, offsetX, and offsetY to MouseEvent. (jenseng, ViniciusFXavier)
• Added support for unset with getComputedStyle(). (jsnajdr)
• Added the submitter property to SubmitEvent. (jenseng)
• Fixed MouseEvent's screenX and screenY to no longer coerce to integers, allowing fractional values. (jenseng)
• Fixed formEl.submit() to not longer fire submit events. (jenseng)
• Fixed stylesheets to no longer affect the document after their corresponding <link> is removed. (jsnajdr)
• Fixed pointer-events to inherit when used with getComputedStyle(). (jsnajdr)
• Fixed <script> elements with no src="" to no longer fire load events. (t1ger2080)
• Improved getComputedStyle() to cache its results, which should make it much faster. (jsnajdr)

Version 21.0.0

A potentially-breaking bug fix:

• Fixed the window, document, location, and top properties of Window to be non-configurable. (ExE-Boss)

Other changes:

• Added support for <input type=image> submitting forms. (jenseng)
• Added the location setter to the Window object, which forwards to the location.href setter. Setting the URL is still only implemented for fragment navigations, however. (ExE-Boss)
• Fixed defer="" <script> elements that are added after DOMContentLoaded to execute, instead of being skipped.
• Fixed selectElement.selectedOptions being incorrect when optionElement.selected is set. This was a regression introduced in v20.0.1. Unfortunately this also reverts the performance improvement when appending <option> elements that was introduced then. (eps1lon)
• Fixed the self, locationbar, menubar, personalbar, scrollbars, statusbar, toolbar, frames, parent, external, length, and screen properties of Window to be replaceable: that is, setting them will override their values, instead of having the new value be ignored. (ExE-Boss)
• Fixed a few issues with JSOM.fromURL() in the browser build of jsdom. (LungZeno)

Version 20.0.3

• Updated dependencies, notably w3c-xmlserializer, which fixes using DOMParser on XML documents containing emoji.

Version 20.0.2

• Fixed xhr.abort() to no longer give an exception when the constructed XMLHttpRequest was invalid. (whamtet)
• Fixed event.getModifierState() on MouseEvent and KeyboardEvent instances to properly consult the ctrlKey, altKey, metaKey, and shiftKey properties of the event. (juzerzarif)
• Fixed custom element creation to not be affected by any modifications to the window.customElements property. (bicknellr)

Version 20.0.1

• Improved the performance of appending <option> elements to <select> elements. (TheHound)
• Fixed location.pathname getter to not crash when the JSDOM instance was created using an opaque-path URL, including the default URL of about:blank.
• Fixed crypto.getRandomValues() to accept typed array subclasses. (sebamarynissen)
• Updated various dependency minor versions. Notably, nwsapi fixed some selectors bugs, and tough-cookie fixed some cookie bugs.

Version 20.0.0

• Node.js v14 is now the minimum supported version.
• Added crypto.getRandomValues(). (sjrd)
• Added HTMLFormControlsCollection and RadioNodeList, so formEl.elements now behaves correctly. (UndefinedBehavior)
• Added the signal option to addEventListener(). (cheap-glitch)
• Fixed the :root pseudoclass to work correctly. (hughs-ch)
• Updated parse5, bringing along some HTML parsing and serialization fixes. (fb55)

Version 19.0.0

• Changed jsdom.nodeLocation() to return undefined when used on nodes that originate via fragment parsing (e.g., via innerHTML). Previously it would return based on the node location of the fragment string, which made node locations unreliable with respect to the original document source. This restores the behavior that was present in v14.0.0, and was accidentally broken in v14.1.0. (bakkot)
• Fixed calling window.close() inside the Window's load event to no longer crash. (MattiasBuelens)

Sourced from jsdom's changelog.

21.1.0

• Added x, y, pageX, pageY, offsetX, and offsetY to MouseEvent. (jenseng, ViniciusFXavier)
• Added support for unset with getComputedStyle(). (jsnajdr)
• Added the submitter property to SubmitEvent. (jenseng)
• Fixed MouseEvent's screenX and screenY to no longer coerce to integers, allowing fractional values. (jenseng)
• Fixed formEl.submit() to not longer fire submit events. (jenseng)
• Fixed stylesheets to no longer affect the document after their corresponding <link> is removed. (jsnajdr)
• Fixed pointer-events to inherit when used with getComputedStyle(). (jnajdr)
• Fixed <script> elements with no src="" to no longer fire load events. (t1ger2080)
• Improved getComputedStyle() to cache its results, which should make it much faster. (jsnajdr)

21.0.0

A potentially-breaking bug fix:

• Fixed the window, document, location, and top properties of Window to be non-configurable. (ExE-Boss)

Other changes:

• Added support for <input type=image> submitting forms. (jenseng)
• Added the location setter to the Window object, which forwards to the location.href setter. Setting the URL is still only implemented for fragment navigations, however. (ExE-Boss)
• Fixed defer="" <script> elements that are added after DOMContentLoaded to execute, instead of being skipped.
• Fixed selectElement.selectedOptions being incorrect when optionElement.selected is set. This was a regression introduced in v20.0.1. Unfortunately this also reverts the performance improvement when appending <option> elements that was introduced then. (eps1lon)
• Fixed the self, locationbar, menubar, personalbar, scrollbars, statusbar, toolbar, frames, parent, external, length, and screen properties of Window to be replaceable: that is, setting them will override their values, instead of having the new value be ignored. (ExE-Boss)
• Fixed a few issues with JSOM.fromURL() in the browser build of jsdom. (LungZeno)

20.0.3

• Updated dependencies, notably w3c-xmlserializer, which fixes using DOMParser on XML documents containing emoji.

20.0.2

• Fixed xhr.abort() to no longer give an exception when the constructed XMLHttpRequest was invalid. (whamtet)
• Fixed event.getModifierState() on MouseEvent and KeyboardEvent instances to properly consult the ctrlKey, altKey, metaKey, and shiftKey properties of the event. (juzerzarif)
• Fixed custom element creation to not be affected by any modifications to the window.customElements property. (bicknellr)

20.0.1

• Improved the performance of appending <option> elements to <select> elements. (TheHound)
• Fixed location.pathname getter to not crash when the JSDOM instance was created using an opaque-path URL, including the default URL of about:blank.
• Fixed crypto.getRandomValues() to accept typed array subclasses. (sebamarynissen)
• Updated various dependency minor versions. Notably, nwsapi fixed some selectors bugs, and tough-cookie fixed some cookie bugs.

20.0.0

• Node.js v14 is now the minimum supported version.
• Added crypto.getRandomValues(). (sjrd)
• Added HTMLFormControlsCollection and RadioNodeList, so formEl.elements now behaves correctly. (UndefinedBehavior)
• Added the signal option to addEventListener(). (cheap-glitch)

... (truncated)

• 8e3a568 Version 21.1.0
• 026ceb5 Do not fire "load" on <script> without src=""
• a5204df Add inheritance for pointer-events to getComputedStyle()
• 709f33a Cache element styles for getComputedStyle()
• 980c6f6 Remove stylesheet from document when <link> is removed
• ecce8bc Don't fire submit event from form.submit()
• 79c351b Add SubmitEvent's submitter
• 8a43fd5 Add support for unset CSS keyword to getComputedStyle()
• eb82a27 Add CSSOM View extensions to MouseEvent
• a7c8545 Version 21.0.0
• Additional commits viewable in compare view

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