• Added crypto.randomUUID(). (jamesbvaughan)
• Added DOMRect and DOMRectReadOnly.
• Added AbortSignal.timeout().
• Added abortSignal.throwIfAborted().
• Added support for the submitter argument to the FormData constructor. (jenseng)
• Improved getComputedStyle()'s results for color-based properties, to resolve named colors and attempt to provide initial inheritance support. (hoekz-wwt)
• Updated Window's event handler properties (e.g. oncopy, ontouchstart, etc.) to reflect the latest list from the standard.
• Fixed DOMParser-created documents to inherit their URL from the creating document.