Changes since 26.1.0

• Node.js v20 is now the minimum supported version.
• Added a variety of event constructors, even though we do not implement their associated specifications or ever fire them: BeforeUnloadEvent, BlobEvent, DeviceMotionEvent (omitting requestPermission()), DeviceOrientationEvent (omitting requestPermission()), PointerEvent, PromiseRejectionEvent, and TransitionEvent.
• Added movementX and movementY to MouseEvent. (These are from the Pointer Lock specification, the rest of which is not implemented.)
• Added customElements.getName(). (mash-graz)
• Updated the virtual console:
  • "jsdomError" events are now documented, with specific type properties and other properties that depend on the type.
  • sendTo() was renamed to forwardTo().
  • The jsdomErrors option to forwardTo() can be used to control which errors are sent to the Node.js console. This replaces the previous omitJSDOMErrors boolean option.
  • "jsdomError"s for failed XMLHttpRequest fetches are no longer emitted.
  • The values that are printed when forwarding "jsdomError"s to the Node.js console are streamlined.
• Switched our CSS selector engine from nwsapi to @asamuzakjp/dom-selector, closing over 20 selector-related bugs.
• Upgraded tough-cookie, which now considers URLs like http://localhost/ to be secure contexts (per the spec), and thus will return Secure-flagged cookies for such URLs. (colincasey)
• Upgraded cssstyle, which brings along many improvements and fixes to the CSSStyleDeclaration object and its properties.
• Updated the user agent stylesheet to be derived from the HTML Standard, instead of from an old revision of Chromium.
• Changed element.click() to fire a PointerEvent instead of a MouseEvent.
• Changed certain events to be passive by default.
• Changed the <input> element's pattern="" attribute to use the v regular expression flag, instead of u.
• Fixed many specification conformance issues with the Window object, including named properties and changing various data properties to accessor properties.
• Fixed document.createEvent() to accept a more correct set of event names.
• Fixed the ElementInternals accessibility getters and setters. (They were introduced in v23.1.0, but due to inadequate test coverage never actually worked.)
• Fixed using Object.defineProperty() on certain objects, such as HTMLSelectElement instances.
• Fixed jsdom.reconfigure({ url }) not updating document.baseURI or properties derived from it. (This regressed in v26.1.0.)
• Fixed CSS system colors, as well as the initial, inherit, and unset keywords, to resolve correctly. (asamuzaK)
• Fixed CSS display style resolution. (asamuzaK)

Changes since 27.0.0-beta.3

• Upgraded cssstyle, which brings along various CSS parsing fixes.