• 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)