Version 16.5.0

• Added window.queueMicrotask().
• Added window.event.
• Added inputEvent.inputType. (diegohaz)
• Removed ondragexit from Window and friends, per a spec update.
• Fixed the URL of about:blank iframes. Previously it was getting set to the parent's URL. (SimonMueller)
• Fixed the loading of subresources from the filesystem when they had non-ASCII filenames.
• Fixed the hidden="" attribute to cause display: none per the user-agent stylesheet. (ph-fritsche)
• Fixed the new File() constructor to no longer convert / to :, per a pending spec update.
• Fixed mutation observer callbacks to be called with the MutationObserver instance as their this value.
• Fixed <input type=checkbox> and <input type=radio> to be mutable even when disabled, per a spec update.
• Fixed XMLHttpRequest to not fire a redundant final progress event if a progress event was previously fired with the same loaded value. This would usually occur with small files.
• Fixed XMLHttpRequest to expose the Content-Length header on cross-origin responses.
• Fixed xhr.response to return null for failures that occur during the middle of the download.
• Fixed edge cases around passing callback functions or event handlers. (ExE-Boss)
• Fixed edge cases around the properties of proxy-like objects such as localStorage or dataset. (ExE-Boss)
• Fixed a potential memory leak with custom elements (although we could not figure out how to trigger it). (soncodi)