Re: [whatwg/dom] Un-merge Document and HTMLDocument (#221)

Missing *not* in the last sentence?

In Blink most of what was in HTMLDocument has already been moved to Document, see https://github.com/whatwg/dom/issues/221#issuecomment-209989740.

The set of things that are in HTMLDocument in [Gecko](https://github.com/mozilla/gecko-dev/blob/master/dom/webidl/HTMLDocument.webidl) and [WebKit](https://trac.webkit.org/browser/trunk/Source/WebCore/html/HTMLDocument.idl) is not aligned.

In Edge, where the IDL files aren't available, I see that `Object.getOwnPropertyNames(HTMLDocument.prototype)` and `Object.getOwnPropertyNames(XMLDocument.prototype)` both return just `["constructor"]` while `Object.getOwnPropertyNames(Document.prototype)` returns `["constructor", "URL", "URLUnencoded", "activeElement", "alinkColor", "all", "anchors", "applets", "bgColor", "body", "characterSet", "charset", "compatMode", "cookie", "currentScript", "defaultCharset", "defaultView", "designMode", "dir", "doctype", "documentElement", "domain", "embeds", "fgColor", "forms", "head", "hidden", "images", "implementation", "inputEncoding", "lastModified", "linkColor", "links", "location", "msCSSOMElementFloatMetrics", "msCapsLockWarningOff", "onabort", "onactivate", "onbeforeactivate", "onbeforedeactivate", "onblur", "oncanplay", "oncanplaythrough", "onchange", "onclick", "oncontextmenu", "ondblclick", "ondeactivate", "ondrag", "ondragend", "ondragenter", "ondragleave", "ondragover", "ondragstart", "ondrop", "ondurationchange", "onemptied", "onended", "onerror", "onfocus", "oninput", "oninvalid", "onkeydown", "onkeypress", "onkeyup", "onload", "onloadeddata", "onloadedmetadata", "onloadstart", "onmousedown", "onmousemove", "onmouseout", "onmouseover", "onmouseup", "onmousewheel", "onmscontentzoom", "onmsgesturechange", "onmsgesturedoubletap", "onmsgestureend", "onmsgesturehold", "onmsgesturestart", "onmsgesturetap", "onmsinertiastart", "onmsmanipulationstatechanged", "onmssitemodejumplistitemremoved", "onmsthumbnailclick", "onpause", "onplay", "onplaying", "onpointerlockchange", "onpointerlockerror", "onprogress", "onratechange", "onreadystatechange", "onreset", "onscroll", "onseeked", "onseeking", "onselect", "onselectionchange", "onselectstart", "onstalled", "onstop", "onsubmit", "onsuspend", "ontimeupdate", "onvolumechange", "onwaiting", "onwebkitfullscreenchange", "onwebkitfullscreenerror", "plugins", "pointerLockElement", "readyState", "referrer", "rootElement", "scripts", "scrollingElement", "styleSheets", "title", "visibilityState", "vlinkColor", "webkitCurrentFullScreenElement", "webkitFullscreenElement", "webkitFullscreenEnabled", "webkitIsFullScreen", "xmlEncoding", "xmlStandalone", "xmlVersion", "onpointercancel", "onpointerdown", "onpointerenter", "onpointerleave", "onpointermove", "onpointerout", "onpointerover", "onpointerup", "onwheel", "adoptNode", "captureEvents", "caretRangeFromPoint", "clear", "close", "createAttribute", "createAttributeNS", "createCDATASection", "createComment", "createDocumentFragment", "createElement", "createElementNS", "createExpression", "createNSResolver", "createNodeIterator", "createProcessingInstruction", "createRange", "createTextNode", "createTreeWalker", "elementFromPoint", "evaluate", "execCommand", "execCommandShowHelp", "exitPointerLock", "focus", "getElementById", "getElementsByClassName", "getElementsByName", "getElementsByTagName", "getElementsByTagNameNS", "getSelection", "hasFocus", "importNode", "msElementsFromPoint", "msElementsFromRect", "open", "queryCommandEnabled", "queryCommandIndeterm", "queryCommandState", "queryCommandSupported", "queryCommandText", "queryCommandValue", "releaseEvents", "updateSettings", "webkitCancelFullScreen", "webkitExitFullscreen", "write", "writeln", "createEvent", "querySelector", "querySelectorAll"]`.

In other words, it looks like Edge has already moved everything to Document.

@cdumez, what do you think would be a reasonable thing to attempt to converge on? Based on the above, I think the most tractable path with relatively low risk is to move everything into Document, but then leave HTMLDocument an empty interface just like XMLDocument.

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