TAMURA, Kent

This is a dupe of https://github.com/w3c/webcomponents/issues/813 and https://github.com/w3c/webcomponents/issues/814.

> It seems like the other tenable position is that readonly="" should give as much readonly behavior as possible, including CSS pseudo-class matching, even if the FACE author still has...

I guess fixing this is not easy due to out-of-process iframe.

I don't have an idea of exact technical issues at this moment. It's just a guess, and I don't think fixing it is impossible.

The situation is similar to `value` attribute/property of ``. It works as: - If `value` attribute is missing, show the default label like "Submit". - If `value` attribute is specified,...

IDL attributes for accessibility attributes apply nullable DOMString. https://w3c.github.io/aria/#idl-interface

> Firefox does this for both xml and xmlns. Thanks! So the change will be: * Add `xml` and `xmlns` special handling to the Element section of https://dom.spec.whatwg.org/#locate-a-namespace * Change...

> @shvaikalesh works on WebKit so I'd say this is ready for a PR and test Got it. Thanks! Google Chrome will collect data about incompatibility of `createNSResolver(non-element).lookupNamespaceURI('xml')`. I'll check...

I think it's ok to change it to ASCII case-insensitive.

Elliot proposed [dispatching DOM mutation events on CEReactions timing](https://lists.w3.org/Archives/Public/www-dom/2016OctDec/0003.html) in 2016. I investigated the feasibility of the proposal. TL;DR: Not feasible for ```DOMNodeRemoved```, feasible for ```DOMNodeRemovedFromDocument``` but it won't have...