Capture Window Client cannot use attributes/methods directly

[annevk]

You need to use the internal algorithms these attributes/methods are proxies for. Otherwise JavaScript manipulating them would influence your specification.

[jungkees]

You mean it can be influenced by Function.prototype.call(this, ...) or something like that?

Could you let me know what would be a good practice for example? Like for the hadFocus() method referred to in this algorithm, is it a right way to specify the same steps defined in HTML as-is? Or any better way?

[annevk]

You should probably ask @Hixie if he can make that algorithm abstract so you can refer to it. There's also some way to capture the algorithm the moment the global is created before any scripts are executed, but that's rather cumbersome.

[jungkees]

Filed: https://www.w3.org/Bugs/Public/show_bug.cgi?id=28090
/cc @Hixie

[jungkees]

I'll make a PR for this in HTML.

[jungkees]

Made a PR: whatwg/html#308.