Re: [w3c/webcomponents] default focus: Update for the "hint" approach (#852)

alice commented on this pull request.



> @@ -36,13 +37,24 @@ class MyButton extends HTMLElement {
 
 ## Proposal
 
-Add a new property `matchFocusBehaviorOf` to `ElementInternals`, which accepts a string containing a tagname and optionally an attribute with a value (so it will accept values like `div`, `a[href]`, `input[type='checkbox']` , but not `.class`, `*`, etc.). The custom element will then be treated as if it has that tagname and attribute in terms of focus.
+Add `focusBehavior` property to `ElementInternals`, which accepts one of three string values; `"none"`, `"focusable"`, and `"infer"`.
+`"none"` indicates the element is not focusable, and `"focusable"` indicates the element's focus behaivor is same as `<div tabindex=non-negative-value>`. `"infer"` indicates the element is focusable, however a user-agent decides click behaivor and TAB behavior with hints from the element.

So we are excluding programmatically focusable from the list of options? 

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