Re: [whatwg/dom] Add OpaqueRange interface (PR #1404)

@annevk commented on this pull request.



> @@ -8669,9 +8669,9 @@ be between 0 and the <a>boundary point</a>'s <a for="boundary point">node</a>'s
 <pre class=idl>
 [Exposed=Window]
 interface AbstractRange {
-  readonly attribute Node startContainer;
+  readonly attribute Node? startContainer;
   readonly attribute unsigned long startOffset;

I think that means we need a `valueFromRange()` API or some such on `input` and `textarea`. Since the `input` element or `textarea` element allocated the `OpaqueRange` they will know what it contains and can thus answer such a question (if they want to). That would correctly preserve encapsulation and keep the design generic.

And as this range will have to point to the conceptual `Text` node of the element, the element can naturally only answer the API call for ranges that it created itself.

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