Re: [whatwg/dom] Adoption and DocumentFragment, part two (#819)

@bigopon commented on this pull request.



> + <li>
+  <p>If <var>node</var> is a {{DocumentFragment}} <a for=/>node</a> and its
+  <a for=DocumentFragment>host</a> is non-null, then return <var>node</var>.
+
+  <p class=note>Unfortunately this does not throw for web compatibility.

What does "does not throw for web compatibility" mean? Any one who employs `template.content` node adoption before will now face with breakage with the sudden change of "whose host is non-null, then return".

If we no longer guarantee old API evolves without breaking, how do I find some rule of thumbs what is dangerous and what is not? An example issue is here https://github.com/aurelia/aurelia/issues/1264

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