(Path is actually r=froydnj.)
Bug 1400459 devirtualized nsIAtom so that it is no longer a subclass of
nsISupports. This means that nsAtom is now a better name for it than nsIAtom.
MozReview-Commit-ID: 91U22X2NydP
The spec recently changed to match browsers better. There's currently
not much interop in exact details of how this work. This brings us in
line with the spec except for the limit of 1000 on the span attribute.
The added textarea failures are spurious, because I'm not updating our
local tests in this commit. The new tests are submitted upstream at
<https://github.com/w3c/web-platform-tests/pull/3518>.
MozReview-Commit-ID: 1L8aUtF47Qi