Add one test for "Update the Rendering" section of HTML. #15510
Merged
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I'm hoping to write a bunch of tests for this section, as part of the
investigation of w3ctag/design-reviews#72, and this is the first one.
It tests that request animation frame callbacks happen in the correct
order across multiple documents.
Gecko, Chromium, and WebKit all fail in different (and nondeterministic)
ways, although I've seen occasional passes.