fix block size for absolute replaced element
Absolutely replaced elements with padding were incorrectly setting their
block size to include twice the padding values. This attempts to stop
that extra padding for replaced elements but leave the working flow for
non replaced elements
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Issue #20593: Implement proper checks in WebGLRenderingContext's getFramebufferAttachmentParameter().
Add missing input checks.
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move test `dom-element-scroll.html` from mozilla to wpt
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The test `dom-element-scroll.html` was originally landed on #19127.
It was designed for testing `scrollLeft` and `scrollTop`.
It is not only for servo. I thought I put a wrong place at that time. It should not be under `mozilla`. It's better placed under `wpt`.
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Sync WPT with upstream (23-05-2018)
⚠️ Do not merge this PR without verifying that it is not overwriting local changes to web-platform-tests. ⚠️
Automated downstream sync of changes from upstream as of 23-05-2018.
[no-wpt-sync]
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