commit | 2325c3116df939810a02dfaddf55a5fae6926690 | [log] [tgz] |
---|---|---|
author | Daniel Holbert <dholbert@cs.stanford.edu> | Mon Jan 09 20:31:00 2023 |
committer | moz-wptsync-bot <wptsync@mozilla.com> | Tue Jan 10 18:13:11 2023 |
tree | 3b2a72f30c8938dd8eb3b492046b55b131127b30 | |
parent | 388f96cedbd09bac43844c1bb18e13b8075fe00d [diff] |
Use an even font-size in WPT position-sticky-writing-modes.html, so that it's not laying out text with a fractional central baseline. Before this patch, this test was using Ahem text with a 25px font-size and a vertical writing mode. The vertical writing-mode causes the text to be baseline-aligned using a *central* baseline, which ends up being at a half-pixel position, since our font-size is odd. Specifically: the central baseline is 25px/2 = 12.5px inwards from the edge of the glyph. The UA may choose to round this fractional central baseline to a whole pixel value when sizing/placing content, which in turn casues this test to fail with content being 1px away from where the test expects it to be. This patch addresses this issue by making the test use an even number as the font-size (30px), which produces a nice whole-number pixel value for the central basleine. This avoids creating a depending on the UA's choice of rounding behavior. This makes the test pass in Firefox, and I believe it continues to pass in other browsers where it was already passing. Differential Revision: https://phabricator.services.mozilla.com/D166232 bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1808997 gecko-commit: 940a9c3334334ed6461fda3ce57db47c693ec674 gecko-reviewers: jfkthame
The web-platform-tests Project is a cross-browser test suite for the Web-platform stack. Writing tests in a way that allows them to be run in all browsers gives browser projects confidence that they are shipping software that is compatible with other implementations, and that later implementations will be compatible with their implementations. This in turn gives Web authors/developers confidence that they can actually rely on the Web platform to deliver on the promise of working across browsers and devices without needing extra layers of abstraction to paper over the gaps left by specification editors and implementors.
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Clone or otherwise get https://github.com/web-platform-tests/wpt.
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See the documentation website and in particular the system setup for running tests locally.
The wpt
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