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Bug 1480636: Add a WPT test for margin:auto centering behavior of absolutely-positioned tables. r=emilio,TYLin 

The actual bug here was fixed by another commit from another bug. This patch is
just adding a WPT test to ensure we've got test coverage.

(In builds before the fix landed, e.g. Firefox Nightly 2021-01-01, this test
renders with the table placed too high up.  This leaves some red visible and
covers up some of the descriptive text, which properly results in a
test-failure.)

Differential Revision: https://phabricator.services.mozilla.com/D149909
This commit is contained in:
Daniel Holbert 2022-06-21 18:10:18 +00:00
Родитель de373eee8c
Коммит 10e54a0cf4
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testing/web-platform/tests/css/css-tables/absolute-tables-016.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test: Abspos table centered in both axes with auto margins</title>
<link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1480636">
<link rel="help" href="https://www.w3.org/TR/CSS21/visudet.html#abs-non-replaced-width">
<meta name="assert" content="An absolutely-positioned fixed-size table should resolve auto margins the same way that a similarly-sized block would.">
<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
<style>
.container {
/* I've chosen this position/size so that a 100px child element that's
centered within us will be placed at our "normal" position (where our
top-left corner would be, in the absence of relative positioning), so we
can use the simple filled-green-100px-square reference case. */
position: relative;
left: -30px;
top: -30px;
width: 160px;
height: 160px;
}
.target {
display: block;
background: red;
}
.table {
display: table;
background: green;
}
.centered {
position: absolute;
width: 100px;
height: 100px;
inset: 0;
margin: auto; /* use auto margins for centering */
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div class="container">
<!-- We're essentially just comparing the position of the block ("target")
and the table. We expect them to be placed at precisely the same spot,
so no red should be visible. -->
<div class="centered target"></div>
<div class="centered table"></div>
</div>