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layout: Ensure that <caption>'s support position: relative (#33426)

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This change adds support for `position: relative` to table `<caption>`.
In addition to adjusting their position according to inset values, table
captions must also establish containing blocks for descendants that are
absolutely positioned.

Signed-off-by: Martin Robinson <mrobinson@igalia.com>
Co-authored-by: Oriol Brufau <obrufau@igalia.com>
This commit is contained in:
Martin Robinson 2024-09-19 14:43:29 +02:00 • committed by GitHub
parent eecf5bdea1
commit ef229b9386
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5 changed files with 52 additions and 7 deletions
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13
tests/wpt/meta/MANIFEST.json vendored
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@ -240575,6 +240575,19 @@
{}
]
],
"caption-relative-positioning.html": [
"2be1e86bc077f1293ccc9ea851f23123ae679157",
[
null,
[
[
"/css/reference/ref-filled-green-100px-square.xht",
"=="
]
],
{}
]
],
"col-definite-max-size-001.html": [
"bcd7ca2fd89c26384e26be64dade0e7af0ea4c79",
[

2
tests/wpt/meta/css/CSS2/abspos/table-caption-is-containing-block-001.html.ini vendored
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@ -1,2 +0,0 @@
[table-caption-is-containing-block-001.html]
expected: FAIL

2
tests/wpt/meta/css/css-position/position-relative-table-caption.html.ini vendored
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@ -1,2 +0,0 @@
[position-relative-table-caption.html]
expected: FAIL

26
tests/wpt/tests/css/css-tables/caption-relative-positioning.html vendored Normal file
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@ -0,0 +1,26 @@
<!DOCTYPE html>
<html>
<link rel="author" title="Martin Robinson" href="mailto:mrobinson@igalia.com">
<link rel="author" title="Oriol Brufau" href="mailto:obrufau@igalia.com">
<title>&lt;caption&gt; elements can be relatively positioned</title>
<meta name="assert" content="The caption is positioned relatively to the table wrapper">
<link rel="help" href="https://drafts.csswg.org/css2/#relative-positioning">
<link rel="match" href="/css/reference/ref-filled-green-100px-square.xht">
<style>
caption {
position: relative;
background: green;
width: 100px;
height: 100px;
margin-left: 200px;
left: -200px;
}
</style>
<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
<div style="width: 100px; background: red;">
<table>
<caption></caption>
</table>
</div>
</html>