Part 2 - Fix flex item's stretched cross size with box-sizing:border-…

…box when computing flex container's intrinsic inline size. When the flex item has 'box-sizing:border-box', we should subtract its margin when computing its stretched cross size. The testcase is adapted from aspect-ratio-intrinsic-size-008.html, with "box-sizing:border-box" added to the flex item. Differential Revision: https://phabricator.services.mozilla.com/D231867 bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1936370 gecko-commit: c9a7242c12e360a34bcbcec1824abd9fe8cdc81b gecko-reviewers: dholbert
web-platform-tests · Dec 13, 2024 · 7c9bf45 · 7c9bf45
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diff --git a/css/css-flexbox/aspect-ratio-intrinsic-size-010.html b/css/css-flexbox/aspect-ratio-intrinsic-size-010.html
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+<!DOCTYPE html>
+<link rel="author" title="Ting-Yu Lin" href="mailto:[email protected]">
+<link rel="author" title="Mozilla" href="https://www.mozilla.org/">
+<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#valdef-align-items-stretch">
+<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#intrinsic-sizes">
+<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1936370">
+<link rel="match" href="../reference/ref-filled-green-100px-square-only.html">
+<meta name="assert" content="This checks that a flex item with an aspect-ratio transfers its size when it also has stretch alignment.">
+
+<p>Test passes if there is a filled green square.</p>
+<div style="display: inline-flex; height: 100px; background: green;">
+  <div style="box-sizing: border-box; padding: 3px; border: 7px solid green; margin: 10px;
+              aspect-ratio: 1/1;"></div>
+</div>