forked from mirrors/gecko-dev
c1ac1fc784
Before this patch, a block frame considers a line dirty only if the line's block-end is larger than content area's block-end. However, scrollable overflow area should be broken in paginated environment (both in a column container and in printing). We should take this into account when marking a line dirty. The dynamic wpt reftests are written with the following conditions in mind to expose the bug: 1. Initially, all the elements fit into the first column. 2. After shrinking the multicol height, the block itself still fits into the first column, but its tall child (either a simple tall block or a tall float), which overflows the smaller multicol height, needs to be broken. The flexbox printing reftest are similar. A flex container uses unconstrained available block-size to measure flex items' block-size, and then performs a final reflow with constrained available block-size, which is similar to the dynamic scenario above. One caveat is that flex items usually have IsBResize() set. So to expose this bug, a float element needs to be deeply nested under a flex item. Differential Revision: https://phabricator.services.mozilla.com/D85479
48 lines
1.4 KiB
HTML
48 lines
1.4 KiB
HTML
<!DOCTYPE html>
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<!-- Any copyright is dedicated to the Public Domain.
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http://creativecommons.org/publicdomain/zero/1.0/ -->
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<html>
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<meta charset="utf-8">
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<title>Test for dynamic re-pagination of a nested float element</title>
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<link rel="author" title="Ting-Yu Lin" href="mailto:tlin@mozilla.com">
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<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
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<link rel="help" href="https://drafts.csswg.org/css-break/#possible-breaks">
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<link rel="help" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1559961">
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<link rel="match" href="../reference/ref-filled-green-100px-square.xht">
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<style>
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#multicol {
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columns: 2;
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column-fill: auto;
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column-gap: 0;
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height: 400px; /* Must be large enough so that .target doesn't break initially. */
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width: 100px;
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background: red;
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}
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.block {
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width: 50px;
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background: green;
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}
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.target {
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float: left;
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height: 160px; /* Expected to be broken into 2 columns after runTest() */
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}
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</style>
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<script>
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function runTest() {
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document.body.offsetHeight;
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document.getElementById("multicol").style.height = "100px";
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}
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</script>
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<body onload="runTest()">
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<p>Test passes if there is a filled green square and <strong>no red</strong>.</p>
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<div id="multicol">
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<div>
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<div class="block" style="height: 40px"></div>
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<div class="block target"></div>
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</div>
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</div>
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</body>
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</html>
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