94 lines
2.7 KiB
HTML
94 lines
2.7 KiB
HTML
<!DOCTYPE html>
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<link rel="help"
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href="https://drafts.csswg.org/css-sizing-4/#stretch-fit-sizing">
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<link rel="help" href="https://github.com/w3c/csswg-drafts/issues/11044">
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<script src='/resources/testharness.js'></script>
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<script src='/resources/testharnessreport.js'></script>
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<script src="/resources/check-layout-th.js"></script>
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<meta name="assert"
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content="margins of the stretched element are accounted for correctly in a variety of scenarios, mostly around siblings">
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<style>
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.outer {
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width: 100px;
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height: 100px;
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outline: solid;
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position: relative;
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}
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.inner {
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height: stretch;
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margin: 10px;
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}
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</style>
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<h2>These tests assert the behavior described at
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https://github.com/w3c/csswg-drafts/issues/11044#issuecomment-2599101601
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</h2>
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<p>Basic case: treat margins as 0.</p>
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<div class="outer">
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<div class="inner" style="border: solid magenta;" data-expected-height="100"
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data-offset-y="0">
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</div>
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</div>
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<p>
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When resolving stretch treat both block margins as 0 because the parent is
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not a BFC and has no top or bottom content edge (i.e. border + padding = 0).
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<br>But cyan's margins will not actually collapse through its IFC-siblings so
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there is overflow:
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</p>
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<div class="outer">
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<div style="overflow: hidden"></div>
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<div class="inner" style="border: solid cyan;" data-expected-height="100"
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data-offset-y="10">
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</div>
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<div style="overflow: hidden"></div>
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</div>
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<div class="outer">
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<div></div>
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<div class="inner" style="border: solid blue;" data-expected-height="100"
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data-offset-y="0">
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</div>
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<div></div>
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</div>
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<div class="outer">
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<div></div>
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<div class="inner" style="border: solid purple;" data-expected-height="100"
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data-offset-y="0">
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</div>
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</div>
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<div class="outer">
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<div class="inner" style="border: solid lime;" data-expected-height="100"
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data-offset-y="0">
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</div>
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<div></div>
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</div>
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<p>Parent has non-zero bottom border, so only top margin is treated as 0:</p>
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<div class="outer" style="border-bottom: 5px dashed blue;">
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<div class="inner" style="border: solid brown;" data-expected-height="90"
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data-offset-y="0">
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</div>
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</div>
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<p>Parent has non-zero top padding so only bottom margin is treated as 0:</p>
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<div class="outer" style="padding-top: 5px;">
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<div class="inner" style="border: solid darkgreen;" data-expected-height="90"
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data-offset-y="15"> <!-- 15 = 10px top margin + parent's padding-->
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</div>
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</div>
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<p>Account for the margins when parent establishes a BFC.</p>
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<div class="outer" style="display: flow-root;">
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<div class="inner" style="border: solid orange;" data-expected-height="80"
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data-offset-y="10">
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</div>
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<div></div>
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</div>
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<script>checkLayout(".inner");</script>
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