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Test Info: Warnings
- This test has a WPT meta file that expects 3 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /css/css-sizing/stretch/block-height-004.tentative.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<link rel="help"
<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>
<script src="/resources/check-layout-th.js"></script>
<meta name="assert"
content="demonstrate the behavior described in https://github.com/w3c/csswg-drafts/issues/11044#issuecomment-2422165458">
<style>
.outer {
width: 100px;
height: 100px;
outline: solid;
position: relative;
}
.inner {
height: stretch;
margin: 10px;
}
p {
margin-top: 20px;
margin-bottom: 0px;
}
</style>
<p>This test asserts the behavior seemingly agreed upon through
is unlikely to be the final specified behavior, hence the test is marked
tentative.</p>
<p>Basic case: treat margins as 0.</p>
<div class="outer">
<div class="inner" style="border: solid magenta;" data-expected-height="100"
data-offset-y="0">
</div>
</div>
<p>
When resolving stretch, don't treat margins as 0 if there is a sibling on that
side. (Hand-wavy: we don't collapse margins through siblings for the purpose
of resolving stretched heights.)</p>
<p>
Then when actually doing margin collapsing, .inner's margins DON'T collapse
with .outer's because of the usual rule that margins don't collapse through
new formatting contexts.
</p>
<div class="outer">
<div style="overflow: hidden"></div>
<div class="inner" style="border: solid cyan;" data-expected-height="80"
data-offset-y="10">
</div>
<div style="overflow: hidden"></div>
</div>
<p>When resolving stretch, don't treat margins as 0 if there is a sibling on
that side. (Hand-wavy: we don't collapse margins through siblings for the
purpose of resolving stretched heights.)</p>
<p>
Then when actually doing margin collapsing, .inner's margins DO collapse with
.outer's because they collapse through the empty siblings.
</p>
<div class="outer">
<div></div>
<div class="inner" style="border: solid blue;" data-expected-height="80"
data-offset-y="0">
</div>
<div></div>
</div>
<p>Only treat the BOTTOM margin as 0. Margins do collapse, so top edges touch.
</p>
<div class="outer">
<div></div>
<div class="inner" style="border: solid purple;" data-expected-height="90"
data-offset-y="0">
</div>
</div>
<p>Only treat the TOP margin as 0. Margins do collapse, so top edges touch.</p>
<div class="outer">
<div class="inner" style="border: solid lime;" data-expected-height="90"
data-offset-y="0">
</div>
<div></div>
</div>
<p>Account for the margins when parent establishes a BFC.</p>
<div class="outer" style="display: flow-root;">
<div class="inner" style="border: solid orange;" data-expected-height="80"
data-offset-y="10">
</div>
<div></div>
</div>
<script>checkLayout(".inner");</script>