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