wpt / css / css-flexbox / percentage-heights-001.html

Status: FAIL | Duration: 3ms | Subtests: 8/13 | Open test on wpt.live | wpt.fyi

TestTest SourceSubtests (8/13)

Data from commit:
1efe22d Fix duplicate table cell padding with float layout (#675) (2026-08-10)

SubtestStatusMessage
.flexbox 1FAILassert_equals: data-expected-height expected 50 got 0 assert_equals: data-expected-height expected 50 got 0 assert_equals: data-expected-height expected 25 got 0
.flexbox 2FAILassert_equals: data-expected-height expected 50 got 0 assert_equals: data-expected-height expected 50 got 0 assert_equals: data-expected-height expected 25 got 0
.flexbox 3FAILassert_equals: data-expected-height expected 50 got 0 assert_equals: data-expected-height expected 50 got 0
.flexbox 4PASS
.flexbox 5PASS
.flexbox 6PASS
.flexbox 7PASS
.flexbox 8PASS
.flexbox 9PASS
.flexbox 10FAILassert_equals: data-expected-height expected 50 got 0 assert_equals: data-expected-height expected 50 got 0 assert_equals: data-expected-height expected 25 got 0
.flexbox 11PASS
.flexbox 12FAILassert_equals: data-expected-height expected 50 got 0 assert_equals: data-expected-height expected 50 got 0 assert_equals: data-expected-height expected 25 got 0
.flexbox 13PASS

/css/css-flexbox/percentage-heights-001.html

<!DOCTYPE html>

<title>CSS Flexbox: Definite cross sizes</title>

<link rel="stylesheet" href="support/flexbox.css">
<link rel="help" href="https://drafts.csswg.org/css-flexbox-1/#definite-sizes">
<link rel="author" title="Google Inc." href="https://www.google.com/">
<meta name="flags" content="dom" />

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>

<style>
.rect {
  width: 50px;
  height: 50px;
  background-color: blue;
}

.flexbox {
  width: 50px;
  outline: 3px solid black;
}


.flexbox > * {
  min-height: 0;
  min-width: 0;
}

.flexbox > div > div {
  overflow: hidden;
}
</style>

<body onload="checkLayout('.flexbox')" style="height: 800px;">
<div id=log></div>


<p>This test verifies that we consider flex items' cross sizes to be definite
if the align value is stretch (the default)</p>

<p>Tests that we get a definite size in the simple case:</p>
<div class="flexbox" data-expected-height="50">
  <div data-expected-height="50">
    <div style="height: 50%" data-expected-height="25">
      <div class="rect" data-expected-height="50"></div>
    </div>
  </div>
</div>

<p>Tests that we get a definite size in a wrapping flexbox:</p>
<div class="flexbox wrap" data-expected-height="50">
  <div data-expected-height="50">
    <div style="height: 50%" data-expected-height="25">
      <div class="rect" data-expected-height="50"></div>
    </div>
  </div>
</div>

<p>Tests that we get an indefinite size when not stretch-aligning, despite
definite size on container:</p>
<div class="flexbox wrap" style="height: 50px;" data-expected-height="50">
  <div class="align-self-flex-start" data-expected-height="50">
    <div style="height: 50%" data-expected-height="50">
      <div class="rect" data-expected-height="50"></div>
    </div>
  </div>
</div>

<p>Tests that we get a definite size in a definite-height flexbox:</p>
<div class="flexbox" style="height: 50px;" data-expected-height="50">
  <div data-expected-height="50">
    <div style="height: 50%" data-expected-height="25">
      <div class="rect" data-expected-height="50"></div>
    </div>
  </div>
</div>

<p>Tests that we get a definite size in a nested flexbox where only the outer
one has an explicit height:</p>
<div class="flexbox" style="height: 50px;" data-expected-height="50">
  <div class="flexbox" data-expected-height="50">
    <div data-expected-height="50">
      <div style="height: 50%" data-expected-height="25">
        <div class="rect" data-expected-height="50"></div>
      </div>
    </div>
  </div>
</div>

<p>Tests that we get a definite size in a nested flexbox where only the outer
one has an explicit height and has an opposite direction:</p>
<div class="flexbox" style="height: 50px;" data-expected-height="50">
  <div class="flexbox column" data-expected-height="50">
    <div class="flex-one" data-expected-height="50">
      <div style="height: 50%" data-expected-height="25">
        <div class="rect" data-expected-height="50"></div>
      </div>
    </div>
  </div>
</div>

<p>Tests that we respect min-height, on child of a flex item with percent
height that's treated as definite:</p>
<div class="flexbox" style="height: 50px;" data-expected-height="50">
  <div data-expected-height="50">
    <div style="height: 50%; min-height: 30px;" data-expected-height="30">
      <div class="rect" data-expected-height="50"></div>
    </div>
  </div>
</div>

<p>Tests that max-height also supports percentages:</p>
<div class="flexbox" data-expected-height="50">
  <div data-expected-height="50">
    <div style="max-height: 50%" data-expected-height="25">
      <div class="rect" data-expected-height="50"></div>
    </div>
  </div>
</div>

<p>Tests that percentage sizes can also be definite:</p>
<div class="flexbox" style="height: 10%;" data-expected-height="80">
  <div data-expected-height="80">
    <div style="height: 50%" data-expected-height="40">
      <div class="rect" data-expected-height="50"></div>
    </div>
  </div>
</div>

<p>Tests that we use a definite size even when a percentage size is not definite</p>
<div>
  <div class="flexbox" style="height: 10%;" data-expected-height="50">
    <div data-expected-height="50">
      <div style="height: 50%" data-expected-height="25">
        <div class="rect" data-expected-height="50"></div>
      </div>
    </div>
  </div>
</div>

<p>Tests that we don't mix up widths and heights</p>
<div class="flexbox" style="height: 50px; width: 100px;" data-expected-height="50">
  <div style="width: 100px;" data-expected-height="50" data-expected-width="100">
    <div style="width: 50%" data-expected-width="50">
      <div class="rect" data-expected-height="50" data-expected-width="50"></div>
    </div>
  </div>
</div>