Blitz - WPT: row-wrap-001.html

wpt / css / css-flexbox / intrinsic-size / row-wrap-001.html

Data from commit:
708eb61 WPT runner: support mismatch reftests and multiple rel=match links (#665) (2026-08-09)

Subtest	Status	Message
.floating-flexbox 1	FAIL	assert_equals: data-expected-width expected 100 got 400
.floating-flexbox 2	FAIL	assert_equals: data-expected-width expected 100 got 50
.floating-flexbox 3	FAIL	assert_equals: data-expected-width expected 200 got 150
.floating-flexbox 4	PASS
.floating-flexbox 5	PASS

Enable JavaScript in test iframe

/css/css-flexbox/intrinsic-size/row-wrap-001.html

<!DOCTYPE html>
<link rel="author" title="David Grogan" href="mailto:dgrogan@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#intrinsic-sizes">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<meta name="assert"
  content="min-content width is calculated correctly for row-wrap flex containers in a variety of scenarios with two flex items" />

<style>
  .zero-width {
    width: 0px;
    height: 100px;
    margin-bottom: 20px;
  }

  .floating-flexbox {
    display: flex;
    flex-wrap: wrap;
    outline: 5px solid blue;
    height: 100px;
    float: left;
  }

  .floating-flexbox>div:nth-child(1) {
    background: yellow;
  }

  .floating-flexbox>div:nth-child(2) {
    background: orange;
  }

  .floating-flexbox>div>div {
    width: 100px;
  }

</style>

<body onload="checkLayout('.floating-flexbox')">
  <div class="zero-width">
    <div class="floating-flexbox" data-expected-width="100">
      <!-- contribution: 100 -->
      <div style="flex: 1 1 200px; width:50px;">
        <div></div>
      </div>
      <!-- contribution: 50 -->
      <div style="flex: 1 1 400px; width:50px;">
      </div>
    </div>
  </div>

  <div class="zero-width">
    <div class="floating-flexbox" data-expected-width="100">
      <!-- contribution: 100px
      starts as max(specified=200, min-content=100) = 200
      clamped down to 50 because doesn't grow
      clamped up to 100 because auto min size is 100
      -->
      <div style="flex: 0 0 50px; width: 200px;">
        <div></div>
      </div>
      <!-- contribution: 50px
      starts as max(specified=50, min-content=100) = 100
      clamped down to 50 because doesn't grow
      auto min size is 50, so has no effect
      -->
      <div style="flex: 0 0 50px; width: 50px;">
        <div></div>
      </div>
    </div>
  </div>

  <div class="zero-width">
    <div class="floating-flexbox" data-expected-width="200">
      <!-- contribution: 200px
      starts as max(specified=200, min-content=100) = 200
      auto min size is 100, so has no effect
      -->
      <div style="flex: 1 0 50px; width: 200px;">
        <div></div>
      </div>
      <!-- contribution: 150px
      starts as max(specified=50, min-content=100) = 100
      clamped up to 150 because doesn't shrink
      auto min size is 50, so has no effect
      -->
      <div style="flex: 2 0 150px; width: 50px;">
        <div></div>
      </div>
    </div>
  </div>

  <!-- Same as above case except last item has margins. -->
  <div class="zero-width">
    <div class="floating-flexbox" data-expected-width="450">
      <div style="flex: 1 0 50px; width: 200px;">
        <div></div>
      </div>
      <div style="flex: 2 0 150px; width: 50px; margin-left: 300px;">
        <div></div>
      </div>
    </div>
  </div>

  <!-- Same as above except we now test that gaps are ignored. -->
  <div class="zero-width">
    <div class="floating-flexbox" data-expected-width="450"
      style="row-gap: 24px; column-gap: 17px;">
      <div style="flex: 1 0 50px; width: 200px;">
        <div></div>
      </div>
      <div style="flex: 2 0 150px; width: 50px; margin-left: 300px;">
        <div></div>
      </div>
    </div>
  </div>
</body>