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chromium/third_party/blink/web_tests/external/wpt/css/css-align/blocks/align-content-block-001-ref.html 

<!DOCTYPE html>
<title>CSS Box Alignment: non-normal align-content establishes block formatting context root on blocks</title>
<link rel="author" title="Elika J. Etemad" href="http://fantasai.inkedblade.net/contact">

<style>
  html, body { margin: 0; font-size: 10px; line-height: 1; color: transparent; }
  /* show bounds of test box without interfering with margin-collapsing */
    .test { background: black; padding-right: 2px; margin: 0.5em; }
  /* ensure float cannot penetrate */
    .outer-float { float: left; height: 600px; /* reftest limit = 600px */
                   margin: 0 1em; background: gray; }
  /* ensure float is contained */
    .float { float: left; background: orange; height: 2em }
  /* ensure margin is contained */
    .in-flow { margin-top: 1em; background: orange }

  /* reference code */
    .test { overflow: hidden; display: flow-root; }
</style>

<div class="outer-float">FLT</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>
<div class="test" style="overflow: visible; display: block">
  <div class="in-flow"><div class="float">FLT</div>BLOCK</div>
</div>