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chromium/third_party/blink/web_tests/external/wpt/css/css-display/display-with-float-dynamic.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Computed float value of flex/grid items</title>
<link rel="help" href="https://drafts.csswg.org/css-flexbox/#flex-containers">
<link rel="help" href="https://drafts.csswg.org/css-grid-1/#grid-containers">
<meta name="assert" content="computed float value of flex/grid items should be as specified">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div id="flex" style="display:flex;">
  <div id="flex-item"></div>
</div>
<div id="grid" style="display:grid;">
  <div id="grid-item">
</div>
<script>
  function setFloatFor(id, float) {
    document.getElementById(id).style.cssFloat = float;
  }
  function getFloatFor(id) {
    return window.getComputedStyle(document.getElementById(id)).getPropertyValue("float");
  }
  function setDisplayBlock(id) {
    document.getElementById(id).style.display = "block";
  }
  test(function() {
    assert_equals(getFloatFor("flex-item"), "none");
    assert_equals(getFloatFor("grid-item"), "none");

    setFloatFor("flex-item", "left");
    setFloatFor("grid-item", "right");
    assert_equals(getFloatFor("flex-item"), "left");
    assert_equals(getFloatFor("grid-item"), "right");

    setDisplayBlock("grid");
    setDisplayBlock("flex");
    assert_equals(getFloatFor("flex-item"), "left");
    assert_equals(getFloatFor("grid-item"), "right");
  }, "computed style for float");
</script>