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chromium/third_party/blink/web_tests/external/wpt/css/css-writing-modes/writing-mode-parsing-001.html 

<!DOCTYPE html>
<title>CSS Writing Modes: parsing writing-mode</title>
<link rel="author" title="Koji Ishii" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/css-writing-modes-3/#block-flow">
<meta name="assert" content="This test asserts the parser and getComputedStyle works correctly for the writing-mode property.">
<meta name="flags" content="dom">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<div
  data-expected="horizontal-tb" title="writing-mode initial value"></div>

<div style="writing-mode: vertical-rl"
  data-expected="vertical-rl"></div>
<div style="writing-mode: vertical-lr"
  data-expected="vertical-lr"></div>

<div style="writing-mode: vertical-rl">
  <div
    data-expected="vertical-rl" title="writing-mode should inherit"></div>

  <div style="writing-mode: horizontal-tb"
    data-expected="horizontal-tb"></div>

  <div style="writing-mode: initial"
    data-expected="horizontal-tb"></div>
  <div style="writing-mode: inherit"
    data-expected="vertical-rl"></div>
  <div style="writing-mode: horizontal-tb; writing-mode: inherit"
    data-expected="vertical-rl"></div>

  <div style="writing-mode: foo"
    data-expected="vertical-rl"></div>
</div>

<script>
Array.prototype.forEach.call(document.querySelectorAll("[data-expected]"), function (element) {
  test(function () {
    var actual = getComputedStyle(element).writingMode;
    assert_equals(actual, element.dataset.expected);
  }, element.title || element.getAttribute("style"));
});
</script>