File: wm-propagation-body-computed-root.html

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<!DOCTYPE html>
<meta charset="UTF-8">
<title>CSS Writing Modes Test: Computed writing-mode for html element when writing mode for body propagated to viewport</title>
<link rel="author" title="Rune Lillesveen" href="mailto:rune@opera.com">
<link rel="help" href="https://www.w3.org/TR/css-writing-modes-3/#principal-flow">
<meta name="assert" content="Test that propagating writing-mode from body to viewport does not affect the computed writing-mode of the html element">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  .vertical-lr { writing-mode: vertical-lr }
</style>
<body class="vertical-lr">
<script>
  test(function() {
    assert_equals(getComputedStyle(document.body).writingMode, "vertical-lr");
  }, "Check computed writing-mode for body element.");

  test(function() {
    assert_not_equals(getComputedStyle(document.documentElement).writingMode, "vertical-lr");
  }, "Check computed writing-mode for html root element.");

  test(function() {
    document.body.className = "";
    assert_not_equals(getComputedStyle(document.body).writingMode, "vertical-lr");
  }, "Check computed writing-mode for body element when style no longer applies.");
</script>