Content - d6f7bd9e78aedccc86c4a7263b99bb262bae9158 - 03731a9/css/css-rhythm/line-height-step-dynamic-001.html

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Tip revision: 5f32ba4f5129de8d87c9111d09754820d959ae68 authored by Jonathon Kereliuk on 04 April 2018, 18:16:38 UTC
added testdriver automation

Tip revision: 5f32ba4

line-height-step-dynamic-001.html

<!DOCTYPE html>
<title>CSS Rhythmic Sizing: line-height-step dynamic change</title>
<link rel="author" title="Koji Ishii" href="mailto:kojiishi@gmail.com">
<link rel="help" href="https://drafts.csswg.org/css-rhythm-1/#line-height-step">
<meta name="assert" content="This test asserts changing the line-height-step property takes effects.">
<meta name="flags" content="dom">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
div {
  font-size: 20px;
  line-height: 1;
}
</style>
<div id="log"></div>
<div id="target">X</div>
<div id="next">X</div>
<script>
runTests();
function runTests() {
  var before = next.offsetTop;
  target.style.lineHeightStep = "40px";
  var after = next.offsetTop;
  forceRelayout(document.documentElement);
  var afterRelayout = next.offsetTop;

  test(function () {
    assert_not_equals(after, before);
  }, "Height must change when line-height-step changes");
  test(function () {
    assert_equals(after, afterRelayout);
  }, "Height must not change after relayout");
}

function forceRelayout(element) {
  var saved = element.style.display;
  element.style.display = "none";
  element.offsetTop;
  element.style.display = saved;
  element.offsetTop;
}
</script>

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