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chromium/third_party/blink/web_tests/external/wpt/css/css-grid/grid-model/grid-support-display-001.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Grid Layout Test: DOM support for 'grid' and 'inline-grid' 'display' values</title>
<link rel="author" title="Manuel Rego Casasnovas" href="mailto:[email protected]">
<link rel="reviewer" title="Gérard Talbot" href="http://www.gtalbot.org/BrowserBugsSection/css21testsuite/"> <!-- 2014-11-18 -->
<link rel="help" href="http://www.w3.org/TR/css-grid-1/#grid-containers" title="3.1 Establishing Grid Containers">
<meta name="flags" content="dom">
<meta name="assert" content="This test checks that 'grid' and 'inline-grid' values for 'display' property are supported so that DOM methods, specifically getComputedValue(), and its associated CSS2Properties interface, can fetch such 'display' values.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  .grid {
    display: grid;
  }

  .inline-grid {
    display: inline-grid;
  }
</style>
<div id="log"></div>

<div id="style-grid" style="display: grid;"></div>
<div id="style-inline-grid" style="display: inline-grid;"></div>

<div id="css-grid" class="grid"></div>
<div id="css-inline-grid" class="inline-grid"></div>

<div id="js-grid"></div>
<div id="js-inline-grid"></div>

<script>
  function testStyleDisplay(element, value) {
    assert_equals(element.style.display, value, "Style display should be '" + value + "'");
  }

  function testComputedStyleDisplay(element, value) {
    assert_equals(getComputedStyle(element).getPropertyValue("display"), value, "getComputedStyle() display should be '" + value + "'");
  }

  var styleGrid = document.getElementById("style-grid");
  test(function() {
      testStyleDisplay(styleGrid, "grid");
      testComputedStyleDisplay(styleGrid, "grid");
    }, "Test style display 'grid'");

  var styleInlineGrid = document.getElementById("style-inline-grid");
  test(function() {
      testStyleDisplay(styleInlineGrid, "inline-grid");
      testComputedStyleDisplay(styleInlineGrid, "inline-grid");
    }, "Test style display 'inline-grid'");

  var cssGrid = document.getElementById("css-grid");
  test(function() {
      testComputedStyleDisplay(cssGrid, "grid");
    }, "Test CSS display 'grid'");

  var cssInlineGrid = document.getElementById("css-inline-grid");
  test(function() {
      testComputedStyleDisplay(cssInlineGrid, "inline-grid");
    }, "Test CSS display 'inline-grid'");

  var jsGrid = document.getElementById("js-grid");
  jsGrid.style.display = "grid";
  test(function() {
      testStyleDisplay(jsGrid, "grid");
      testComputedStyleDisplay(jsGrid, "grid");
    }, "Test JavaScript display 'grid'");

  var jsInlineGrid = document.getElementById("js-inline-grid");
  jsInlineGrid.style.display = "inline-grid";
  test(function() {
      testStyleDisplay(jsInlineGrid, "inline-grid");
      testComputedStyleDisplay(jsInlineGrid, "inline-grid");
    }, "Test JavaScript display 'inline-grid'");
</script>