test_root_node_display.html

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<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=969460

-->

<head>

  <meta charset="utf-8">

  <title>Test for Bug 969460</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script type="text/javascript" src="property_database.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=969460">Mozilla Bug 969460</a>

<p id="display"></p>

<div id="content" style="display: none">

  <div id="float" style="float: left"></div>

</div>

<pre id="test">

<script type="application/javascript">

/** Test for Bug 969460: Test that "display" on the root node is computed

    using the same conversion that we use for display on floated elements **/

function test_display_value(val)

  var floatElem = document.getElementById("float");

  floatElem.style.display = val;

  var floatConversion = window.getComputedStyle(floatElem).display;

  floatElem.style.display = "";

  var rootNode = document.documentElement;

  rootNode.style.display = val;

  rootNode.offsetHeight; // (Flush layout, to be sure layout can handle 'val')

  var rootConversion = window.getComputedStyle(rootNode).display;

  rootNode.style.display = "";

  // Special case: "display:list-item" does not get modified by 'float',

  // but the spec allows us to convert it to 'block' on the root node

  // (and we do convert it, so that we don't have to support documents whose

  // root node is a list-item).

  if (val == "list-item") {

    is(floatConversion, val, "'float' shouldn't affect 'display:list-item'");

    is(rootConversion, "block",

       "We traditionally convert '" + val + "' on the root node to " +

       "'display:block' (though if that changes, it's not technically a bug, " +

       "as long as we support it properly).");

} else if (val == "inline list-item" ||

           val == "inline flow-root list-item") {

    is(floatConversion, "list-item", "'float' should blockify '" + val + "'");

    is(rootConversion, "block",

       "We traditionally convert '" + val + "' on the root node to " +

       "'display:block' (though if that changes, it's not technically a bug, " +

       "as long as we support it properly).");

  } else if (val == "contents") {

    is(floatConversion, val, "'float' shouldn't affect 'display:contents'");

    is(rootConversion, "block",

       "'display:contents' on the root node computes to block-level per" +

       "http://dev.w3.org/csswg/css-display/#transformations");

  } else {

    is(rootConversion, floatConversion,

       "root node should make 'display:" + val + "' compute to the same " +

       "value that it computes to on a floated element");

var displayInfo = gCSSProperties.display;

displayInfo.initial_values.forEach(test_display_value);

displayInfo.other_values.forEach(test_display_value);

</script>

</pre>

</body>

</html>