gecko-dev/layout/style/test/test_supports_rules.html

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HTML

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=649740
-->
<head>
<title>Test for Bug 649740</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<style id="style">
@supports(color: green){ }
@supports (color: green) { }
@supports ((color: green)) { }
@supports (color: green) and (color: blue) { }
@supports ( Font: 20px serif ! Important) { }
</style>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=649740">Mozilla Bug 649740</a>
<p id="display"></p>
<div id="content" style="display: none">
</div>
<pre id="test">
<script type="application/javascript">
/** Test for Bug 649740 **/
function condition(s) {
return s.replace(/^@supports\s*/, '').replace(/ \s*{\s*}\s*$/, '');
}
var sheet = document.getElementById("style").sheet;
is(condition(sheet.cssRules[0].cssText), "(color: green)");
is(condition(sheet.cssRules[1].cssText), "(color: green)");
is(condition(sheet.cssRules[2].cssText), "((color: green))");
is(condition(sheet.cssRules[3].cssText), "(color: green) and (color: blue)");
is(condition(sheet.cssRules[4].cssText), "( Font: 20px serif ! Important)");
</script>
</pre>
</body>
</html>