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<!DOCTYPE html>
<html>
<head>
<title>CSS Test: CSSOM MediaList Interfaces</title>
<link rel="author" title="Chapman Shoop" href="mailto:chapman.shoop@gmail.com">
<link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> <!-- 2012-06-17 -->
<link rel="help" href="https://drafts.csswg.org/cssom/#the-medialist-interface">
<meta name="flags" content="dom">
<meta name="assert" content="MediaList object has deleteMedium method and it functions properly.">
<script src="/resources/testharness.js" type="text/javascript"></script>
<script src="/resources/testharnessreport.js" type="text/javascript"></script>
</head>
<body>
<noscript>Test not run - javascript required.</noscript>
<div id="log"></div>
<script type="text/javascript">
function setup() {
// Clean out any old style element
var old_style_el = document.getElementById('test_style');
if (old_style_el) {
document.head.removeChild(old_style_el);
}
// Create a fresh style element and return its media attribute
var style_el = document.createElement('style');
style_el.setAttribute('id', 'test_style');
document.head.appendChild(style_el);
return style_el.sheet.media;
}
</script>
<script type="text/javascript">
// MediaList.deleteMedium called without argument throws error.
test(function() {
media_list = setup();
assert_throws(new TypeError, function() { media_list.deleteMedium(); });
}, "deleteMedium_called_without_argument");
// MediaList.deleteMedium removes correct medium and updates corresponding properties.
test(function() {
media_list = setup();
media_list.appendMedium("screen");
media_list.appendMedium("all");
media_list.deleteMedium("screen");
assert_equals(media_list.length, 1);
assert_equals(media_list.item(0), "all");
assert_equals(media_list.mediaText, "all");
}, "deleteMedium_removes_correct_medium");
// MediaList.deleteMedium doesn't modify MediaList when medium is not found.
test(function() {
media_list = setup();
media_list.appendMedium("all");
assert_throws("NotFoundError", () => media_list.deleteMedium("screen"));
assert_equals(media_list.length, 1);
assert_equals(media_list.item(0), "all");
assert_equals(media_list.mediaText, "all");
}, "deleteMedium_no_matching_medium_to_remove");
</script>
</body>
</html>
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