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<!DOCTYPE html>
<html>
<head>
<title>CSSOM: CSSStyleDeclaration is mutable and immutable in various settings</title>
<link rel="author" title="Paul Irish" href="mailto:paul.irish@gmail.com">
<link rel="reviewer" title="Ms2ger" href="mailto:ms2ger@gmail.com"> <!-- 2012-06-17 -->
<link rel="help" href="http://www.w3.org/TR/cssom-1/#the-cssstyledeclaration-interface">
<meta name="flags" content="dom">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id="log"></div>
<div id="box"></box>
<div id="box2"></box>
<style id="teststyles">
#box2 { width: 15px; }
</style>
<script>
test(function(){
var elem = document.getElementById('box');
elem.style.width = '10px';
assert_equals(elem.style.width, '10px', 'setting via style property');
elem.style.width = '';
elem.style.cssText = 'width: 10px';
assert_equals(elem.style.width, '10px', 'setting via cssText');
elem.style.width = '';
}, 'HTMLElement\'s CSSStyleDeclaration is mutable')
test(function(){
var elem = document.getElementById('box');
var style = getComputedStyle(elem, 'width');
assert_throws('NO_MODIFICATION_ALLOWED_ERR', function(){
style.width = '10px';
});
}, 'getComputedStyle\'s CSSStyleDeclaration is not mutable')
test(function(){
var style = document.getElementById('teststyles').sheet.cssRules[0].style;
assert_equals(style.width, '15px', 'width value is correct');
style.width = '25px';
assert_equals(style.width, '25px', 'width value is mutable');
var gCSstyle = getComputedStyle(document.getElementById('box2'));
assert_equals(gCSstyle.width, '25px', 'styleSheet change is live and accesible via getComputedStyle');
}, 'StyleSheet\'s CSSStyleDeclaration is mutable');
</script>
</body>
</html>
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