<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"></div>

<div id="box2"></div>

<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);

assert_throws_dom('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>