LayoutTests/fast/css/CSSStyleDeclaration-property-setter.html

<!DOCTYPE html>
<html>
<body>
<script src="../../resources/js-test-pre.js"></script>
<script>
description("Test that setting CSS properties via CSSStyleDeclaration behaves as expected");

var div = document.createElement("div");
shouldBeEqualToString("div.style.cssText", "");
evalAndLog("div.style.backgroundColor = 'red'");
shouldBeEqualToString("div.style.cssText", "background-color: red;");
shouldBeEqualToString("div.style.getPropertyValue('background-color')", "red");
shouldBe("div.style.length", "1");

debug("");
// Setting to empty string should delete the property.
evalAndLog("div.style.backgroundColor = ''");
shouldBeEqualToString("div.style.cssText", "");
shouldBeEqualToString("div.style.getPropertyValue('background-color')", "");
shouldBe("div.style.length", "0");

debug("");
evalAndLog("div.style.backgroundColor = 'red'");
shouldBeEqualToString("div.style.cssText", "background-color: red;");
shouldBeEqualToString("div.style.getPropertyValue('background-color')", "red");
shouldBe("div.style.length", "1");

debug("");
// Setting to null should delete the property (null is treated as the empty string).
evalAndLog("div.style.backgroundColor = null");
shouldBeEqualToString("div.style.cssText", "");
shouldBeEqualToString("div.style.getPropertyValue('background-color')", "");
shouldBe("div.style.length", "0");
</script>
<script src="../../resources/js-test-post.js"></script>
</body>
</html>