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<!DOCTYPE html>
<html>
<head>
<title>CSS Test: getComputedStyle on blocks with auto margins</title>
<link rel="author" title="Brad Werth" href="mailto:bwerth@mozilla.com">
<link rel="help" href="https://drafts.csswg.org/cssom/#dom-window-getcomputedstyle" />
<meta name="assert" content="getComputedStyle produces pixel values for margin: auto blocks">
<script src="/resources/testharness.js" type="text/javascript"></script>
<script src="/resources/testharnessreport.js" type="text/javascript"></script>
<style>
x {
display: block;
position: relative;
background: grey;
width: 60px;
height: 10px;
}
y {
display: block;
background: blue;
width: 40px;
height: 10px;
margin: auto;
}
#absolute {
position: absolute;
left: 0;
right: 0;
}
#relative {
position: relative;
}
</style>
</head>
<body>
<div id="log"></div>
<x><y id="absolute"></y></x>
<x><y id="relative"></y></x>
<script type="text/javascript">
let idsToTest = [
"absolute",
"relative",
];
for (let id of idsToTest) {
let elem = document.getElementById(id);
let elemStyle = window.getComputedStyle(elem);
// positioned element's auto margins should be resolved to 10px.
test(function() {
assert_equals(elemStyle.getPropertyValue("margin-left"), "10px");
assert_equals(elemStyle.getPropertyValue("margin-right"), "10px");
}, id + "_computed_margins");
// positioned element should have a left and right of 0px (as authored).
test(function() {
assert_equals(elemStyle.getPropertyValue("left"), "0px");
assert_equals(elemStyle.getPropertyValue("right"), "0px");
}, id + "_computed_left_and_right");
}
</script>
</body>
</html>
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