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<!DOCTYPE html>
<html>
<!-- Submitted from TestTWF Paris -->
<head>
<title>CSS Values and Units Test: Viewport units in scaled viewport</title>
<meta charset="UTF-8">
<meta name="assert" content="viewport relative units scale with viewport.">
<link rel="author" title="Emil A Eklund" href="mailto:eae@chromium.org">
<link rel="help" href="http://www.w3.org/TR/css3-values/#viewport-relative-lengths">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
iframe { border: 0; }
</style>
</head>
<body>
<div id="log"></div>
<iframe id="testFrame" src="javascript:void(0)"></iframe>
<script>
test(function() {
var frameElement = document.getElementById('testFrame');
var frameDocument = frameElement.contentDocument;
var testElement = frameDocument.createElement('div');
testElement.style.width = '50vw';
testElement.style.height = '50vh';
testElement.style.position = 'absolute';
testElement.style.left = '0';
testElement.style.top = '0';
testElement.style.backgroundColor = 'black';
frameDocument.body.appendChild(testElement);
var frameWidth = frameElement.getBoundingClientRect().width;
var frameHeight = frameElement.getBoundingClientRect().height;
for (var i = 1; i <= 200; i++) {
var scale = i / 100;
frameDocument.body.style.transform = 'scale(' + scale + ')';
var rect = testElement.getBoundingClientRect();
var actualWidth = rect.width;
var actualHeight = rect.height;
var expectedWidth = frameWidth * scale / 2;
var expectedHeight = frameHeight * scale / 2;
assert_approx_equals(actualWidth, expectedWidth, 0.1, '50vw at ' + scale + ' scale');
assert_approx_equals(actualHeight, expectedHeight, 0.1, '50vh at ' + scale + ' scale');
}
}, 'viewport relative units in scaled viewport');
</script>
</body>
</html>
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