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<!doctype html>
<html>
<head>
<title>Viewport: Scrollbars Cause Resize</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, minimum-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="viewport_support.js"></script>
</head>
<body>
<h1>Viewport: Scrollbars Cause Resize</h1>
<h4>
Test Description: This test checks that the appearance of classic
scrollbars will cause a resize event to be fired at window.visualViewport.
</h4>
<script>
setup({ explicit_done: true });
function runTest() {
var scrollbarThickness = calculateScrollbarThickness();
document.documentElement.style.overflow = "hidden";
var initialWidth = visualViewport.width;
var initialHeight = visualViewport.height;
test(function() {
assert_equals(window.visualViewport.width, window.innerWidth);
assert_equals(window.visualViewport.height, window.innerHeight);
}, "view size initially matches window size");
var t = async_test(
"Resize event was fired at window.visualViewport if, and only if, " +
"scrollbars are classic (i.e. affect flow)");
var viewResized = false;
window.visualViewport.addEventListener('resize', function() {
viewResized = true;
});
requestAnimationFrame(t.step_func_done(function() {
assert_equals(viewResized, scrollbarThickness > 0);
}));
document.documentElement.style.overflow = "";
document.body.style.width = "10000px";
document.body.style.height = "10000px";
var expectedWidth = initialWidth - scrollbarThickness;
var expectedHeight = initialHeight - scrollbarThickness;
test(function() {
assert_equals(window.visualViewport.width, expectedWidth);
assert_equals(window.visualViewport.height, expectedHeight);
}, "view size reflects appearance of classic scrollbars");
document.body.style.width = "";
document.body.style.height = "";
}
// Run the test after load to make sure any resize from a previous test
// or from the load doesn't interfere.
window.onload = requestAnimationFrame(function() {
try {
runTest();
} finally {
done();
}
});
</script>
<div id="log"></div>
</body>
</html>
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