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<!doctype html>
<html>
<head>
<title>Viewport: Resize Event On Load Overflowing Page</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>
<script>
// This first case ensures that we load into the same kind of
// viewport. If the previous test had a page-scale factor set or a
// different viewport <meta> we might get a resize because of that.
if (location.search === "") {
window.addEventListener('load', function() {
var url = window.location.href + "?reloaded";
window.location.href = url;
});
} else {
var t = async_test(
"Resize event fired exactly once against window.visualViewport if " +
"scrollbars affect layout.");
var numViewResizes = 0;
window.visualViewport.addEventListener('resize', function() {
numViewResizes++;
});
window.addEventListener('load', function() {
requestAnimationFrame(function() {
requestAnimationFrame(
t.step_func_done(function() {
var isOverlay = calculateScrollbarThickness() == 0;
assert_equals(numViewResizes, isOverlay ? 0 : 1);
}));
});
});
}
</script>
<style>
html {
height: 100%;
}
body {
/* Ensure overflow */
height: 200%;
}
#log {
overflow: auto;
}
</style>
</head>
<body>
<h1>Viewport: Resize Event On Load Overflowing Page</h1>
<h4>
Test Description: This test ensures that we fire a resize event against
window.visualViewport if the page has overflow (since this creates a scrollbar
and thus changes the viewport size).
</h4>
<div id="log"></div>
</body>
</html>
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