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<!doctype html>
<html>
<head>
<title>Viewport: Resize Event On Iframe Size Change</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>
async_test(t => {
document.addEventListener("DOMContentLoaded", () => {
let iframe = document.querySelector("iframe");
onload = () => {
requestAnimationFrame(() => { requestAnimationFrame(() => {
// First full rendering update is complete.
let resize_event_count = 0;
iframe.contentWindow.visualViewport.addEventListener("resize", () => {
resize_event_count++;
});
iframe.style.width = "200px";
iframe.clientWidth;
requestAnimationFrame(() => {
t.step(() => {
assert_equals(resize_event_count, 1);
t.done();
});
}) }); // 2x requestAnimationFrame
})
};
});
}, "Resize event fired when an iframe is resized.");
</script>
</head>
<body>
<h1>Viewport: Resize Event On Iframe Size Change</h1>
<h4>
Test Description: This test ensures that we fire a resize event when
the size of an iframe changes.
</h4>
<iframe srcdoc="<p>Hello, world!</p>"></iframe>
<div id="log"></div>
</body>
</html>
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