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<!doctype html>
<meta charset="utf-8">
<link rel="author" title="Emilio Cobos Álvarez" href="mailto:emilio@crisal.io">
<link rel="author" title="Mozilla" href="https://mozilla.org">
<link rel="help" href="https://drafts.csswg.org/css-values/#viewport-relative-lengths">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body style="display: none">
<script>
promise_test(async function() {
let frame = document.createElement("iframe");
let load = new Promise(resolve => {
frame.addEventListener("load", resolve);
});
frame.setAttribute("scrolling", "no");
frame.setAttribute("frameborder", "0");
frame.style.width = "100px";
frame.style.height = "100px";
frame.srcdoc = `
<!doctype html>
<style>
body { margin: 0 }
#parent, #child { width: 100vw; height: 100vh; }
</style>
<div id="parent">
<div id="child"></div>
</div>
`;
document.body.appendChild(frame);
await load;
{
let resize = new Promise(resolve => {
frame.contentWindow.addEventListener("resize", resolve);
});
document.body.style.display = "";
await resize;
}
let doc = frame.contentDocument;
function assertDimensions(expected, description) {
for (let id of ["parent", "child"]) {
let element = doc.getElementById(id);
let rect = element.getBoundingClientRect();
assert_equals(rect.width, expected, `${description}: ${id} width`);
assert_equals(rect.height, expected, `${description}: ${id} height`);
}
}
assertDimensions(100, "before resize");
let resize = new Promise(resolve => {
frame.contentWindow.addEventListener("resize", resolve);
});
frame.style.width = "200px";
frame.style.height = "200px";
await resize;
assertDimensions(200, "after resize");
})
</script>
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