64 lines
No EOL
1.4 KiB
HTML
64 lines
No EOL
1.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<body>
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<title>Layout Instability: subframe layout shift score</title>
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<link rel="help" href="https://wicg.github.io/layout-instability/" />
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<style>
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#i {
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border: 0;
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position: absolute;
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left: 0;
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top: 0;
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background-color: pink;
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}
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</style>
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<iframe id="i" width="400" height="300" src="sub-frame.html"></iframe>
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<script>
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const loadPromise = new Promise(resolve => {
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window.addEventListener("load", () => {
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resolve(true);
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});
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});
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let iframe = document.getElementById('i');
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const load_promise = new Promise(resolve => {
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iframe.addEventListener('load', function() {
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resolve(true);
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});
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});
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checkMainFrameLoad = async () => {
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await loadPromise;
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return true;
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};
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checkIFrameLoad = async () => {
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// Wait for the iframe finishing loading
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await load_promise;
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return true;
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};
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promise_test(async t => {
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checkMainFrameLoad();
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// Wait for the iframe finishing loading
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checkIFrameLoad();
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// Wait for the message sent from the iframe after it receives all the layout
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// shifts.
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await new Promise(resolve => {
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window.addEventListener("message", (event) => {
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if (event.data.type == "layout shift score") {
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t.step(() => {
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assert_equals(event.data.score, event.data.expectedScore);
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});
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resolve();
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}
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}, false);
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});
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}, "");
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</script>
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</body>
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</html> |