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<!doctype html>
<title>Largest Contentful Paint IDL tests</title>
<link rel="help" href="https://wicg.github.io/largest-contentful-paint/">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/WebIDLParser.js"></script>
<script src="/resources/idlharness.js"></script>
<script>
'use strict';
idl_test(
['largest-contentful-paint'],
['performance-timeline', 'dom', 'hr-time'],
async (idl_array, t) => {
idl_array.add_objects({
LargestContentfulPaint: ['lcp']
});
window.lcp = await new Promise((resolve, reject) => {
const observer = new PerformanceObserver(entryList => {
resolve(entryList.getEntries()[0]);
});
observer.observe({type: 'largest-contentful-paint', buffered: true});
t.step_timeout(() => reject('Timed out waiting for LargestContentfulPaint entry'), 3000);
});
}
);
</script>
<!-- a contentful element to observe -->
<img src=/images/green-100x50.png>
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