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<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<!--
Transparent text should not be eligible for LCP.
-->
<style>
.large-transparent {
font-size: 2000px;
position: fixed;
top: 0;
left: 0;
padding: 0;
margin: 0;
pointer-events: none;
color: transparent;
z-index: -999;
}
</style>
<body>
<img src='/images/lcp-133x106.png' id='lcp' />
<p id="fake_lcp" class='large-transparent'>fake LCP</p>
<script>
const LcpEntryListPromise = (t) => {
return new Promise(resolve => {
new PerformanceObserver((entryList, observer) => {
if (entryList.getEntries().length > 0) {
resolve(entryList.getEntries());
observer.disconnect();
}
}).observe({ type: 'largest-contentful-paint', buffered: true });
});
}
promise_test(async t => {
assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
lcpEntries = await LcpEntryListPromise();
assert_equals(lcpEntries.length, 1, "There should only be 1 entry.");
assert_true(lcpEntries[0].url.includes('lcp-133x106.png'), "The LCP entry should be the image.");
}, "Transparent text should not be LCP.")
</script>
</body>
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