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async_test(t => {
assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
const observer = new PerformanceObserver(
t.step_func(entryList => {
entryList.getEntries().forEach(entry => {
// May receive a text entry. Ignore that entry.
if (!entry.url) {
return;
}
// The images should not have caused an entry, so fail test.
assert_unreached('Should not have received an entry! Received one with id '
+ entryList.getEntries()[0].id);
});
})
);
observer.observe({type: 'largest-contentful-paint', buffered: true});
// Images have been added but should not cause entries to be dispatched.
// Wait for 500ms and end test, ensuring no entry was created.
t.step_timeout(() => {
t.done();
}, 500);
}, 'Images with opacity: 0, visibility: hidden, or display: none are not observable by LargestContentfulPaint.');