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<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: invisible images are not observable</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#opacity0 {
opacity: 0;
}
#visibilityHidden {
visibility: hidden;
}
#displayNone {
display: none;
}
</style>
<script>
async_test(function (t) {
assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
const observer = new PerformanceObserver(
t.step_func_done((entries) => {
// The image should not have caused an entry, so fail test.
assert_unreached('Should not have received an entry! Received one with identifier '
+ entries.getEntries()[0].identifier);
})
);
observer.observe({entryTypes: ['element']});
// We add the images during onload to be sure that the observer is registered
// in time for it to observe the element timing.
window.onload = () => {
const img = document.createElement('img');
img.src = 'resources/square100.png';
img.setAttribute('elementtiming', 'my_image');
img.setAttribute('id', 'opacity0');
document.body.appendChild(img);
const img2 = document.createElement('img');
img2.src = 'resources/square20.png';
img2.setAttribute('elementtiming', 'my_image2');
img2.setAttribute('id', 'visibilityHidden');
document.body.appendChild(img2);
const img3 = document.createElement('img');
img3.src = 'resources/circle.svg';
img3.setAttribute('elementtiming', 'my_image3');
img3.setAttribute('id', 'displayNone');
document.body.appendChild(img3);
const div = document.createElement('div');
div.setAttribute('id', 'opacity0');
const img4 = document.createElement('img');
img4.src = '/images/blue.png';
img4.setAttribute('elementtiming', 'my_image4');
div.appendChild(img4);
document.body.appendChild(div);
const div2 = document.createElement('div');
div2.setAttribute('id', 'visibilityHidden');
const img5 = document.createElement('img');
img5.src = '/images/blue.png';
img5.setAttribute('elementtiming', 'my_image5');
div.appendChild(img5);
document.body.appendChild(div2);
const div3 = document.createElement('div');
div3.setAttribute('id', 'displayNone');
const img6 = document.createElement('img');
img6.src = '/images/blue.png';
img6.setAttribute('elementtiming', 'my_image6');
div.appendChild(img6);
document.body.appendChild(div3);
// 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.');
</script>
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