47 lines
1.9 KiB
HTML
47 lines
1.9 KiB
HTML
<!DOCTYPE HTML>
|
|
<meta charset=utf-8>
|
|
<title>Element Timing: intersectionRect when image overflows</title>
|
|
<body>
|
|
<style>
|
|
body {
|
|
margin: 200px 100px;
|
|
}
|
|
</style>
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
<script src="resources/element-timing-helpers.js"></script>
|
|
<script>
|
|
let beforeRender;
|
|
let img;
|
|
async_test(function (t) {
|
|
assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
|
|
const observer = new PerformanceObserver(
|
|
t.step_func_done(function(entryList) {
|
|
assert_equals(entryList.getEntries().length, 1);
|
|
const entry = entryList.getEntries()[0];
|
|
const pathname = window.location.origin + '/element-timing/resources/square20.png';
|
|
checkElement(entry, pathname, 'not_fully_visible', '', beforeRender, img);
|
|
// Image will not be fully visible. It should start from the top left part
|
|
// of the document, excluding the margin, and then overflow.
|
|
checkRect(entry,
|
|
[100, document.documentElement.clientWidth, 200, document.documentElement.clientHeight]);
|
|
checkNaturalSize(entry, 20, 20);
|
|
})
|
|
);
|
|
observer.observe({entryTypes: ['element']});
|
|
// We add the image during onload to be sure that the observer is registered
|
|
// in time for it to observe the element timing.
|
|
window.onload = () => {
|
|
// Add an image setting width and height equal to viewport.
|
|
img = document.createElement('img');
|
|
img.src = 'resources/square20.png';
|
|
img.setAttribute('elementtiming', 'not_fully_visible');
|
|
img.width = document.documentElement.clientWidth;
|
|
img.height = document.documentElement.clientHeight;
|
|
document.body.appendChild(img);
|
|
beforeRender = performance.now();
|
|
};
|
|
}, 'The intersectionRect of an img element overflowing is computed correctly');
|
|
</script>
|
|
|
|
</body>
|