servo/tests/wpt/web-platform-tests/element-timing/observe-background-image.html

37 lines
1.2 KiB
HTML

<!DOCTYPE HTML>
<meta charset=utf-8>
<title>Element Timing: observe element with background image</title>
<body>
<style>
body {
margin: 0;
}
#target {
width: 100px;
height: 50px;
background-image: url('/images/black-rectangle.png');
}
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="resources/element-timing-helpers.js"></script>
<script>
let beforeRender = performance.now();
async_test(function (t) {
const observer = new PerformanceObserver(
t.step_func_done(function(entryList) {
assert_equals(entryList.getEntries().length, 1);
const entry = entryList.getEntries()[0];
const index = window.location.href.lastIndexOf('/');
const pathname = window.location.href.substring(0, index - 14) +
'images/black-rectangle.png';
checkElement(entry, pathname, 'my_div', 'target', beforeRender);
checkRect(entry, [0, 100, 0, 50]);
checkNaturalSize(entry, 100, 50);
})
);
observer.observe({entryTypes: ['element']});
}, 'Element with elementtiming attribute and background image is observable.');
</script>
<div id='target' elementtiming='my_div'></div>
</body>