122 lines
4.9 KiB
HTML
122 lines
4.9 KiB
HTML
<!DOCTYPE HTML>
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<meta charset=utf-8>
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<title>Element Timing: multiple images</title>
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<body>
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<style>
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body {
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margin: 0;
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}
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#img1 {
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display: block;
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margin-left: auto;
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margin-right: auto;
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}
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#img2 {
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margin-top:150px;
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margin-left:50px;
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}
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</style>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<script src="resources/element-timing-helpers.js"></script>
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<script>
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let beforeRender, image1Observed=0, image2Observed=0, image3Observed=0;
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async_test(function (t) {
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assert_implements(window.PerformanceElementTiming, "PerformanceElementTiming is not implemented");
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const observer = new PerformanceObserver(
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t.step_func(function(entryList) {
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entryList.getEntries().forEach( entry => {
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if (entry.identifier === 'image1') {
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if (image1Observed) {
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assert_unreached("Observer received image1 more than once");
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t.done();
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}
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image1Observed = 1;
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const pathname1 = window.location.origin + '/element-timing/resources/square100.png';
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// The images do not contain ID, so expect an empty ID.
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checkElement(entry, pathname1, 'image1', 'img1', beforeRender,
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document.getElementById('img1'));
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// This image is horizontally centered.
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// Using abs and comparing to 1 because the viewport sizes could be odd.
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// If a size is odd, then image cannot be in the pure center, but left
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// and right should still be very close to their estimated coordinates.
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assert_less_than_equal(Math.abs(entry.intersectionRect.left -
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(document.documentElement.clientWidth / 2 - 50)), 1,
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'left of rect for image1');
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assert_less_than_equal(Math.abs(entry.intersectionRect.right -
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(document.documentElement.clientWidth / 2 + 50)), 1,
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'right of rect for image1');
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assert_equals(entry.intersectionRect.top, 0, 'top of rect for image1');
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assert_equals(entry.intersectionRect.bottom,
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100, 'bottom of rect for image1');
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checkNaturalSize(entry, 100, 100);
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}
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else if (entry.identifier === 'image2') {
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if (image2Observed) {
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assert_unreached("Observer received image2 more than once");
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t.done();
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}
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image2Observed = 1;
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const pathname2 = window.location.origin + '/element-timing/resources/square20.png';
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checkElement(entry, pathname2, 'image2', 'img2', beforeRender,
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document.getElementById('img2'));
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// This image should be below image 1, and should respect the margin.
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checkRect(entry, [50, 250, 250, 450], "of image2");
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checkNaturalSize(entry, 20, 20);
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}
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else if (entry.identifier === 'image3') {
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if (image3Observed) {
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assert_unreached("Observer received image3 more than once");
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t.done();
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}
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image3Observed = 1;
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const pathname3 = window.location.origin + '/element-timing/resources/circle.svg';
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checkElement(entry, pathname3, 'image3', 'img3', beforeRender,
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document.getElementById('img3'));
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// This image is just to the right of image2.
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checkRect(entry, [250, 450, 250, 450], "of image3");
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checkNaturalSize(entry, 200, 200);
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}
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else {
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assert_unreached("Received an unexpected identifier.");
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t.done();
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}
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if (image1Observed && image2Observed && image3Observed) {
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t.done();
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}
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});
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})
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);
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observer.observe({entryTypes: ['element']});
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function addImage(number, source, width=0) {
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const img = document.createElement('img');
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img.src = source;
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// Set a different id and elementtiming value for each image.
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img.id = 'img' + number;
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img.setAttribute('elementtiming', 'image' + number);
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if (width !== 0)
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img.width = width;
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document.body.appendChild(img);
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}
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// Add the images during onload to be sure that the observer is registered in
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// time to observe the element timing.
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window.onload = () => {
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addImage(1, 'resources/square100.png');
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// Use requestAnimationFrame and a timeout to ensure that the images are
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// processed in the order we want.
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requestAnimationFrame( () => {
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t.step_timeout( () => {
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// Set the size equal to that of image3 to make positioning easier.
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addImage(2, 'resources/square20.png', 200);
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requestAnimationFrame( () => {
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t.step_timeout( () => {
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addImage(3, 'resources/circle.svg');
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}, 0);
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});
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}, 0);
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});
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beforeRender = performance.now();
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};
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}, 'PerformanceObserver can observe multiple image elements.');
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</script>
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</body>
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