72 lines
2 KiB
HTML
72 lines
2 KiB
HTML
<!doctype HTML>
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<html>
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<meta charset="utf8">
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<title>Content Visibility: resize observer interactions</title>
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<link rel="author" title="Chris Harrelson" href="mailto:chrishtr@chromium.org">
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<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
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<meta name="assert" content="content-visibility hidden subtrees do not trigger resize observer">
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<style>
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.hidden {
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content-visibility: hidden;
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}
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</style>
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<div id="container">
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<div id="resize" style="width: 50px; height: 50px">
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</div>
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</div>
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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>
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async_test(t => {
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let didCallback = false;
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function runTest() {
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let resizeCallback = function (entries) {
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didCallback = true;
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}
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let resizeObserver = new ResizeObserver(resizeCallback);
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resizeObserver.observe(resize);
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requestAnimationFrame(t.step_func(step2));
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}
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function step2() {
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assert_true(didCallback, 'Resize observation should happen in first frame after registering');
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didCallback = false;
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const container = document.getElementById("container");
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container.classList.add("hidden");
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// Change the size of #resize. This should cause a resize observation, but
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// only when the element becomes unhidden.
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resize.style.width = '100px';
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requestAnimationFrame(t.step_func(step3));
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}
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function step3() {
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assert_false(didCallback, 'ResizeObsever should not run during while unrendered');
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requestAnimationFrame(t.step_func(step4));
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}
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function step4() {
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assert_false(didCallback, 'ResizeObsever should not run while unrendered');
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const container = document.getElementById("container");
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container.classList.remove("hidden");
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requestAnimationFrame(t.step_func_done(step5));
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}
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function step5() {
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assert_true(didCallback, 'ResizeObsevers should now run once becoming visible');
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}
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window.onload = function() {
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requestAnimationFrame(() => requestAnimationFrame(t.step_func(runTest)));
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};
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}, "ResizeObserver skipped while hidden");
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</script>
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</html>
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