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38 lines
1.4 KiB
HTML
38 lines
1.4 KiB
HTML
<!DOCTYPE html>
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<html>
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<meta charset=utf-8 />
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<title>Element Timing: buffer elements before onload</title>
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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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<body>
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<img src=resources/slow-image.py?name=square20.png&sleep=500>
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<script>
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/*
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In this test, a slow image is added to the frame to delay onload. The entry
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for the other image should be available before onload, and thus delivered to
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the performance timeline.
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*/
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async_test(function(t) {
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beforeRender = performance.now();
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const img = document.createElement('img');
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img.src = 'resources/square20.jpg';
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img.setAttribute('elementtiming', 'my_image');
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img.setAttribute('id', 'my_id');
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document.body.appendChild(img);
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window.onload = t.step_func_done( () => {
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const entries = performance.getEntriesByType('element');
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assert_greater_than_equal(entries.length, 1);
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assert_equals(performance.getEntries().filter(e => e.identifier === 'my_image').length, 1);
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const entry = entries[0];
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const index = window.location.href.lastIndexOf('/');
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const pathname = window.location.href.substring(0, index) +
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'/resources/square20.jpg';
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checkElement(entry, pathname, 'my_image', 'my_id', beforeRender);
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checkNaturalSize(entry, 20, 20);
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});
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}, "Element Timing: image loads before onload.");
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</script>
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</body>
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</html>
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