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41 lines
1.3 KiB
HTML
41 lines
1.3 KiB
HTML
<!DOCTYPE html>
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<head>
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<title>Performance Paint Timing Test: FCP due to canvas</title>
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</head>
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<body>
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<script src="/resources/testharness.js"></script>
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<script src="/resources/testharnessreport.js"></script>
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<canvas id="canvas" width="200" height="200" ></canvas>
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<script>
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async_test(function (t) {
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const canvas = document.getElementById("canvas");
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const context = canvas.getContext("2d");
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context.beginPath();
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context.moveTo(0,0);
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context.lineTo(300,150);
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context.stroke();
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function testPaintEntries() {
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const bufferedEntries = performance.getEntriesByType('paint');
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if (bufferedEntries.length < 2) {
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t.step_timeout(function() {
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testPaintEntries();
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}, 20);
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return;
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}
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t.step(function() {
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assert_equals(bufferedEntries.length, 2, "There should be two paint timing instances.");
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assert_equals(bufferedEntries[0].entryType, "paint");
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assert_equals(bufferedEntries[0].name, "first-paint");
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assert_equals(bufferedEntries[1].entryType, "paint");
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assert_equals(bufferedEntries[1].name, "first-contentful-paint");
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t.done();
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});
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};
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t.step(function() {
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testPaintEntries();
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});
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}, "First contentful paint fires due to canvas render.");
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</script>
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</body>
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</html>
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