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<!DOCTYPE html>
<!-- Check that resizing a (potentially accelerated) canvas properly clears its
contents even if the layout size of the canvas does not change. Expected
output is a blank canvas.
https://bugs.webkit.org/show_bug.cgi?id=80871 -->
<html>
<head>
<style>
#canvas {
outline: solid 1px black;
width: 300px;
height: 300px;
}
</style>
<script src="../../resources/run-after-layout-and-paint.js"></script>
<script>
if (window.testRunner) {
testRunner.dumpAsTextWithPixelResults();
testRunner.waitUntilDone();
}
function runTest() {
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
ctx.fillStyle = 'red';
ctx.fillRect(0, 0, 300, 300);
runAfterLayoutAndPaint(repaintTest);
}
function repaintTest() {
var canvas = document.getElementById('canvas');
// This changes the resolution of the canvas but keeps its layout size constant.
canvas.width = canvas.width / 2;
if (window.testRunner)
testRunner.notifyDone();
}
</script>
</head>
<body onload="runTest();">
<canvas id="canvas" width="300" height="300"/>
</body>
</html>
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