gecko/content/canvas/test/webgl/extra/offscreen-issue.html

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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<script type="text/javascript">
window.onload = function() {
setup("1");
setup("2");
}
function setup(id) {
var c = document.getElementById(id);
var names = ["webgl", "experimental-webgl"];
for (var i = 0; i < names.length; ++i) {
gl = canvas.getContext(names[i]);
if (gl) {
break;
}
}
gl.clearColor(1,0,0,1);
gl.clear(gl.COLOR_BUFFER_BIT);
setTimeout(function() {
gl.enable(gl.SCISSOR_TEST);
gl.scissor(0,0,50,50);
gl.clearColor(0,1,0,1);
gl.clear(gl.COLOR_BUFFER_BIT);
}, 500);
}
</script>
</head>
<body>
<canvas id="1"></canvas>
<div style="height:4000px;">content that is tall like several articles</div>
<canvas id="2"></canvas>
</body>
</html>