gecko-dev/layout/reftests/bugs/632781-verybig.html

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HTML

<!DOCTYPE html>
<html>
<body>
<!--
This test makes sure that scrolling a huge canvas would correctly scroll
its contents. We don't accelerate extremely large canvases because of
GPU maximum texture size limits, so this test makes sure that the
non-accelerated code path for this operation works correctly.
The padding in this test is added mostly to make sure that scrollLeft/Top
correctly skip the padding.
-->
<div id="container" style="width: 100px; height: 100px; padding: 10px; overflow: hidden">
<canvas width="10000" height="10000" id="c"></canvas>
</div>
<script>
var ctx = document.getElementById("c").getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(0, 0, 10000, 5000);
ctx.fillStyle = "green";
ctx.fillRect(0, 5000, 10000, 5000);
var container = document.getElementById("container");
container.scrollLeft = 10;
container.scrollTop = 5010;
</script>
</body>
</html>