<!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="120" 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(5000, 0, 10000, 5000); var container = document.getElementById("container"); container.scrollLeft = 5010; container.scrollTop = 10; </script> </body> </html>