<html><head> <title>Bug 449653 - drawWindow on canvas fails on load, draws white instead of specified region</title> <style> html, body { margin: 0px; padding: 0px; } </style> </head><body> <div style="width: 100px; height: 100px; background-color: lime;"></div> <br> <canvas id="canvas" width="100" height="100" style="background-color: red;"></canvas> <script> var canvas = document.getElementById("canvas"); var ctx = canvas.getContext("2d"); SpecialPowers.wrap(ctx).drawWindow(window, 0, 0, 100, 100, "white"); </script> </body></html>