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diff --git a/layout/reftests/bugs/670442-1-ref.html b/layout/reftests/bugs/670442-1-ref.html
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+++ b/layout/reftests/bugs/670442-1-ref.html
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+<!DOCTYPE html>
+<html>
+ <body>
+ <div>
+ <canvas id="c1" width="400" height="400"></canvas>
+ <canvas id="c2" width="400" height="400"></canvas>
+ </div>
+ <script type="text/javascript">
+ var canv1 = document.getElementById('c1');
+ var canv2 = document.getElementById('c2');
+ var ctx1 = canv1.getContext('2d');
+ var ctx2 = canv2.getContext('2d');
+
+ ctx1.strokeStyle = '#FF0000';
+ ctx1.moveTo(10, 10);
+ ctx1.lineTo(390, 390);
+ ctx1.stroke();
+
+ function doTest()
+ {
+ // Save img data
+ var imgData = ctx1.getImageData(0, 0, canv1.width, canv1.height);
+
+ // Resize canvas - seems to cause the bug
+ canv1.width = 0;
+ canv1.height = 0;
+ canv1.width = 400;
+ canv1.height = 400;
+
+ // Put image data from ctx1 to ctx2
+ ctx2.putImageData(imgData, 0, 0);
+
+ // Draw canvas2 on canvas1
+ ctx1.drawImage(canv2, 0, 0);
+ };
+
+ doTest();
+ </script>
+ </body>
+</html>