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chromium/third_party/blink/web_tests/fast/webgl/offscreenCanvas-transferToImageBitmap-invalid-mailbox-expected.html 

<!DOCTYPE html>
<html>
<body>
<canvas id='output1' width='100' height='100' style='background:red'></canvas>
<canvas id='output2' width='100' height='100'></canvas>
</body>
</html>