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chromium/third_party/blink/web_tests/fast/hidpi/image-srcset-simple-1x-expected.txt 

PASS successfullyParsed is true

TEST COMPLETE

PASS document.getElementById("foo").clientWidth==400 is true
This test passes if the image below says 1x with a reddish background when the deviceScaleFactor is 1, and if says 2x with a greenish background when the deviceScaleFactor is 2.