PASS currentSrcFileName("img_before_source") is "blue_rect.jpg?1"
PASS document.getElementById("unknown_type").clientWidth is 1600
PASS currentSrcFileName("unknown_type") is "image-set-4x.png?3"
+PASS document.getElementById("svg_type").clientWidth is 800
+PASS currentSrcFileName("svg_type") is "image-set-2x.png?2"
PASS document.getElementById("empty_srcset").clientWidth is 1600
PASS currentSrcFileName("empty_srcset") is "image-set-4x.png?3"
PASS document.getElementById("no_srcset").clientWidth is 1600
PASS currentSrcFileName("no_srcset") is "image-set-4x.png?3"
some text
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+