servo/tests/wpt/web-platform-tests/preload/link-header-preload-srcset.tentative.html.headers

Link: <resources/square.png?1x>; rel=preload; as=image; srcset="resources/square.png?2x 2x, resources/square.png?3x 3x"
Link: <resources/square.png?base>; rel=preload; as=image; srcset="resources/square.png?200 200w, resources/square.png?400 400w, resources/square.png?800 800w"; imgsizes=400px
Link: <resources/square.png?base>; rel=preload; as=image; srcset="resources/square.png?150 150w, resources/square.png?300 300w, resources/square.png?600 600w"; imgsizes="(min-width: 300px) 300px, 150px"