nick.jpg has MIME type image/jpeg nick.jpg has MIME type image/jpeg This test verifies that an image which is prefetched, and which is also contained as a subresource of the current document can be loaded correctly as a subresource. See bug 49236 in which this wasn't working. When this test succeeds, you'll see an image of Nick on a sailboat immediately below this text. When this test fails, you will see no images at all. NICK_ONLOAD called NICK_ONLOAD called SUCCESS. Two loads.