Highlighting a selected image in scrolled block

This tests for a regression against http://bugzilla.opendarwin.org/show_bug.cgi?id=6673 Selection highlight doesn't scroll along with an image contained in an overflow:scroll block.

There should be one contiguous highlight from “elit” to “Etiam”, including the orange square, and no other highlighted areas.

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Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Etiam et ipsum. Nam consectetuer mi eget velit. Sed nec risus vitae felis auctor ultricies. Pellentesque aliquet...