Bug 290921: text-decoration must not apply to images

Test passes if this orange square image is not underlined.

Reference: "This property describes decorations that are added to the text of an element using the element's color. (...) Underlines, overlines, and line-throughs are applied only to text (including white space, letter spacing, and word spacing): margins, borders, and padding are skipped. User agents must not render these text decorations on content that is not text. For example, images and inline blocks must not be underlined."

CSS 2.1, section 16.3.1, Underlining, overlining, striking, and blinking: the 'text-decoration' property

Related current CSS 2.1 test suite test on text-decoration