Do not call window.getComputedStyles on non Elements
Don't swallow errors in Test. Print them to window.error
Strip both single and double quotation marks from the URL string of a background image CSS url() source
Fix the cssTextHasContrast HTML file be removing absolute placement of background images
Merge branch 'cssTextHasContrast' into wcag2

Conflicts:
	src/js/components/color.js