WebAIM: Color Contrast Checker - 0 views
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WAVE can analyze contrast ratios for all page elements at once.
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Colorzilla is an excellent tool for extracting the color value from any page element.
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You can append ?fcolor=0000ff&bcolor=ff0000 (where the fcolor value is the foreground color and the bcolor value is the background color) to the URL of this page to analyze colors directly from a link or URL (link example).