Cross-Browser Grayscale image example using CSS3 + JS v2.0
With browser feature detection using Modernizr
Tested and should work on Firefox 3.5+, Chrome, Safari 4+, Opera 9+, Internet Explorer 7, 8, 9, 10, 11 and Microsoft Edge
If you are running Microsoft Edge please make sure that you activate CSS filters via about:flags
(hover over these images using your mouse to toggle grayscale)