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<!DOCTYPE html> <html> <head> <style> .mask1 { -webkit-mask-image: url(w3logo.png); mask-image: url(w3logo.png); -webkit-mask-size: 70%; mask-size: 70%; -webkit-mask-repeat: no-repeat; mask-repeat: no-repeat; mask-mode: luminance; } .mask2 { -webkit-mask-image: url(w3logo.png); mask-image: url(w3logo.png); -webkit-mask-size: 70%; mask-size: 70%; -webkit-mask-repeat: no-repeat; mask-repeat: no-repeat; mask-mode: alpha; } </style> </head> <body> <h1>The mask-mode Property</h1> <p><strong>Note:</strong> The mask-mode property only works in Firefox!</p> <h3>Let the mask layer image be treated as a luminance mask:</h3> <div class="mask1"> <img src="img_5terre.jpg" alt="Cinque Terre" width="600" height="400"> </div> <h3>Let the mask layer image be treated as an alpha mask:</h3> <div class="mask2"> <img src="img_5terre.jpg" alt="Cinque Terre" width="600" height="400"> </div> <h3>Original image:</h3> <img src="img_5terre.jpg" alt="Cinque Terre" width="600" height="400"> </body> </html>