Addy Osmani on Twitter: "Great guide to CSS mask-image: https://t.co/fWLWAGdVvM ~ specify an image or gradient to use as a mask layer. By @rachelandrew https://t.co/QOptFxOHSa" / Twitter
CSS masking - javatpoint
CSS Mask and Clip-path property Effect on Images | Quick Guide
CSS Masks | WebKit
Why this -webkit-mask-image with linear gradient value causes images to not display - HTML-CSS - The freeCodeCamp Forum