What’s with all the negativity? I didn’t remotely suggest that WebGL or canvas ever lacked compositing, so I’m pretty confused by your response and where the attempted insult came from, or why. Maybe you’ve misunderstood. Browsers can composite elements without using WebGL or canvas, so sure most devs should know that. And, turns out they do. But most devs never need to interact directly with canvas or WebGL, so why would they know about the specific compositing modes? Most of the small number of people who do use WebGL or Canvas have never used any of the other Porter-Duff compositing modes other than “over”, and most of them have never used premultiplied alpha. It seems like no surprise at all that most people don’t know the minutiae and trivialities of what browsers can do using APIs that the majority of devs don’t use. To flip that around, there are plenty of WebGL devs who know compositing modes and yet barely know anything about browser networking, security, and caching features.