If you don't mind clarifying: What do you mean by "shown with the experimental flag?" Does this mean:
- The browser will accept "experimental-webgl" as a valid context type? (I think all WebGL enabled browser match this description)- The browser ONLY accepts "experimental-webgl"? (This sound like what you're talking about)- WebGL support in any form must be enabled with a flag on those browsers?
In the case of prefixed extensions, Chrome's policy is to no longer launch extensions with prefixes, though we will keep the prefixed versions around for older extensions. That doesn't necessarily apply to other browsers, however. I think Firefox said they would do the same as Chrome, but in Apple's case if they don't want to introduce a flag mechanism into the browser (which I'm sure they don't on iOS) prefixed extensions may be the only way they can expose draft extensions. Not that either of the cases you mentioned are still in draft status, I'm just saying there's still valid reasons to launch with a prefix.I think in the case of ATC textures we had implemented the extension back when prefixing was a thing, but there may have been some errors in the implementation that prevented it from showing up in the stats till more recently.