Browser-based games died with the death of flash. WebGL(2) didn't bring them back, and WebGPU isn't going to, either.
Adobe Flash Professional still exists as Adobe Animate: https://www.adobe.com/products/animate.html
Useful for exporting movie and packaging assets / animations to then be consumed by a custom engine but not worth the effort that much when you have spine, etc. which are better supported and used in the industry.
Scaleform still seems to be used by some AAA studio (I'm always surprised to see it) but I can't imagine it they will continue to use it for long.
Also, you can add support for notifications, and for the developer there are more options for monetization.
If you are only targeting the web, you're better off with a game engine specific to the web.