For a more truly "web-native" treatment of math, see https://www.mathacademy.com/ https://www.mathacademy.com/. I've also heard good stuff about https://physics

For a more truly "web-native" treatment of math, see https://www.mathacademy.com/ https://www.mathacademy.com/. I've also heard good stuff about https://physicsgraph.com/ https://physicsgraph.com/ for physics.