I had to put in a lot of effort to write a useable slide rendering engine for my presentation app SlideMagic that was super precise, scales up and down without

I had to put in a lot of effort to write a useable slide rendering engine for my presentation app SlideMagic that was super precise, scales up and down without issues, and still enabled clicking things in the UI. If Google has a good canvas-based engine, hopefully they will open source it as a new standard.