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Re:Google Docs will now use canvas based rendering by zo1 on Wednesday May 12, 2021 @11:01AM (#27131134)
Assuming they allow you programmatic access to the elements inside their binary blob rendered in the canvas. My bet is they won't.
Re:Google Docs will now use canvas based rendering by cnity on Wednesday May 12, 2021 @11:35AM (#27131526)
They couldn't stop you: either the interaction is handled in JS (in which case you can programmatically call the JS) or it is handled in WASM (in which case the interaction is actually still handled in JS, and exposed WASM functions are called).

In neither case can programmability be blocked.