Puppeteer Deterministic Screenshot

Are Puppeteer screenshots deterministic given the same input HTML? Let's find out by setting up Github Actions to run the same Puppeteer screenshot generating script and comparing the binary files.

Deterministic Across OSs

It is impossible for the screenshots to be deterministic across OSs due to the different text rendering technologies employed by the different OSs.

This work is not exploring this, but there might be an angle in forcing the same font across OSs and forcing software rendering in Chrome, which might fall back onto the same text renderer.

Deterministic Across Runs on the Same OS

This is what we're after: if the same script is ran twice on the same machine and the same HTML is used, will the generated screenshot file be the same?

Is this true for all OSs?

OS	Result
Windows	Screenshots are the same across runs
Linux	?
macOS	?

Bonus: Git Changes

Git won't track the screenshot as changed if it changes only in metadata, but not the binary data.

To-Do

Consider looking into the software rendering angle described above

Fix the GitHub Actions Git push failing due to concurency issues (probably)

Maybe store in GitHub Actions artifacts as an alternative, but I'd like to fix this too, as it should come in handy.