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What about visibility: hidden?

What about background: transparent?

What about background: url(transparent.png)?

What about background: data:encoded-transparent-image...

Even browser-side "visibility" calculations can become an AI-level problem quickly.

There is an easy solution to the AI calculation though.

Anything not proven visible counts as invisible. Done!

Anything not "proven invisible"? So... any text on any image background? Any colored text on any background? (white text on white background...)