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Cloud flare does do this. You get a screen saying checking your connection and it’s running hashes in your browser.

is it really running hashes, or is it probing your browser to see if your video card drivers look like phantomjs

I was actually quite curious about that and I found this.

>With a JS challenge, Cloudflare presents challenge page that requires no interaction from a visitor, but rather JavaScript processing by their browser.

>The visitor will have to wait until their browser finishes processing the JavaScript, which should be less than five seconds.

https://developers.cloudflare.com/fundamentals/get-started/c...

that permits both possibilities

WebGL, an important part of browser fingerprinting, takes a long time. Im sure there are other APIs being 'abused' for this purpose that take a while. This doesnt quite prove the PoW.

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