Hacker News Reader

I was also seeing only 97% in Firefox.

Disabling the LastPass add-on brought it to 100%. I'm guessing you also use LastPass?

That's a very fingerprintable observation.

Most rendering oddities are not directly detectable by JS on the page, with the notable exception of the <canvas> element.

Though I suppose rendering differences that affect z-order or visibility could be detected indirectly, by listening for pointer events on elements that are "supposed to be" visible/hidden.

Isn't one of the main uses of JS to get the contents of elements on the page? That "97%" and "100%" would be clearly evident.

You are of course correct. I should not try to think about software at 4am! :)

You're right, disable LastPass and I get a 100%... Strange.

Reply on news.ycombinator.com