Why does firefox show an offset on cursor position?

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This is a weird one but I thought I'd post it here for fun and because it is so annoying. Maybe someone else has seen it too.

Here's the deal.
I run:
Ubuntu 20.04
FireFox 82.0.3 64-bit (just updated today) (problem was happening in previous versions too)
When I scroll the page up on the LinkedIn web site then the cursor location is offset from where I actually see the cursor floating.

That's confusing. The point is that you will see buttons and links activating when the cursor is nowhere near them (some offset distance) and then when you float over them the links and buttons are not activated.

It's all so confusing but I captured this video (very difficult to capture it).
Check it out and see what you think. It's quite insidious.

Offset Cursor - FireFox running on Ubuntu 20.04 - YouTube[^]

What I have tried:

Made a video to prove that it's happening. :D

Posted 11-Nov-20 3:51am

raddevus

Updated 11-Nov-20 4:12am

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raddevus · Accepted Answer · 2020-11-11T04:13:00

Wow!! I think I may have figured it out.
Write a small script to print the cursor location while on that page.

JavaScript

function getMousePos(evt) {
  console.log("x : " + evt.clientX + "  y: " + evt.clientY); 
}
addEventListener("mousemove",getMousePos);

I just opened the console and then pasted that in and then began examining the x,y values.
Ha, but that wasn't the solution. I scrolled up in the page and saw the following error message given by FireFox:

FireFox Console

[-- This page uses the non standard property “zoom”. Consider using calc() in the relevant property values, or using “transform” along with “transform-origin: 0 0”. www.linkedin.com --]

I'm sure that is what is causing it. Finally! An answer. Technology can be so annoying.

I also confirmed that this problem does occur in Google Chrome also. And it also provides an error in the console:

Quote:
This page uses the non standard property “zoom”. Consider using calc() in the relevant property values, or using “transform” along with “transform-origin: 0 0”. recent-activity