What is a ClientRects?

The getClientRects method shows the distances in pixels to a specific element from the top-left corner of the page. Depending on other parameters such as screen resolution, fonts, etc. makes this value unique for each computer, and accordingly, having received this value, you can be identified by it in the future. There is no substitute for this fingerprint, but it is also affected by changes in browser scale, even by 1 unit.