@nazokiyoubinbou Yeah, this is an unethical tracking technique called fingerprinting
By combining together browser window size and a bunch of other browser attributes, it is sometimes possible to uniquely identify you
It is unethical, because it can be used in place of a cookie for tracking, even if the user has disabled or restricted cookie use
@eob @nazokiyoubinbou EFF has a fingerprint tool to test your browser's resistance. Link below.
It would be easy for browser makers to add things to block certain kinds of fingerprinting - like putting some random bits around webcanvas etc.
There no particular code of ethics that governs browser makers or website publishers - it would be better if this kind of tracking were unlawful.