fingerprinting
What a website learns before you click anything
I followed one link to a test site and touched nothing. The site got 15 lines about me with the request and read 33 more things in under half a second.
What incognito mode actually hides, and from whom
I opened one site in a normal Chrome window and an incognito one and compared what it saw. 26 of 29 things matched. Here is what incognito changes.