[saidajigumi]

Well that's interesting. This may shed light on some of the seemingly conflicting results. On Mac OS X 10.10.1, Chrome 41.0.2264.2 (Canary):

Steps:

1. Open browser, open [1] in new tab. Get code X.

2. Open [1] in new incognito window. Get code Y.

3. Reload that incognito window. Get code Y.

4. Close incognito window.

5. Open [1] in second new incognito window. Get code X.

Subsequent iterations of opening/closing regular and incognito windows and/or restarting Chrome all yielded code X.

[1] http://www.radicalresearch.co.uk/lab/hstssupercookies/

[andreyf]

Perhaps you started (2) before (1) finished?