HTC One E8 - Manual (Page 98)

Only the browsing history stored by the Internet app is deleted. Browsing history
stored by other browsers on HTC One (E8) will remain unaffected.
Private browsing
You can use incognito tabs to browse the Web with more privacy. Browser cookies
are deleted and not shared when you close all incognito tabs. Pages you view in
incognito also won't appear in your browser history (except for files you've
downloaded).
From the browser screen, tap > .
98 Search and web browser