- Is it really a
.ico, or is it just named “.ico”? - What browser are you testing in?
The absolutely easiest way to have a favicon is to place an icon called “favicon.ico” in the root folder. That just works everywhere, no code needed at all.
If you must have it in a subdirectory, use:
<link rel="shortcut icon" href="https://stackoverflow.com/img/favicon.ico" />
Note the / before img to ensure it is anchored to the root folder.