I try to add shortcut to my Portfolio web by using code below:
link rel="icon" href="/favicon.ico" type="image/x-icon"
link rel="shortcut icon" href="/favicon.ico" type="image/x-icon"
However, it doesn't work. I don't why.
My website is http://wei-xia.github.io/
Try
<link rel="shortcut icon" href="/favicon.ico">