This webpage contains only links in the header for using ...

Google Font Tangerine

The following code is used in the <head> part:

<link rel="dns-prefetch" href="//fonts.googleapis.com">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Tangerine">

When you check this webpage with a broken link checker, it shouldn't find a broken link although a normal link to fonts.googleapis.com should result in a 404 error.