Want to use a <blink> tag with today's browsers? Just add <link rel="stylesheet" type="text/css" href="https://quaxio.com/blink.css"/> to your page. This is a (neat and) pure CSS solution, with no JavaScript.
<link rel="stylesheet" type="text/css" href="https://quaxio.com/blink.css"/>
Example: Why would anybody do this?