How to Favicon in 2026: Three files that fit most needs—Martian Chronicles, Evil Martians’ team blog
For the browser using HTML:
<link rel="icon" href="/favicon.ico" sizes="32x32">
<link rel="icon" href="/icon.svg" type="image/svg+xml">
<link rel="apple-touch-icon" href="/apple-touch-icon.png"><!-- 180×180 -->