For some reason CanIUse only covers SVG favicons if linked in as an external file (as the bottom code sample on the original site does): https://caniuse.com/li

For some reason CanIUse only covers SVG favicons if linked in as an external file (as the bottom code sample on the original site does): https://caniuse.com/link-icon-svg https://caniuse.com/link-icon-svg Supported by Edge, Firefox, Chrome, and Opera. Safari and iOS in a rather limited way, but you're still looking at about 70% of users with SVG icons alone. Not so sure how to look up if they're supported directly in the link element. I just tested the "emoji" version on Chrome and it rendered some total junk as the icon, so I'm not sure about support for that either.