I usually message support anyhow. Icon fonts helped webdevs support Internet Explorer with *.eot but after IE finally got SVG support, there was no reason to continue with icon fonts. The biggest general offenders are Font Awesome users (even when they offer SVG sprites) & Material Icons—with the latter being particularly broken with the icon name in plaintext (like this site) making it impossible to read versus just a broken Unicode tofu you’d expect. If the developer did the right thing & added title attributes, at least when you have a cursor you can see the name of the action.