There was a time when the smart move in picking fonts for a website was to a font-family that was supported across as many platforms as possible.
font-family: Tahoma; and whatnot. Or even better, a font stack that would fall back to as-similar-as possible stuff, like
font-family: Tahoma, Verdana, Segoe, sans-serif;.
These days, an astonishing number of sites are using custom fonts. 60%!
No surprise, there is also a decent amount of pushback on custom fonts. They need to be downloaded, thus there are performance/bandwidth hits. There is loads of nuance on how you load them.
Also no surprise, there is some advocacy for the return to local fonts. Fast! Good enough! Let's look at that for a sec, then also look at using them within SVG.