Why icons are not displayed on some sites?

Question

Google

All elements (buttons, icons of social networks, etc.) are not displayed on the themeforest.net site , as well as on some other sites. Example prntscr.com/9ehzli
Chrome browser, updated, deleted, reinstalled ..

Answer 1

The font didn't load. Usually it can be because:
1. Some kind of proxy you do not let it through. Open dev. tools. See what he writes.
2. The CDN from which these fonts are downloaded is for some reason not available or blocked in your area.