The onFontLoad plugin detects when the fonts linked with
font-face are loaded and ready to use. It's a very lightweight
(1Kb gzipped) solution to Flash of Unstyled Text (FOUT).
Usage instructions available on GitHub.
This page will only displays after the main font is loaded. A sample text will be appended to the next three fonts below when they're ready.
You might need to disable browser cache or setup a network throttling to see Loading phase.