As of core version 4.6 WP went from web fonts back to using system fonts:
As such, the font stack includes the following:
- -apple-system for Safari (iOS & macOS) and Firefox macOS
- BlinkMacSystemFont for Chrome macOS
- Segoe UI for Windows
- Roboto for Android and Chrome OS
- Oxygen-Sans for KDE
- Ubuntu for Ubuntu
- Cantarell for GNOME
- Helvetica Neue for versions of macOS prior to 10.11
- sans-serif, the standard fallback
https://make.wordpress.org/core/2016/07/07/native-fonts-in-4-6/
And exact technical expression/order in CSS as of right now is:
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;
So the actual font you are seeing is highly specific to the system you are looking at it on. You should just use the browser debug tools to check which specific font is being used in the case you are interested in.
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