Tumblr Uses Icon Font on Your Desktop Dashboard:
Have you zoomed in on your Tumblr Dashboard lately from the desktop browser? Noticed how crisp the post buttons and sidebar icons are? Tumblr switched its icon display to use a 64-character font.
On the downside, the font icons occasionally devolve into hollow boxes. But cursoring over the icons or a browser refresh snaps them back. Update — Note this helpful reply from shortformblog: “That box thing is an issue with the latest version of Chrome with all @font-face fonts. It’s fixed on the latest [Google Chrome] beta. I was actually surprised that it got out of the dev cycle.”