When you go to a website you may see a font that looks interesting and sparks some curiosity as to what font type was used. There are all kinds of web developer tools that make finding this info pretty easy, but all you really need is the WhatFont bookmarklet. When you run the bookmarklet you’ll be able to click on any of the text on the page you’re viewing to see more details about it.
As you can see in the screenshot above WhatFont tells you the font family and size, line height, color, and an example of the upper/lower case alphabet using that particular font. Plus it is all wrapped up in a beautiful popup window.
If you’re not a fan of bookmarklets there is also a Chrome extension available, but I prefer the bookmarklet since it works in all the major browsers without having to worry about installing yet another extension.