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I'm doing UX testing. Wondering is there any way (think of application or javascripts) that I can run on a page and check what the font size of a-tags, p-tags, etc

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up vote 7 down vote accepted


Tools-> Web Developer -> inspect


Tools -> F12 developers tools.

IE developer tool works pretty well in my opinion.

enter image description here

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Thank you for a quick reply – Jackie Chan Mar 19 '12 at 0:05
Chrome: Wrench icon -> Tools -> Developer Tools. Or Ctrl+Shft+I – Marjan Venema Mar 19 '12 at 7:27
Firebug is an extension for Firefox which works in a similar way. You can trace styles and change both CSS-rules and actual html-markup without making changes to your document. – dotmartin Mar 19 '12 at 10:42
@MarjanVenema F12 also works in Chrome as an alias to ctrl+shift+I – Pierre-Alain Vigeant Mar 19 '12 at 17:15
Also in Chrome: Right click -> Inspect Element – DangerZone May 17 at 17:52

If you want to test the css automatically, you can use Selenium: A short article about css testing with Selenium can be found here:

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Hi Frank welcome to UX.SE! The question was about finding out what is displayed not testing it against desired specs. – dnbrv Mar 20 '12 at 12:21

Also there is a great tool called WhatFont: You can check which font used on the page, it's size and line height.

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Developer tools built-into browsers are more efficient than third-party websites. – dnbrv Mar 19 '12 at 16:58
Right, but I can figure out which font used on the page using WhatFont with less efforts over Safari developer tool. – Artiom Dashisnky Mar 20 '12 at 11:40

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