The idea

DevTools is powerful, but overkill when all you want is a color and a font size. It hands you a 300-line computed-style dump and leaves you to dig. WhatTheCSS takes the opposite approach: it shows the authored CSS the values the developer actually wrote, in their original units and shorthand.

How it works

Activate the extension, and then hover over any element on any site. A clean tooltip surfaces the things that matter, like colors, typography, spacing, the box model, and pseudo-states like :hover and :focus, without the noise. It’s built to make inspecting and understanding CSS feel effortless and right inside the browser.

Status

WhatTheCSS is actively in development. More to share soon.