Each and every web browsers gives you the ability, as a web developer, to work faster with extensions and/or built-in features.
A good extension to add to Chrome is pendule, it works like a charm with the Chrome tool developer. This extension will add good features:
- Pick up a color onto the page
- Get the topology of your page so you can see how your divs/elements are displayed
- Automatically validate your pages (W3C validation, browsers compatibilities)
The Chrome tool developer is a very nice tool but pendule fills in some missing features (that I found mandatory).