Redline web pages
Rooler is a utility for automatically measuring on-screen graphics.
Not quite like every other measurement utility out there (though there are quite a few)- this one analyzes the graphics and automatically finds the edges. It's essentially an automatic ruler, for the web.
- Measures the bounds of graphics
- Measures the distance between graphics
- Allows ensuring correct positioning of elements, even in deeply nested element hierarchies.
It's quick and easy. Give it a shot.
You can also try Rooler in your browser at http://peteblois.github.io/rooler.js.