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Placehold.it - Quick and simple image placeholders

Custom text can be entered using a query string at the very end of the url. This is optional, default is the image dimensions (300×250). A-z (upper and lowercase), numbers, and most symbols will work just fine. http://placehold.it/
Taking advantage of the new capabilities of HTML5 and CSS3 can mean sacrificing control over the experience in older browsers. Modernizr 2 is your starting point for making the best websites and applications that work exactly right no matter what browser or device your visitors use. Thanks to the new Media Query tests and built-in YepNope.js micro-library as Modernizr.load() , you can now combine feature detection with media queries and conditional resource loading. That gives you the power and flexibility to optimize for every circumstance.

Modernizr

http://www.modernizr.com/
http://netrenderer.com/ IE NetRenderer allows you to check how a website is rendered by Internet Explorer 10 , 9 , 8 , 7 , 6 or 5.5 , as seen from a high speed datacenter located in Germany. Just type in a URL in the field above and try it out - it's free! Unlike other screenshot services , we are able to process a large number of capturing jobs in parallel and in realtime, making it the fastest service that we know of. Internet Explorer 10 Consumer Preview has been added. (still experimental)

IE NetRenderer - Browser Compatibility Check - www.vodeclic.com

http://grid.mindplay.dk/

Grid Designer 2

If you're familiar with the grid, a bit of design and basic typography, using this script should be pretty easy - most of the functions are pretty self-explanatory. The grid preview on the Columns tab will display the widths of each area, in pixels. Below it, the widths of spanning columns is displayed.