how to draw rotatable and resizable canvas rectangle using javascript

On rotations, please see: http://www.html5canvastutorials.com/advanced/html5-canvas-transform-rotate-tutorial[^].

Generally, this site seems to be a good resource: http://www.html5canvastutorials.com[^].

As many Mozilla tutorials, the one on Canvas also seems promising: https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/Canvas_tutorial[^].

Some more places to look at:
http://www.html5rocks.com/en/tutorials/canvas/notearsgame/[^],
http://code.tutsplus.com/series/canvas-from-scratch--net-19650[^].

You can find some more and look at several sources before you decide what to prefer.

—SA