SVG is an XML based standard for graphics. For more information see the W3C SVG specification.
A good starting point examples is Batik.

All demos use SVG via HTML5 and have been tested on Opera, Chrome, Firefox and Internet Explorer 11.
All demos should also work on a touch capable device.
Internet Explorer on Windows Phone 7.x doesn't seem to support SVG interactions (at least not as I've implemented them).

Demos

  1. Match
  2. Reverse
  3. Solitaire
  4. Latin Square
  5. Train Game
  6. Jigsaw Puzzle
  7. Save the world!