title: Are there any HTML5/Canvas windowing system libraries (ala Qt, WxWidgets, etc)?
body: <p>With the beginning of widespread HTML5 support and Canvas support, it seems that someone could create a desktop-esque windowing system library for RIAs.  Something similar to Qt or WxWidgets.  All the required parts seem to be there (runtime language: javascript, pixel drawing: canvas, even vector drawing with SVGs).</p>
  
  <p>This seems to me anyway that it could be a huge leap for the ease of development of RIAs.  Forget about classic HTML and styling, and simply create widgets like you would in a desktop application.  </p>
  
  <p>I have been searching around on the web for quite a while though and can't find anything that jumps out at me as fitting this description.  Am I missing something or is there just nothing like this out there yet?</p>