Check for HTML5 support in browser

gistfile1.js

/**
 * Assume we want to check the placeholder HTML5 feature support in input element.
 * Credit should go to Daniel Stocks, I found this on his placeholder plugin
 * (https://github.com/danielstocks/jQuery-Placeholder/blob/master/jquery.placeholder.js#L71)
 */ 

var NATIVE_SUPPORT = !!("placeholder" in document.createElement( "input" ));

/**
 * Assume we want to check for HTML5 cavas support.
 * Found it on the stackoverflow. http://stackoverflow.com/a/2746983/502748 
 *
 */

function isCanvasSupported(){
  var elem = document.createElement('canvas');
  return !!(elem.getContext && elem.getContext('2d'));
}