modernizr/feature-detects/canvas.js

Modernizr is a JavaScript library that detects HTML5 and CSS3 features in the user’s browser.

/*!
{
  "name": "Canvas",
  "property": "canvas",
  "caniuse": "canvas",
  "tags": ["canvas", "graphics"],
  "polyfills": ["flashcanvas", "excanvas", "slcanvas", "fxcanvas"]
}
!*/
/* DOC
Detects support for the `<canvas>` element for 2D drawing.
*/
define(['Modernizr', 'createElement'], function(Modernizr, createElement) {
  // On the S60 and BB Storm, getContext exists, but always returns undefined
  // so we actually have to call getContext() to verify
  // github.com/Modernizr/Modernizr/issues/issue/97/
  Modernizr.addTest('canvas', function() {
    var elem = createElement('canvas');
    return !!(elem.getContext && elem.getContext('2d'));
  });
});