Why doesn't "webgl" context work on Chrome? -

this piece of code returns null on chrome returns proper context on firefox.

var create3dcontext = function(canvas, opt_attribs) {   var names = ["webgl", "experimental-webgl"];   var context = null;   (var ii = 0; ii < names.length; ++ii) {     try {       context = canvas.getcontext(names[ii], opt_attribs);     } catch(e) {}     if (context) {       break;     }   }   return context; } 

this how called:

var setupwebgl = function(canvas, opt_attribs) {   function showlink(str) {     var container = canvas.parentnode;     if (container) {       container.innerhtml = makefailhtml(str);     }   };    if (!window.webglrenderingcontext) {     showlink(get_a_webgl_browser);     return null;   }    var context = create3dcontext(canvas, opt_attribs);   if (!context) {     showlink(other_problem);   }   return context; };  var getwebglcontext = function(canvas, opt_attribs) {   if (isiniframe()) {     updatecssifiniframe();      // make canvas backing store size it's displayed.     canvas.width = canvas.clientwidth;     canvas.height = canvas.clientheight;   } else {     var title = document.title;     var h1 = document.createelement("h1");     h1.innertext = title;     document.body.insertbefore(h1, document.body.children[0]);   }    var gl = setupwebgl(canvas, opt_attribs);   return gl; };  var isiniframe = function() {   return window != window.top; };   getwebglcontext(document.getelementbyid("canvas"));