javascript - requestAnimationFrame polyfill: what's the element parameter for? -

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i using requestanimationframe polyfill erik möller (fixes paul irish , tino zijdel) , wondering second parameter called "element" for.

here code:

(function() {     var lasttime = 0;     var vendors = ['ms', 'moz', 'webkit', 'o'];     for(var x = 0; x < vendors.length && !window.requestanimationframe; ++x) {         window.requestanimationframe = window[vendors[x]+'requestanimationframe'];         window.cancelanimationframe = window[vendors[x]+'cancelanimationframe']                                    || window[vendors[x]+'cancelrequestanimationframe'];     }      if (!window.requestanimationframe)         window.requestanimationframe = function(callback, element) {             var currtime = new date().gettime();             var timetocall = math.max(0, 16 - (currtime - lasttime));             var id = window.settimeout(function() { callback(currtime + timetocall); },               timetocall);             lasttime = currtime + timetocall;             return id;         };      if (!window.cancelanimationframe)         window.cancelanimationframe = function(id) {             cleartimeout(id);         }; }());

so question line:

window.requestanimationframe = function(callback, element) {

what "element" do?

thank in advance,

joan

according w3c draft, no element parameter passed function. @ least now.

as can see, there an issue suggest addition of such parameter. issue considered not necessary first version of spec. , has been closed.

i think can ignore parameter.


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