Slow the turtle down

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This is an example, where the turtle speed is controlled by the setTimeout() method of JavaScript.

var brd = JXG.JSXGraph.initBoard('jxgbox',{boundingbox: [-250, 250, 250, -250]});
var t = brd.create('turtle',[100,-50],{strokeOpacity:0.7,fillColor:'#ff8800',fillOpacity:0.2});

function run(n) {
   if (n>0) {
     var st = 'run(' + (n-1) + ')';