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n-gons - Slow version
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<iframe 
    src="http://jsxgraph.uni-bayreuth.de/share/iframe/n-gones-slow-version" 
    style="border: 1px solid black; overflow: hidden; width: 550px; aspect-ratio: 55 / 65;" 
    name="JSXGraph example: n-gons - Slow version" 
    allowfullscreen
></iframe>
This code has to 
<textarea id="inputtext" rows=3 cols=35 wrap="off" style="width:600px;">
speed=25;
t.cs().hideTurtle().setProperty({strokeWidth:4,strokeOpacity:0.6,fillOpacity:0.3});
ngon(10,60);
</textarea>

<input type="button" value="run" onClick="run()">
<input type="button" value="clear" onClick="clearturtle()">

<div id="board-0-wrapper" class="jxgbox-wrapper " style="width: 100%; ">
   <div id="board-0" class="jxgbox" style="aspect-ratio: 1 / 1; width: 100%;" data-ar="1 / 1"></div>
</div>

<script type = "text/javascript"> 
    /*
    This example is licensed under a 
    Creative Commons Attribution ShareAlike 4.0 International License.
    https://creativecommons.org/licenses/by-sa/4.0/
    
    Please note you have to mention 
    The Center of Mobile Learning with Digital Technology
    in the credits.
    */
    
    const BOARDID = 'board-0';

    var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-300, 300, 300, -300], keepaspectratio: true });
    
    var t = board.create('turtle', [], { fillColor: 'yellow', highlight: false });
    var speed;
    
    var innerloop = function(i, j, ne, sz) {
        if (i > 0) {
            if (j == ne) { t.rt(360 / ne); }
            t.rt(360 / ne);
            t.fd(sz);
            j--;
            if (j <= 0) {
                j = ne;
                i--;
            }
            setTimeout(function() { innerloop(i, j, ne, sz); }, speed);
        }
    }
    
    function ngon(ne, sz) {
        innerloop(ne, ne, ne, sz);
    }
    
    function run() {
        var code = document.getElementById('inputtext').value;
        if (code == '') { return; }
        eval(code);
    }
    
    function clearturtle() {
        t.cs();
    }
 </script> 
/*
This example is licensed under a 
Creative Commons Attribution ShareAlike 4.0 International License.
https://creativecommons.org/licenses/by-sa/4.0/

Please note you have to mention 
The Center of Mobile Learning with Digital Technology
in the credits.
*/

const BOARDID = 'your_div_id'; // Insert your id here!

var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-300, 300, 300, -300], keepaspectratio: true });

var t = board.create('turtle', [], { fillColor: 'yellow', highlight: false });
var speed;

var innerloop = function(i, j, ne, sz) {
    if (i > 0) {
        if (j == ne) { t.rt(360 / ne); }
        t.rt(360 / ne);
        t.fd(sz);
        j--;
        if (j <= 0) {
            j = ne;
            i--;
        }
        setTimeout(function() { innerloop(i, j, ne, sz); }, speed);
    }
}

function ngon(ne, sz) {
    innerloop(ne, ne, ne, sz);
}

function run() {
    var code = document.getElementById('inputtext').value;
    if (code == '') { return; }
    eval(code);
}

function clearturtle() {
    t.cs();
}
This interactive turtle graphics demo allows users to draw regular polygons by editing the JavaScript code in the text area. The drawing speed (default 25) as well as the $n$ (default 10), the number of $n$-gons, and their size (in pixel, default 60) can be adjusted.
<textarea id="inputtext" rows=3 cols=35 wrap="off" style="width:600px;">
speed=25;
t.cs().hideTurtle().setProperty({strokeWidth:4,strokeOpacity:0.6,fillOpacity:0.3});
ngon(10,60);
</textarea>

<input type="button" value="run" onClick="run()">
<input type="button" value="clear" onClick="clearturtle()">
// Define the id of your board in BOARDID

var board = JXG.JSXGraph.initBoard(BOARDID, { boundingbox: [-300, 300, 300, -300], keepaspectratio: true });

var t = board.create('turtle', [], { fillColor: 'yellow', highlight: false });
var speed;

var innerloop = function(i, j, ne, sz) {
    if (i > 0) {
        if (j == ne) { t.rt(360 / ne); }
        t.rt(360 / ne);
        t.fd(sz);
        j--;
        if (j <= 0) {
            j = ne;
            i--;
        }
        setTimeout(function() { innerloop(i, j, ne, sz); }, speed);
    }
}

function ngon(ne, sz) {
    innerloop(ne, ne, ne, sz);
}

function run() {
    var code = document.getElementById('inputtext').value;
    if (code == '') { return; }
    eval(code);
}

function clearturtle() {
    t.cs();
}

license

This example is licensed under a Creative Commons Attribution ShareAlike 4.0 International License.
Please note you have to mention The Center of Mobile Learning with Digital Technology in the credits.