Share JSXGraph: example "Ellipse: pin and string method"

JSXGraph
Share JSXGraph: example "Ellipse: pin and string method"
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Ellipse: pin and string method

Web references:
// Define the id of your board in BOARDID

JXG.Options.label.autoPosition = true;
JXG.Options.text.fontSize = 16;
JXG.Options.line.strokeWidth = 0.8;

const board = JXG.JSXGraph.initBoard(BOARDID, {
    boundingbox: [-5, 5, 5, -5], 
    axis: true
});

var f1 = board.create('glider', [-2, 0, board.defaultAxes.x], {name:"f'"});
var f2 = board.create('glider', [2,  0, board.defaultAxes.x], {name:"f"});
var ell = board.create('ellipse', [f1, f2, [0,3]]);

var P = board.create('glider', [-1, 2, ell], {name: 'p'}); 
var s1 = board.create('segment', [f1,P]);
var s2 = board.create('segment', [f2,P]);

var txt = board.create('text', [0.2, 4, 
    () => "|pf| + |pf'| = " + P.Dist(f1).toFixed(2) + ' + ' +  P.Dist(f2).toFixed(2) + ' = ' + (P.Dist(f1) + P.Dist(f2)).toFixed(2)
]);