F=()=>{
c=v.getContext('2d')
c.lineWidth=.03
C=[1,-.5,-.5]
S=[0,.87,-.87]
P=[[X=200,Y=200],[X,Y],[X,Y]]
R=()=>{d=parseInt(Math.random()*3)
P=P.map(([x,y],i)=>(c.moveTo(x,y),c.lineTo(X=x+3*C[I=(d+i)%3],Y=y+3*S[I]),[X,Y]))
c.stroke()
setTimeout(R,17)
}
R()}
`<canvas width=400 height=400 id="v"></canvas><script>(${F.toString()})()</script>`