Measurement triangulation

<div class="tri"><div class="head">ONE CHANNEL · THREE LENSES <b id="spread">SPREAD: WIDE</b></div><div class="scale"><div class="band" id="band"></div><div class="mark" id="m1"><span>ATTRIBUTION</span><i></i></div><div class="mark" id="m2"><span>MMM</span><i></i></div><div class="mark" id="m3"><span>LIFT TEST</span><i></i></div></div><div class="base"><span>LOW EFFECT</span><span>HIGH EFFECT</span></div></div>

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let aligned=false;function draw(){const xs=aligned?[46,52,56]:[20,50,80];['m1','m2','m3'].forEach((id,i)=>document.querySelector('#'+id).style.left=xs[i]+'%');document.querySelector('#band').style.left=xs[0]+'%';document.querySelector('#band').style.width=(xs[2]-xs[0])+'%';document.querySelector('#spread').textContent=aligned?'SPREAD: NARROW':'SPREAD: WIDE'}draw();setInterval(()=>{aligned=!aligned;draw()},1750);