One-click ad experiments

<div class="experiment"><div class="label">CAMPAIGN EXPERIMENT <span>50 / 50 SPLIT</span></div><div class="arms"><div>BASELINE <b id="base">12</b><i id="basebar"></i></div><div>AI MAX TEST <b id="test">13</b><i id="testbar"></i></div></div><div class="chart"><svg viewBox="0 0 300 55" preserveAspectRatio="none" aria-label="Illustrative comparison chart"><polyline id="line-a" fill="none" stroke="var(--fg)" stroke-width="3" points="0,45 75,35 150,29 225,24 300,18"/><polyline id="line-b" fill="none" stroke="var(--accent)" stroke-width="3" points="0,45 75,37 150,31 225,23 300,15"/></svg></div><div class="caption" id="caption">COMPARE AFTER THE TEST WINDOW</div></div>

.experiment{width:min(88%,500px);font:800 clamp(10px,max(2vmin,1vw),16px)/1.2 sans-serif}.label{display:flex;justify-content:space-between;gap:7px;border-bottom:2px solid var(--fg);padding-bottom:6px}.label span{color:var(--accent)}.arms{display:grid;grid-template-columns:1fr 1fr;gap:clamp(6px,2vmin,15px);margin-top:clamp(8px,2vmin,15px)}.arms div{border:1px solid var(--line);background:var(--surface);padding:clamp(7px,2vmin,16px)}.arms b{display:block;font-size:clamp(17px,4.5vmin,32px);margin:3px 0}.arms i{display:block;height:clamp(6px,1.3vmin,10px);width:50%;background:var(--fg);transition:width .45s}.arms div:last-child i{background:var(--accent)}.chart{height:clamp(38px,10vmin,75px);border-bottom:1px solid var(--line);margin-top:clamp(8px,2vmin,14px)}svg{display:block;width:100%;height:100%}.caption{margin-top:6px;color:var(--accent)}

const states=[[12,13,'EARLY READ — KEEP RUNNING'],[18,17,'MID TEST — KEEP RUNNING'],[24,27,'COMPARE AFTER THE TEST WINDOW']];let n=0;function draw(){const [a,b,label]=states[n++%3];document.getElementById('base').textContent=String(a);document.getElementById('test').textContent=String(b);document.getElementById('basebar').style.width=(a*3)+'%';document.getElementById('testbar').style.width=(b*3)+'%';document.getElementById('caption').textContent=label;document.getElementById('line-a').setAttribute('points','0,45 75,35 150,29 225,24 300,'+(55-a));document.getElementById('line-b').setAttribute('points','0,45 75,37 150,31 225,23 300,'+(55-b))}draw();setInterval(draw,1500);