Cost per mille (CPM)

<div class="panel"><div class="label">SAME $100 BUDGET</div><div class="columns"><div><span>CPM</span><b id="cpm">$10</b></div><div class="arrow">→</div><div><span>IMPRESSIONS</span><b id="imps">10,000</b></div></div><div class="blocks" id="blocks"></div><div class="scale">LOW CPM <i></i> HIGH CPM</div></div>

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const blocks=document.querySelector('#blocks');blocks.innerHTML=Array.from({length:40},()=>'<i></i>').join('');let step=0;function draw(){const cpm=[5,10,20,25,20,10][step++%6],imps=100000/cpm;document.querySelector('#cpm').textContent='$'+cpm;document.querySelector('#imps').textContent=imps.toLocaleString();[...blocks.children].forEach((b,i)=>b.classList.toggle('on',i<Math.round(imps/500)))}draw();setInterval(draw,1200);