Comparative query

<div class="d2 compare"><div class="eyebrow">COMPARE · COST ↔ BRIGHTNESS</div><div class="question">Which lamp fits a small desk?</div><div class="cards"><div class="box"><b>ARC</b><small>Low cost · softer beam</small><div class="bar"><i id="arcBar"></i></div><strong id="arcScore">68</strong></div><div class="box"><b>BEAM</b><small>Higher cost · brighter</small><div class="bar"><i id="beamBar"></i></div><strong id="beamScore">52</strong></div></div><label>PRIORITY <input id="priority" type="range" min="0" max="100" value="20"> <span id="priorityText">COST</span></label></div>

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const slider=document.querySelector('#priority'),a=document.querySelector('#arcScore'),b=document.querySelector('#beamScore'),ab=document.querySelector('#arcBar'),bb=document.querySelector('#beamBar'),label=document.querySelector('#priorityText');let timer;function update(){const p=Number(slider.value),as=Math.round(74-p*.3),bs=Math.round(42+p*.46);a.textContent=as;b.textContent=bs;ab.style.width=as+'%';bb.style.width=bs+'%';label.textContent=p<50?'COST':'BRIGHTNESS'}slider.addEventListener('input',()=>{clearInterval(timer);update()});let step=0;timer=setInterval(()=>{slider.value=step++%2?20:80;update()},2500);update();