Reciprocal rank fusion

<div class="v"><header><b>RANK FUSION</b><span id="state"></span></header><main><div class="ranks" id="ranks"></div><div class="winner" id="winner"></div></main><footer>score = Σ 1 / (k + rank)</footer></div>

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let n=0;function draw(){document.getElementById("ranks").innerHTML="<div class=rank>KEYWORD<b>A</b><b>B</b><b>C</b></div><div class=rank>VECTOR<b>B</b><b>A</b><b>D</b></div>";document.querySelectorAll(".rank b").forEach((el,i)=>el.classList.toggle("active",n===0?[0,4].includes(i):n===1?[1,3].includes(i):[0,1,3,4].includes(i)));document.getElementById("winner").textContent=["A: rank 1 + rank 2","B: rank 2 + rank 1","B and A lead both lists"][n];document.getElementById("state").textContent=["score A","score B","fuse ranks"][n];n=(n+1)%3}draw();setInterval(draw,1100)