Remote-tracking branch

<div class="demo lanes"><div class="heading"><strong>REMOTE TRACKING</strong><span class="live">LIVE</span></div><div class="scene"><div class="diagram tracking">
      <div class="tracking-lane"><b>remote</b><span class="box cue " data-cue="0">A</span><span class="arrow" aria-hidden="true">→</span><span class="box cue " data-cue="1">B</span><span>server/main</span></div>
      <div class="tracking-lane"><b>local ref</b><span class="box cue " data-cue="0">A</span><span class="arrow" aria-hidden="true">→</span><span class="box cue " data-cue="2">B</span><span>origin/main</span></div>
      <div class="tracking-lane"><b>local work</b><span class="box cue " data-cue="0">A</span><span class="arrow" aria-hidden="true">→</span><span class="box cue " data-cue="3">B</span><span>main</span></div>
      <div class="tracking-note">fetch updates the tracking ref</div></div></div><div class="caption" id="caption"></div><div class="ticks"><i></i><i></i><i></i><i></i></div></div>

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const moments=[{"focus":0,"label":"All three refs initially point to A"},{"focus":1,"label":"Server branch advances to B"},{"focus":2,"label":"Fetch updates origin/main"},{"focus":3,"label":"Merge or rebase updates local main"}];let n=0;const cues=[...document.querySelectorAll('[data-cue]')],ticks=[...document.querySelectorAll('.ticks i')],caption=document.getElementById('caption'),dynamic=document.querySelector('.dynamic');function show(){const m=moments[n];cues.forEach(el=>el.classList.toggle('active',el.dataset.cue.split(',').includes(String(m.focus))));if(dynamic&&m.cells)dynamic.textContent=m.cells[m.cells.length-1];ticks.forEach((el,i)=>el.classList.toggle('active',i===n));caption.textContent=m.label;n=(n+1)%moments.length}show();let timer=setInterval(show,1050);document.querySelector('.demo').addEventListener('pointerdown',()=>{clearInterval(timer);show()})