Function makeRect

internal/driver/html/stacks.js:422–430

(cl, x, y, w, h)

    const src = stacks.Sources[srcIndex];

    function makeRect(cl, x, y, w, h) {
      const r = document.createElement('div');
      r.style.left = x+'px';
      r.style.top = y+'px';
      r.style.width = w+'px';
      r.style.height = h+'px';
      r.classList.add(cl);
      return r;
    }

    // Background
    const w = box.width - 1; // Leave 1px gap