Function rect

browsertests/testdata/testflame.js:26–33

(t)

  // rect gets the bounding box for box with text t.
  function rect(t) {
    const elem = boxMap.get(t);
    if (!elem) {
      test.err("did not find", t);
      return null;
    }
    return elem.getBoundingClientRect();
  }

  // checkCalls checks that box with text a is positioned w.r.t. box with
  // text b to indicate a call from a to b.  Expect a gap of the specified