<div id="container">
</div>

<script>
  // get container object
  let cnt = document.getElementById("container");

  // create counter
  let counter = 0;

  // create button element, set value and style
  let btn = document.createElement("button");
  btn.innerHTML = "Add 1";
  btn.style.display = "inline-block";
  btn.style.marginTop = "1em";
  btn.style.padding = "0.6em";

  // create label element, set value and style
  let lab = document.createElement("label");
  lab.innerHTML = counter;
  lab.style.display = "inline-block";
  lab.style.marginLeft = "1em";

  // create event handler
  function increaseCounter() {
    counter += 1;
    lab.innerHTML = counter;
  }

  // attach handler to button click event
  btn.addEventListener("click", increaseCounter);

  // append elements to container
  cnt.append(btn);
  cnt.append(lab);
</script>