JavaScript만 사용하여 HTML 요소의 크기를 조정하려면 어떻게 해야 합니까?

var p = document.querySelector('p'); // Element to make resizable

p.addEventListener('click', function init() {
  p.removeEventListener('click', init, false);
  p.className = p.className + ' resizable';
  var resizer = document.createElement('div');
  resizer.className = 'resizer';
  p.appendChild(resizer);
  resizer.addEventListener('mousedown', initDrag, false);
}, false);

var startX, startY, startWidth, startHeight;

function initDrag(e) {
  startX = e.clientX;
  startY = e.clientY;
  startWidth = parseInt(window.getComputedStyle(p).width);
  startHeight = parseInt(window.getComputedStyle(p).height);
  document.addEventListener('mousemove', doDrag, false);
  document.addEventListener('mouseup', stopDrag, false);
}

function doDrag(e) {
  p.style.width = startWidth + e.clientX - startX + 'px';
  p.style.height = startHeight + e.clientY - startY + 'px';
}

function stopDrag(e) {
  document.removeEventListener('mousemove', doDrag, false);
  document.removeEventListener('mouseup', stopDrag, false);
}

<p>Resizable Text</p>