JSFiddle - React, Tailwind, and code Playground

HTML

<div class="test" id="test" placeholder="Type something..." contenteditable="true"></div>

CSS

.test {
    width: 500px;
    height: 70px;
    background: #f5f5f5;
    border: 1px solid #ddd;
    padding: 5px;
}

.test[placeholder]:empty:before {
    content: attr(placeholder);
    color: #555; 
}

JavaScript

var target = document.querySelector('#test');
var observer = new MutationObserver(function(mutations) {
  mutations.forEach(function(mutation) {
      if (target.textContent == '') {
          target.innerHTML = '';
      }
  });    
});
var config = { attributes: true, childList: true, characterData: true };
observer.observe(target, config);