HTMLElement: autocapitalize property

<div>Current capitalization behavior is: <span id="ac-label"></span></div>
<div id="ac-element" contenteditable="true" autocapitalize="default">
  input here
</div>
<select id="ac-controller" type="checkbox" checked>
  <option value="default">default</option>
  <option value="none">none</option>
  <option value="sentences">sentences</option>
  <option value="words">words</option>
  <option value="characters">characters</option></select
>Select the capitalization behavior

const label = document.getElementById("ac-label");
const element = document.getElementById("ac-element");
const controller = document.getElementById("ac-controller");

controller.addEventListener("input", (e) => {
  const behavior = e.target.value;
  label.textContent = behavior;
  element.autocapitalize = behavior;
});