HTMLScriptElement: noModule property

The noModule property of the HTMLScriptElement interface is a boolean value that indicates whether the script should be executed in browsers that support ES modules. Practically, this can be used to serve fallback scripts to older browsers that do not support JavaScript modules.

It reflects the nomodule attribute of the <script> element.

<script id="el" nomodule>
  // If the browser supports JavaScript modules, the following script will not be executed.
  console.log("The browser does not support JavaScript modules");
</script>

const el = document.getElementById("el");
console.log(el.noModule); // Output: true