HTML · Document structure

script

Loads or embeds JavaScript. Use defer for scripts that depend on the DOM and type="module" for modern module code.

htmlRunnable example html course

Syntax

<script src="app.js" defer></script>

Example

Try it

<div id="out">Waiting…</div>
<script>
  document.querySelector('#out').textContent = 'Script executed.';
</script>

Prefer defer over placing scripts at the end of body. Avoid inline scripts when a Content-Security-Policy is active.

Reference pages are the quick answer. The course explains the why, shows the full example and ends with a challenge.