Document Reference
Document is the entry point for page-level DOM operations. It creates elements and exposes information about the current document.
Where to run this
This example changes a document. Open it in the HTML playground, then select Run code. It runs inside a separate preview.
A practical example
<p id="info"></p>
<script>
document.getElementById("info").textContent = "Document language: " + document.documentElement.lang;
</script>
What happens
The paragraph displays the language on the root HTML element.