> For the complete documentation index, see [llms.txt](https://javascriptuse.gitbook.io/javascript/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://javascriptuse.gitbook.io/javascript/mot-vi-du-ve-cach-su-dung-async-tren-w3school.md).
# Sử dụng async và defer full (Oke)
```
Hello World!
Note: The async attribute of the script tag is not supported in Internet Explorer 9 and earlier versions.
```
```
// demo_async.js
alert(document.getElementById("p1").firstChild.nodeValue);
```
{% file src="/files/-Lx5RTnQWpnNu\_tG8ufe" %}
---
# Agent Instructions
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## Querying This Documentation
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Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://javascriptuse.gitbook.io/javascript/mot-vi-du-ve-cach-su-dung-async-tren-w3school.md?ask=
```
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The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.