# Custom Browser Instructions

Custom Browser Instructions is a free feature of [**Web Unblocker**](/products/web-unblocker.md). It's used with a headless web browser that can load and render web pages, execute [**JavaScript**](/products/web-unblocker/custom-browser-instructions/javascript-rendering.md), manipulate the DOM (Document Object Model) just like a regular browser, allowing to execute various [**browser instructions**](/products/web-unblocker/custom-browser-instructions/browser-instructions-beta.md) such as clicking, scrolling, inputting, waiting and more. Read more:

{% content-ref url="/pages/ya88snyMPhkJB6RHRj63" %}
[JavaScript rendering](/products/web-unblocker/custom-browser-instructions/javascript-rendering.md)
{% endcontent-ref %}

{% content-ref url="/pages/MLUII8RvgIcxSEwhnvCw" %}
[Browser instructions (Beta)](/products/web-unblocker/custom-browser-instructions/browser-instructions-beta.md)
{% endcontent-ref %}


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://developers.oxylabs.io/products/web-unblocker/custom-browser-instructions.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.