> For the complete documentation index, see [llms.txt](https://docs.tailent.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.tailent.com/actions/tap-actions/web/run-javascript.md).
# Run JavaScript
This action can be used to inject custom JavaScript code in a webpage.
## Properties
### Input
* **Identifier**: Indicate a new UI element, or select from the already defined list of selectors.
* **URL**: The URL link of the page containing the CSS selector.
* **JavaScript**: Field containing the JavaScript code to be injected into the page.
* **Statement**: Calling the JavaScript function containing the code to be injected.
### **Misc**
* **Display Name**: action display name in your implementation project.
* **Wait Before**: number milliseconds robot to wait before executing the action.
* **Wait After:** number milliseconds robot to wait until moving to the next action.
* **Abort on Error**: True/False.
* **Retry Times**: Specifies the number of times to retry an action if it doesn't end successfully. Default value 0 (no retry); Use -1 if you want to retry indefinitely.
## **Use Case**
### **Potential Use Cases**
* Checking for popups that may appear on screen and closing them.
* Filling in forms in web-pages.
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# Agent Instructions
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## 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, and the optional `goal` query parameter:
```
GET https://docs.tailent.com/actions/tap-actions/web/run-javascript.md?ask=&goal=
```
`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.
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.