> For the complete documentation index, see [llms.txt](https://structure.js.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://structure.js.org/support.md).

# Support and compatibility

Structure is built on top of modern JavaScript, using new features like [Proxy](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Proxy), [Reflect](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Reflect) and [Symbol](https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Symbol). That being so, there are some things regarding compatibility you should consider when using Structure.

## Node

Node has only implemented all the used features at version 10, so to use Structure for a backend application you'll need Node 10 or later.

## Browser

We have a UMD version for usage in browsers. Right now the tests are ran both in Node (using the original code) and in Electron (using the UMD version) and the whole test suite passes for both cases. Since we use modern JavaScript features inside the lib (like [Proxy](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Proxy)), older browsers may not support it. Polyfilling them may be an option but it's not oficially supported.


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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://structure.js.org/support.md?ask=<question>&goal=<endgoal>
```

`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.

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