# 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. --- # 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://structure.js.org/support.md?ask= ``` 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.