# 1.7	Technical note: web workers

A UDI runs as a web worker, in its own browser thread. It does not have access to the HTML of the chart or the browser DOM. You interact with the chart using the API described in this document and in the [example code.](https://sway-technologies.gitbook.io/sway-charts-pro-scripts-documentation/sway-charts-pro-user-defined-indicators/introduction/1.2-example-udi-code)

Because it's a web worker, your UDI can use Javascript's [importScripts()](https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Using_web_workers) to include external code libraries.


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