# Processors

Processors are community packages that enable stylelint to lint the CSS within non-stylesheet files. For example, you could lint the CSS within `<style>` tags in HTML, code blocks in Markdown, or strings in JavaScript.

*Processors can only be used with the CLI and the Node API, not with the PostCSS plugin.* (The PostCSS plugin will ignore them.)

-   [stylelint-processor-arbitrary-tags](https://github.com/mapbox/stylelint-processor-arbitrary-tags): Lint within user-specified tags.
-   [stylelint-processor-html](https://github.com/ccbikai/stylelint-processor-html): Lint within HTML `<style>` tags.
-   [stylelint-processor-markdown](https://github.com/mapbox/stylelint-processor-markdown): Lint within Markdown's [fenced code blocks](https://help.github.com/articles/creating-and-highlighting-code-blocks/).