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# markdown-it-sub [](https://travis-ci.org/markdown-it/markdown-it-sub) [](https://www.npmjs.org/package/markdown-it-sub) [](https://coveralls.io/r/markdown-it/markdown-it-sub?branch=master) > Subscript (`<sub>`) tag plugin for [markdown-it](https://github.com/markdown-it/markdown-it) markdown parser. __v1.+ requires `markdown-it` v4.+, see changelog.__ `H~2~0` => `H<sub>2</sub>O` Markup is based on [pandoc](http://johnmacfarlane.net/pandoc/README.html#superscripts-and-subscripts) definition. But nested markup is currently not supported. ## Install node.js, browser: ```bash npm install markdown-it-sub --save bower install markdown-it-sub --save ``` ## Use ```js var md = require('markdown-it')() .use(require('markdown-it-sub')); md.render('H~2~0') // => '<p>H<sub>2</sub>O</p>' ``` _Differences in browser._ If you load script directly into the page, without package system, module will add itself globally as `window.markdownitSub`. ## License [MIT](https://github.com/markdown-it/markdown-it-sub/blob/master/LICENSE)