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h5o is an implementation of the HTML5 outline algorithm.

In your browser

Chrome extension
- Install from Chrome Store
- Install a standalone crx (note that while the signing key for the crx is encrypted, the password is "known" to Travis)
- Source code
Bookmarklet: https://h5o.github.io/bookmarklet.html
<iframe style="border:1px solid #e8e8e8;border-radius: 3px;background-color: #eef;" width="100%" height="80" src="/bookmarklet.html" frameborder="0"></iframe>
- Installation details for common browsers.
- Internet Explorer not supported.
- Source code

Javascript library

var HTML5Outline = require("h5o");
var outline = HTML5Outline(document.body);
console.log(outline.asHTML());