Custom Elements for Modern Browsers.
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X-Tag - Custom Elements for Modern Browsers

Based on the current W3 Web Components draft, X-Tag enables the custom element portion of the proposal. Custom elements let you register new tags/elements with the parser so they are recognized and inflated with special abilities you define.

Find out more about what X-Tag does, where it works, and how to use it, on the project page here:

X-Tag (excluding third-party icons or images) is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at


To get started hacking on X-Tag, first check out the code here:

git clone

If you're interested in exploring the tags we've already created, check out our x-tag-elements repository.

git clone --recursive

Create your own X-Tags

To get started making your own X-Tags visit

Share your tags by adding them to the offical X-Tag Registry.