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.
http://mozilla.github.com/x-tag/
JavaScript Libraries and Functions
Get access to data on 2,730 websites X-Tag Customers. We know of 1,779 live websites using X-Tag and an additional 951 sites that used X-Tag historically and 756 websites in the United States.
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Get a list of 2,730 websites using X-Tag which includes location information, hosting data, contact details, 1,779 currently live websites and an additional 4,587 domains that redirect to sites in this list. 951 sites that used this technology previouslyand 756 websites in the United States currently using X-Tag.
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