X-Tag is a powerful sugar library primarily focused on wrapping and enhancing one of the draft-state Web Component specs: Custom Elements
With Custom Elements, you could for example just write up <x-map data-key="6c86bb5b30a442c180772d978f3ae000"></x-map> in your HTML and have it rendered as a full blown map.
Speed Up App Development with X-Tag and Web Components →
X-Tag – The Custom Elements Polylib →