Cascading binding sheets. Reactive UI without the complexity of SPA frameworks. Use any backend you like; bind to the HTML you already produced.

Flat, simple, multi-themed, responsive and hackable Color-Picker library. No dependencies, no jQuery. Compatible with all CSS Frameworks e.g. Bootstrap, Materialize. Supports alpha channel, rgba, hsla, hsva and more!

HTML Reference.io is a free guide to HTML. It features all elements and attributes.