On: Pylon – Declarative layout primitives for CSS and HTML

[erichurkman]

Reminds me very much of XUL, Mozilla's XML-based language for UI. https://developer.mozilla.org/en-US/docs/Mozilla/Tech/XUL

In a prior life I developed a slew of XUL apps, including a full-suite medical record system and billing system. It had its quirks, but for a developer-heavy (and design-light) firm it was a great way to build standard, predictable, and accessible UIs.