Audience question: when pure front-end (HTML/CSS/JS) developers encounter a UI written in Ruby with Phlex, how do they react? Seth Horsley answers that Ruby is so easy that onboarding 'just worked' — and with Phlex in particular, if they forget to close an HTML tag the error message is clear and actionable. Joel Drapper adds that an upcoming Phlex validator will ship literal schemas for every HTML attribute, so using 'true' when you should have used 'yes', or a malformed date in a time element, will be reported with an explanation and a link to the MDN documentation for that attribute.