Seasonal.css, Design principles for the web - and more links today

Need help choosing a WordPress theme? Check these 12 options - A 2021 updated overview of solid top sellers and exciting newcomers. - BAWMedia  Sponsored

Seasonal.css - Seasonal colour scheme based on the day of the year. - James Stanley / filed under HTML & CSS

Design principles for the web - The opening presentation from An Event Apart Online Together. - Jeremy Keith / filed under Design Principles

Why we need mindful notifications and how to design them - Push notifications may be the most obvious form of interruptions because they pop up on or slide into… - Clo S / filed under UX Design

Validation is a mirage - Spend enough time talking with entrepreneurs, product people, designers, and anyone charged with proving something, and you’ll bump… - Jason Fried / filed under Product Management

HTML video sources should be responsive - Removing media support from HTML video was a mistake. - Scott Jehl / filed under HTML & CSS, Responsive Design