Sizes=”auto” pretty much requires width and height attributes — ericportis.com

Extending Responsive Video with HTML Web Components | Scott Jehl, Web Designer/Developer

Scott gives a thorough step-by-step walkthrough of building an HTML web component, in this case for responsive video:

In this post, I’m going to talk briefly about responsive video, but most of the post will be about using HTML web components to extend native video behavior in very helpful ways. But even if you’re not particularly interested in video development, stick around as I’ll demonstrate how to build an HTML Web Component to progressively enhance anything you need.

Learn Images

Mat has written this free course for you all about images on the web. Covering image formats, responsive images, and workflows, this is one to keep on speed dial.

Diana Ashktorab

This is my new favourite indie web site (super performant and responsive too).

Responsible Web Applications

An excellent collection of advice and examples for making websites responsive and accessibile (responsive + accessible = responsible).

The perfect responsive menu (2019) | Polypane responsive browser

I don’t know about “perfect” but this pretty much matches how I go about implementing responsive navigation (but only if there are too many links to show—visible navigation is almost always preferable).