Which Everyday Tech Problem Annoys You the Most?

Iframe responsiveness without introducing more libraries or things that need to send sizing info back to the iframe.

Definitely iframe responsiveness without bloated frameworks. Have you tried the seamless.js library? It handles the cross-domain messaging for you to make iframes adapt to their content. Super lightweight, no dependencies. Although sometimes good old fashioned media queries still get the job done without any extra JS overhead if your layout is simple enough.