This gist lists the online references I used to build my workshop "Bridging The Gap — Produce and Communicate Design Decisions to Developers".
Slides can be found here: https://speakerdeck.com/rayana/bridging-the-gap-produce-and-communicate-design-decisions-to-developers
What Does My Site Cost? Find out how much it costs for someone to use your site on mobile networks around the world. https://whatdoesmysitecost.com
HTML Basics - Mozilla docs