Learn to Code HTML & CSS
A Guide to HTML & CSS Forms (No Hacks!) - SitePoint
Daniel Schwarz shows how to mark up forms using only HTML and CSS, covering new CSS3 options that make it easier to style inputs.
Learning Web Design, 5e
Article Update: Don’t Rely on Default `sizes`
The responsive images spec has changed. Eric Portis updates us on what's new since “Responsive Image...