The 9th edition of Web Development & Design Foundations with HTML5 introduces HTML5 and CSS3, web design, page layout, accessiblity, and web standards. Updates for the 9th edition include introductory sections on new CSS layout techniques -- CSS Flexible Box Layout (Flexbox) and CSS Grid Layout -- and expanded coverage of responsive web design, mobile web design best practices, viewport meta tag, CSS media queries, flexible images, testing mobile display, and CSS3 properties.