He uses small background images that are places with CSS. Then, the classNames for the form elements are swithced with JavaScript. Marko also uses JavaScript to preloaded the custom images.

HTML and CSS form the basic coding languages for web ... Business apps built with web technologies, particularly HTML, CSS, and JavaScript, are in great demand since they can run natively on ...

I'm working on a web app with some dynamic forms, that show certain fields based on different form selection choices ... example on one of my forms of some HTML that would be hidden.