#2 HTML5 / CSS

HTML5 is a markup language for structuring and presenting content for the World Wide Web and is the core technology of the Internet. It is the fifth revision of the HTML standard (created in 1990 and standardized as HTML 4 as of 1997) and, as of December 2012, is a W3C Candidate Recommendation.

Cascading Style Sheets (CSS) is a style sheet language used for describing the presentation semantics (the look and formatting) of a document written in a markup language. It’s most common application is to style web pages written in HTML and XHTML, but the language can also be applied to any kind of XML document, including plain XML, SVG and XUL.

This simple markup language is literally what the Web is made of, with cascading style sheets (CSS) making everything look nice and JavaScript adding interactive functionality.

In fact, as tablets, Smartphones and cloud-hosted services proliferate, the importance of the Web grows along with it. Consumers still need to access their cloud-hosted SaaS services via their Web browser. And studies show that tablet owners still love the Web.

After years of relative stagnation, HTML has made big advancements in recent years with HTML5, which is now supported by the latest versions of all major Web browsers. Meanwhile, the design options available via CSS3 and the interactivity provided by JavaScript have pushed the Web even further, blurring the line between Web-based and native apps.

Elance and Indeed both rank HTML as one of their most sought-after job skills, while other studies routinely point to it being in strong demand.

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