Quick Tip

CSS - when using more than one way to apply a style, be sure to understand style precedence. Inline styles will take precedence over embedded. Embedded will take precedence over external. For the most part, web sites are easier to work with and maintain when most if not all the styles are on an external style sheet in one place . . . then precedence is not an issue.

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HTML5: Why HTML5?

HTML5 is backwards compatible. XHTML 2 was not. This means any user agent (browser, mobile device, etc.) written to support HTML5 will also support documents written in earlier versions of HTML. This also means that the millions of older HTML documents that are currently online are still supported.
New semantic elements, such as the footer, section, and article tags, will give web pages additional structure and meaning.
HTML5 is less reliant on JavaScript and third party plug-ins. Much of the functionality is brought directly into the browser.
Parts of HTML5 specifications are supported now and, as a Web designer, you can implement those parts in your web sites today.