Something old, something new

The HTML5 markup language doesn’t replace or modify HTML 4 but adds to it. All valid markup elements in HTML 4 and XHTML are still valid in HTML5 (at least from the browser makers’ perspective). The difference is that HTML5 redefines some elements and adds new ones.┬áThe W3C outlines the differences in a useful document called “HTML5 differences from HTML4.”

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