HTML5 adds many new syntactical features. These include the < video >, < audio >, < header > and < canvas > elements, as well as the integration of SVG content that replaces the uses of generic < object > tags. These features are designed to make it easy to include and handle multimedia and graphical content on the web without having to resort to proprietary plugins and APIs. Other new elements, such as < section >, < article >, < header > and < nav > are designed to enrich the semantic content of documents. New attributes have been introduced for the same purpose, while some elements and attributes have been removed. Some elements, such as < a > , < cite > and < menu > have been changed, redefined or standardized. The APIs and document object model (DOM) are no longer afterthoughts, but are fundamental parts of the HTML5 specification. HTML5 also defines in some detail the required processing for invalid documents so that syntax errors will be treated uniformly by all conforming browsers and other user agents.
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