A deprecated element or attribute is one that has been outdated by newer constructs. Deprecated elements may become obsolete in future versions of HTML.
It is important to avoid deprecated elements so that your Web page is compliant with current browser technology. Using deprecated elements instead of newer elements will make your site incompatible with the latest version of HTML and may, despite your best intentions, decrease its accessibility.
The presentational elements (like FONT) and color attributes have been deprecated in order to encourage authors to use style sheets, thus separating page style from page content. For example, the new OBJECT element is far more versatile at handling content from different sources than the deprecated APPLET, and it is designed to degrade more gracefully if coded properly.
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