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2.15.
Standards-compliant XHTML and CSS
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Improves search engine visibility, reduce page weight, makes content accessible from all web browsers, regardless of capability.
Plone was the first 100% XHTML and CSS standards-compliant CMS in the world, and is based on open standards.
Plone degrades gracefully, and works on any device that supports HTML — including old browsers, cell phones and text-based browsers like Lynx — as well as screen readers used by the blind.
