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Good semantic HTML also improves the [[accessibility]] of web documents (see also [[Web Content Accessibility Guidelines]]).{{Citation needed|date=October 2015}} For example, when a screen reader or audio browser can correctly ascertain the structure of a document, it will not waste the visually impaired user's time by reading out repeated or irrelevant information when it has been marked up correctly.
== Google "rich snippets" ==
In 2010, [[Google]] specified three forms of structured metadata that their systems will use to find structured semantic content within webpages. Such information, when related to reviews, people profiles, business listings, and events will be used by Google to enhance the "snippet", or short piece of quoted text that is shown when the page appears in search listings. Google specifies that that data may be given using [[Microdata (HTML5)|microdata]], [[microformat]]s or [[RDFa]].<ref>{{cite web|title=Rich snippets|url=http://www.google.com/support/webmasters/bin/answer.py?answer=99170|work=Webmaster Central|access-date=26 May 2010}}</ref> Microdata is specified inside <code>itemtype</code> and <code>itemprop</code> attributes added to existing HTML elements; microformat keywords are added inside <code>class</code> attributes as discussed above; and RDFa relies on <code>rel</code>, <code>[[typeof]]</code> and <code>property</code> attributes added to existing elements.<ref>{{cite web|title=Businesses and organizations - About organization information|url=http://www.google.com/support/webmasters/bin/answer.py?answer=146861|work=Webmaster Central|access-date=26 May 2010}}</ref>
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