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An important type of web agent that does crawl and read web pages automatically, without prior knowledge of what it might find, is the [[Web crawler]] or search-engine spider. These software agents are dependent on the semantic clarity of web pages they find as they use various techniques and [[algorithm]]s to read and index millions of web pages a day and provide web users with [[Web search engine|search facilities]].
In order for search-engine spiders to be able to rate the significance of pieces of text they find in HTML documents, and also for those creating mashups and other hybrids, as well as for more automated agents as they are developed, the semantic structures that exist in HTML need to be widely and uniformly applied to bring out the meaning of published
While the true semantic web may depend on complex [[Resource Description Framework|RDF]] [[Ontology (information science)|ontologies]] and [[metadata]], every HTML document makes its contribution to the meaningfulness of the Web by the correct use of headings, lists, titles and other semantic markup wherever possible. This "plain" use of HTML has been called "Plain Old Semantic HTML" or POSH.<ref>{{cite web |url=http://microformats.org/wiki/posh |title=Plain Old Semantic HTML (POSH) |date=April 20, 2007 |website=Microformats Wiki |publisher=microformats community |accessdate=May 4, 2013}}</ref> The correct use of Web 2.0 'tagging' creates [[Folksonomy|folksonomies]] that may be equally or even more meaningful to many.<ref name="Semantic_Web_Revisted"/> [[HTML 5]] introduced new semantic elements such as <code>section</code>, <code>article</code>, <code>footer</code>, <code>progress</code>, <code>nav</code>, <code>aside</code>, <code>mark</code>, and <code>time</code>.<ref name="DSG">{{cite web|title=Understanding Semantic HTML and Its Applications for 2015 and Beyond|url=http://www.dallasseogeek.com/uncategorized/understanding-semantic-html-and-its-applications-for-2015-and-beyond/|publisher=Dallas SEO Geek|accessdate=26 October 2015}}</ref><ref>{{cite web|last1=Robinson|first1=Mike|title=Let's Talk about Semantics|url=http://html5doctor.com/lets-talk-about-semantics/|publisher=HTML 5 Doctor|accessdate=26 October 2015}}</ref> Overall, the goal of the [[W3C]] is to slowly introduce more ways for browsers, developers, and crawlers to better distinguish between different types of data, allowing for benefits such as better display on browsers on different devices.<ref name="DSG" />
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