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nginx [engine x] is a HTTP server and mail proxy server written by Igor Sysoev.
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The DOCTYPE is a required preamble for HTML5 websites.
Allows a website to define how a page is rendered in Internet Explorer 8, allowing a website to decide to use IE7 style rendering over IE8 rendering.
Websites using https protocol.
The http-equiv attribute provides an HTTP header for the information/value of the content attribute.
The http-equiv attribute can be used to simulate an HTTP response header.