Adobe mbox is a "marketing box," a portion of your Web page that can be configured to show different content in different situations.
A family of standard web feed formats used to publish frequently updated information like blog entries, news headlines, audio and video.
Websites using https protocol.
The DOCTYPE is a required preamble for HTML5 websites.
UTF-8 (8-bit UCS/Unicode Transformation Format) is a variable-length character encoding for Unicode. It is the preferred encoding for web pages.
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.