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<!DOCTYPE html>, case-insensitively. With the exception of the lack of a URI or the FPI string (the FPI string is treated case sensitively by validators), this format (a case-insensitive match of the string !DOCTYPE HTML) is the same as found in the syntax of the SGML based HTML 4.01 DOCTYPE. Both in HTML4 and in HTML5, the formal syntax is ...
Some tags that resemble HTML are actually MediaWiki parser and extension tags, and so are actually wiki markup. HTML included in pages can be validated for HTML5 compliance by using validation . Note that some elements and attributes supported by MediaWiki and browsers have been deprecated by HTML5 and should no longer be used.
Microsoft first introduced the EdgeHTML rendering engine as part of Internet Explorer 11 in the Windows Technical Preview build 9879 on November 12, 2014. [8] Microsoft planned to use EdgeHTML both in Internet Explorer and Project Spartan; in Internet Explorer it would exist alongside the Trident 7 engine from Internet Explorer 11, the latter being used for compatibility purposes.