Top Level Structure of XHTML5 Documents

Q

What is the Top Level Structure of an XHTML5 Document?

✍: FYIcenter.com

A

An XHTML5 document is the XML serialization format of an HTML5 document. The top level structure of an XHTML5 document consists of three parts:

XML processing instruction - Provides XML version information and character set declaration.
Document type declaration - Provides the document type and version information.
Document root element - Provides the root element of the document: html. It must include the "xhtml" namespace definition.

The following tutorial sample shows you how the HTML5 document top level structure looks like:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html xmlns="http://www.w3.org/1999/xhtml">
<html>
 (Second level structure)
</html>

⇒ Smallest Valid XHTML5 Document

⇐ Validating HTML5 Documents Online

⇑ Introduction of HTML5

⇑⇑ HTML Tutorials

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What Is HTML5? HTML5 is the fifth version of the HTML standard. HTML5 was published as a W3C Recommendation on October 28, 2014. HMTL5 is a major redesign of the HTML standard to merge HTML 4, XHTML 1 and DOM Level 2 HTML into a single standard. Main features of HTML5 are: Added new markup elements:... 2024-03-07, ∼2161🔥, 0💬

Top Level Structure of XHTML5 Documents
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Who Developed XHTML 1.0?
Who Developed XHTML? XHTML was developed by W3C HTML Working Group with Steven Pemberton as the group chair. ⇒ Number of Tags Defined in XHTML 1.0? ⇐ What Is XHTML 1.0? ⇑ Introduction of XHTML 1.0 ⇑⇑ HTML Tutorials 2023-11-06, ∼2037🔥, 0💬

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