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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Smallest Valid XHTML5 Document
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Validating XHTML5 Documents Online
How To Validate XHTML5 Documents Online? If you have just finished a new XHTML5 document, and you want to make sure that confirms with the XHTML5 specification, you can use the XHTML online validator at https://validator.nu/ . First, you need to change "Parser" field to "XML; load external entities"... 2024-03-17, ∼2637🔥, 0💬

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Number of Elements Defined in HTML5?
How Many Elements Are Defined in HTML5? There are 105 elements defined in HTML5: The root element: html Document metadata elements: head, title, base, link, meta, style Section elements: body, article, section, nav, aside, h1, h2, h3, h4, h5, h6, header, footer, address Grouping elements: p, hr, pre... 2024-03-07, ∼2123🔥, 0💬

Smallest Valid HTML5 Document
What is a Smallest Valid HTML5 Document? If you are interested to see the smallest, but valid, HTML5 document, look at this one: <!DOCTYPE html> <html><he ad><title&gt ;Hello</title>&a mp;lt;/head><bod y><foot... 2024-03-07, ∼2107🔥, 0💬

What Is HTML5?
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, ∼1958🔥, 0💬

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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, ∼1851🔥, 0💬

Top Level Structure of XHTML5 Documents
What is the Top Level Structure of an XHTML5 Document? 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... 2024-03-17, ∼1736🔥, 0💬

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