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The exact parsing of HTML in practice has been undefined until recently; see the HTML5 specification for full details, or the working summary (HTML vs. XHTML). In addition to the syntactical differences, there are some behavioral differences, mostly arising from the underlying differences in serialization.
XHTML5 is simply XML-serialized HTML5 data (that is, HTML5 constrained to XHTML's strict requirements, e.g., not having any unclosed tags), sent with one of XML media types. HTML that has been written to conform to both the HTML and XHTML specifications and therefore produces the same DOM tree whether parsed as HTML or XML is known as polyglot ...
XHTML is a separate language that began as a reformulation of HTML 4.01 using XML 1.0. It is now referred to as the XML syntax for HTML and is no longer being developed as a separate standard. [59] XHTML 1.0 was published as a W3C Recommendation on January 26, 2000, [60] and was later revised and republished on August 1, 2002. It offers the ...
Parser License Implementation language(s) Latest date* HTML parsing [1] HTML5-compliant parsing Clean HTML** Update HTML*** HTML Tidy: W3C license: ANSI C
The HTML5 specification does not allow users to define additional entities, as it no longer accepts any DTD to be referenced or extended inside HTML documents (this is still needed in XHTML, which is based on stricter XML parsing rules but allows referencing or defining a DTD in the document header, because XML does not predefine most HTML ...
From January 2000 until HTML 5 was released, all W3C Recommendations for HTML have been based on XML, using the abbreviation XHTML (Extensible HyperText Markup Language). The language specification requires that XHTML Web documents be well-formed XML documents. This allows for more rigorous and robust documents, by avoiding many syntax errors ...
The following tables compare general and technical information for a number of HTML editors.. Please see the individual products' articles for further information, comparison of text editors for information on text editors, and comparison of word processors or information on word processors, many of which have features to assist with writing HTML.
CSS is designed around styling a document, structured in a markup language, HTML and XML (including XHTML and SVG) documents. It was created for that purpose. It was created for that purpose. The code CSS is non-XML syntax to define the style information for the various elements of the document that it styles.