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One of the most noticeable differences between HTML and XHTML is the rule that all tags must be closed: empty HTML tags such as <br> must either be closed with a regular end-tag, or replaced by a special form: <br /> (the space before the '/' on the end tag is optional, but frequently used because it enables some pre-XML Web browsers, and SGML ...
output to DVI, Portable Document Format (PDF), HTML, DocBook, others. TeXmacs format: 1998 Joris van der Hoeven: Text editor/TeXmacs editor: PDF or PostScript files. Converters exist for TeX/LaTeX and XHTML+Mathml: Textile: 2002 [3] Dean Allen Text editor: Web browser (XHTML or HTML output), reference and tester (uses latest PHP-Textile version ...
In SGML, HTML and XML documents, the logical constructs known as character data and attribute values consist of sequences of characters, in which each character can manifest directly (representing itself), or can be represented by a series of characters called a character reference, of which there are two types: a numeric character reference and a character entity reference.
There are various differences between XHTML and HTML. The Document Object Model (DOM) is a tree structure that represents the page internally in applications, and XHTML and HTML are two different ways of representing that in markup. Both are less expressive than the DOM – for example, "--" may be placed in comments in the DOM, but cannot be ...
Later, HTML was reformulated (version 2.0) to be more of an SGML application; however, the HTML markup language has many legacy- and exception-handling features that differ from SGML's requirements. HTML 4 is an SGML application that fully conforms to ISO 8879 – SGML. [14]
The difference with the GIF image, is that the SVG image is parsed within the SGML document, according to the declarations in the DTD, where the GIF image is just referenced as an opaque external object (which is not parsable with SGML) via its "data" attribute (whose value type is an opaque ENTITY).
Extensible HyperText Markup Language (XHTML): HTML reformulated in XML syntax. XHTML Basic – a subset of XHTML for simple (typically mobile, handheld) devices. It is meant to replace WML, and C-HTML. XHTML Mobile Profile (XHTML MP) – a standard designed for mobile phones and other resource-constrained devices.
In HTML and SGML, a parser needed to know certain rules about elements during parsing, such as what elements could be contained within other elements and which elements implicitly close the previous element. This is because in HTML and SGML, closing tags and even opening tags were optional on some elements.