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The Cascading Style Sheets specification defines the same number of named colors as the HTML 4 spec, namely the 16 HTML colors, and 124 colors from the Netscape X11 color list for a total of 140 names that were recognized by Internet Explorer (IE) 3.0 and Netscape Navigator 3.0. [13]
As HTML (before HTML5) is based on SGML, [2] its parsing also depends on the Document Type Definition (DTD), specifically an HTML DTD (e.g. HTML 4.01 [3] [note 1]). The DTD specifies which element types are possible (i.e. it defines the set of element types) and also the valid combinations in which they may appear in a document.
HTML5 has both a regular text/html serialization and an XML serialization, which is also known as XHTML5. [70] The language is more compatible with HTML 4 and XHTML 1.x than XHTML 2.0, due to the decision to keep the existing HTML form elements and events model. It adds many new elements not found in XHTML 1.x, however, such as section and ...
In such circumstances, some authors conflate the two names as (X)HTML or X(HTML). Like HTML 4.01, XHTML 1.0 has three sub-specifications: strict, transitional, and frameset. Aside from the different opening declarations for a document, the differences between an HTML 4.01 and XHTML 1.0 document—in each of the corresponding DTDs—are largely ...
On 28 October 2014, HTML5 was released as a W3C Recommendation, [32] bringing the specification process to completion. [5] On 1 November 2016, HTML 5.1 was released as a W3C Recommendation. [33] On 14 December 2017, HTML 5.2 was released as a W3C Recommendation. [34]
The opening <!DOCTYPE syntax is followed by separating syntax [3]: 403–404 (such as spaces, [3]: 297–298, 372 or (except in XML) comments opened and closed by a doubled ASCII hyphen), [3]: 372, 391 followed by a document type name [3]: 403–404 (i.e. the name of the root element that the DTD applies to trees descending from). In XML, the ...
The meta element has two uses: either to emulate the use of an HTTP response header field, or to embed additional metadata within the HTML document. With HTML up to and including HTML 4.01 and XHTML, there were four valid attributes: content, http-equiv, name and scheme. Under HTML 5, charset has been added and scheme has been removed.
One prominent difference between quirks and no-quirks modes is the handling of the CSS Internet Explorer box model bug.Before version 6, Internet Explorer used an algorithm for determining the width of an element's box which conflicted with the algorithm detailed in the CSS specification, and due to Internet Explorer's popularity many pages were created which relied upon this non-standard ...