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Where element names the HTML element type, and attribute is the name of the attribute, set to the provided value. The value may be enclosed in single or double quotes, although values consisting of certain characters can be left unquoted in HTML (but not XHTML). [2] [3] Leaving attribute values unquoted is considered unsafe. [4]
Informally, HTML elements are sometimes referred to as "tags" (an example of synecdoche), though many prefer the term tag strictly in reference to the markup delimiting the start and end of an element. Element (and attribute) names may be written in any combination of upper or lower case in HTML, but must be in lower case in XHTML. [8]
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.
The name of an HTML element is the name used in the tags. The end tag's name is preceded by a slash character, / , and that in empty elements the end tag is neither required nor allowed. If attributes are not mentioned, default values are used in each case.
The CSS selectors, expressed in terms of elements, classes and id's, relevant for the style of the page body include the following. As far as possible, examples are given, which show the result for the current style settings: : link — links — example: Help:Index ; default: help:index (See a vs :link): link: link: link: visited: link ...
HTML 5 introduces a number of input tags that can be represented by other interface elements. Some are based upon text input fields and are intended to input and validate specific common data. These include <email> to enter email addresses, <tel> for telephone numbers, <number> for numeric values.
Inline styles are CSS style assignments that have been applied to an element using the style attribute. You can examine and set these styles by retrieving the style object for an individual element. For example, to highlight the text in a heading when the user moves the mouse pointer over it, you can use the style object to enlarge the font and ...
In both HTML and CSS, the list is separated by commas. To avoid unexpected results, the last font family on the font list should be one of the generic families which are by default always available. In the absence of a font being found, the web browser will use its default font, which may be a user-defined one.