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A block level quotation, for when the quotation includes block level elements, e.g. paragraphs. The cite attribute (not to be confused with the <cite> element) may give the source, and must be a fully qualified Uniform Resource Identifier. The default presentation of block quotations in visual browsers is usually to indent them from both margins.
If a paragraph is preceded by a title or subhead, the indent is superfluous and can therefore be omitted. [2] The Elements of Typographic Style states that "at least one en [space]" should be used to indent paragraphs after the first, [2] noting that that is the "practical minimum". [3] An em space is the most commonly used paragraph indent. [3]
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).
In contrast with name-value pair attributes, there are some attributes that affect the element simply by their presence in the start tag of the element, [7] like the ismap attribute for the img element. [78] There are several common attributes that may appear in many elements : The id attribute provides a document-wide unique identifier for an ...
Traditional line length research, limited to print-based text, gave a variety of results, but generally for printed text it is widely accepted that line lengths fall between 45 and 75 characters per line (cpl), though the ideal is 66 cpl (including letters and spaces). [1]
For these reasons, and in support of a more semantic web, attributes attached to elements within HTML should describe their semantic purpose, rather than merely their intended display properties in one particular medium.
The MediaWiki Sanitizer.php does some cleanup on attributes. A best practice is to use the proper syntax. Discards attributes not on a whitelist for the given element. Turns broken or invalid entities into plaintext. Double-quotes all attribute values. Attributes without values are given the name as value. Double attributes are discarded.
The HTML elements in the document are available as a hierarchical tree of individual objects, making it possible to examine and modify an element and its attributes by reading and setting properties and by calling methods. The text between elements is also available through DOM properties and methods.