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The Cascading Style Sheets (CSS) specification describes how elements of web pages are displayed by graphical browsers. Section 4 of the CSS1 specification defines a "formatting model" that gives block-level elements—such as p and blockquote—a width and height, and three levels of boxes surrounding it: padding, borders, and margins. [4]
Tag certifying that a website has been checked for well-formed XHTML (above) and CSS (below) markup The Markup Validation Service is a validator by the World Wide Web Consortium (W3C) that allows Internet users to check pre-HTML5 HTML and XHTML documents for well-formed markup against a document type definition (DTD).
To demonstrate specificity Inheritance Inheritance is a key feature in CSS; it relies on the ancestor-descendant relationship to operate. Inheritance is the mechanism by which properties are applied not only to a specified element but also to its descendants. Inheritance relies on the document tree, which is the hierarchy of XHTML elements in a page based on nesting. Descendant elements may ...
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 ...
Text content within an element is represented as a text node in the DOM tree. Text nodes do not have attributes or child nodes, and are always leaf nodes in the tree. For example, the text content "My Website" in the title element and "Welcome" in the h1 element in the above example are both represented as text nodes.
For example, a series of related controls can be grouped within a <fieldset>, which can then have a <legend> added in order to identify their function. Standardized in HTML 4.0; still current. <input /> <input> elements allow a variety of standard form controls to be implemented. Standardized in HTML 2.0; still current. Input Types: type="checkbox"
Basic support for the file-select control was adopted quickly by browser vendors. For example, already Internet Explorer 4, [7] Netscape Navigator 2.0 and Opera 3.5 [8] recognized the input element of type="file" as a file-select control. However, most modern browsers still do not implement the file-select control as it was intended, or lack ...
The <date> input type displays a calendar from which the user can select a date or date range. [ 2 ] [ 3 ] And the color input type can be represented as an input text simply checking the value entered is a correct hexadecimal representation of a color, according to the specification, [ 4 ] or a color picker widget (the latter being the ...