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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]
CSS Flexible Box Layout, commonly known as Flexbox, [2] is a CSS web layout model. [4] It is in the W3C 's candidate recommendation (CR) stage. [ 2 ] The flex layout allows responsive elements within a container to be automatically arranged depending on viewport (device screen) size.
A superset of CSS 1, CSS 2 includes a number of new capabilities like absolute, relative, and fixed positioning of elements and z-index, the concept of media types, support for aural style sheets (which were later replaced by the CSS 3 speech modules) [47] and bidirectional text, and new font properties such as shadows.
Such elements might be gathered together as footnotes on a page—instead of appearing in the place suggested by their position within the HTML source. The style sheet author might also define a rule with the .notation selector and define the property font-size: small;. The style attribute provides a way of applying element-specific style rules.
Another example is the Ajax programming technique, where, for example, clicking a hypertext link may cause JavaScript code to retrieve the text for a new price quotation to display in place of the current one within the page, without re-loading the whole page. When the new text arrives back from the server, the JavaScript must identify the ...
Luke Wroblewski has summarized some of the RWD and mobile design challenges and created a catalog of multi-device layout patterns. [15] [16] [17] He suggested that, compared with a simple HWD approach, device experience or RESS (responsive web design with server-side components) approaches can provide a user experience that is better optimized for mobile devices.
For example, an HTML element "span" without content can, through its class and id, provide parameters for JS specifying CSS for any parts of the page. For example, if a page contains a "span" element with class FA and id lc, MediaWiki:Monobook.js specifies the style and title of elements "li" of class interwiki-lc, thus controlling the style ...
An HTML element is a type of HTML (HyperText Markup Language) document component, one of several types of HTML nodes (there are also text nodes, comment nodes and others). [vague] The first used version of HTML was written by Tim Berners-Lee in 1993 and there have since been many versions of HTML.