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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]
From the late 2000s onward, the intensive use of the Web by mobile agents motivated "liquid layouts" and responsive elements for the growing variety of screen sizes. [5] In the 2010s, the intensive use of popular JavaScript layout frameworks , such as Bootstrap , inspired CSS flex-box and grid layout specifications.
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 padding of an element is the space around the content but which still forms part of the element. Padding should not be used to create white space between two elements. Any background style assigned to the element, such as a background image or color, will be visible within the padding. Increasing the size of an element's padding increases ...
When used in conjunction with the table element, it specifies the amount of space between the border of a table cell and its contents. [ 1 ] [ 2 ] Cellpadding is an attribute of an individual cell in a table, so each cell in a table can be assigned its own cellpadding value, [ 3 ] if not assigned however, the default value for cellpadding is 1 .
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.
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 [clarification needed], 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 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.