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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]
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 ...
Using the CSS display property, the container can be defined as either flex or inline-flex. Flex item Any direct child element held within the flex container is considered a flex item. Any text within the container element is wrapped in an unknown flex item. Axes Each flex box contains two axes: the main and cross axes.
[7] [8] [9] This can be used as CSS selector to provide presentational properties, by browsers to focus attention on the specific element, or by scripts to alter the contents or presentation of an element. Appended to the URL of the page, the URL directly targets the specific element within the document, typically a sub-section of the page.
Dynamic styles are a key feature of DHTML. By using CSS, one can quickly change the appearance and formatting of elements in a document without adding or removing elements. This helps keep documents small and the scripts that manipulate the document fast. The object model provides programmatic access to styles.
column-content – overall space within the margins of which the content exists. firstHeading – the class of the heading tag at the top of every page; contentSub – the name of the wiki immediately underneath the main heading, but above the body text; content – the white background, thin bordered box which contains the main page content.
Historically, there have been other methods for controlling web page layout methods, such as tables, floats, and more recently, CSS Flexible Box Layout (flexbox). CSS grid is currently not an official standard (it is a W3C Candidate Recommendation ) although it has been adopted by the recent versions of all current major browsers.
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.