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Classes are defined in the HTML document (generated by the server or by JavaScript). They are used as selectors in CSS. Learn to use the browser inspectors of Firefox, lE, Chrome or Safari to inspect the webpages. By default much of the CSS and JavaScript resources are processed for efficiency.
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 ...
More complex selectors can select elements based on, e.g., their context, attributes and content. Properties All style sheet languages have some concept of properties that can be given values to change one aspect of rendering an element. The "font-size" property of CSS is used in the above example.
This script and CSS makes the sidebar stay in the same position on the screen as you scroll. This may have undesirable side effects in Chrome; e.g., when viewing a page like the very common.css page you just edited to put this code in, the viewable content will become much shorter, and require vertical scrolling in a frame.
Style may be chosen specifically for a piece of content, see e.g., color; scope of parameters Alternatively, style is specified for CSS selectors, expressed in terms of elements, classes, and ID's.
The id attribute provides a document-wide unique identifier for an element. [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 ...
Knowing which content on your page is in a -show class. It may be useful to know which content on your page is not visible to all users. To do so, you can add something like the following to your common.css—supposing for the purposes of this example that you are an extendedconfirmed new page reviewer:
CSS does not just apply to visual styling: when spoken out loud by a voice browser, CSS styling can affect speech-rate, stress, richness and even position within a stereophonic image. 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 ...