Document write adding style sheet
In order to set a "default" style property, one can use 'BODY' as selector: with tags. The second selector matches a subset of the first: 'LI' elements with at least two 'UL' ancestors. To make it easier to manage style on a site basis, this specification describes how to use HTTP headers to set the style sheets to be applied to a document. While the example influences only one of manyproperties used in rendering an HTML document, it qualifies as an independent style sheet. Safely Applying Rules Since browser support for insertRule isn't as global, it's best to create a wrapping function to do the rule application. Style sheet languages may include features for describing media dependencies within the same style sheet. This type of selector is referred to as a "contextual selector". It can be attached to an element using the style attribute. Any style rule defined in the style sheet itself override conflicting rule in the imported style sheets. Instead of setting all style properties, one can create defaults and then list the exceptions. Contextual selectors look for ancestor relationships, but other relationships e.
Independence from specific style sheet languages This specification doesn't tie HTML to any particular style sheet language. This allows user agents to avoid retrieving inappropriate style sheets.
Combined with other style sheets it will determine the final presentation of the document. Not all style sheet languages support cascading.
External style sheets are the most flexible because with an external style sheet, you can change the look of an entire website by updating just one file. Sometimes it's useful to include rendering instructions within the document to which they apply, either grouped at the start of the document, or in attributes of the elements throughout the body of the document.
While the intentions have been good -- to improve the presentation of Web pages -- the techniques for doing so have had unfortunate side effects. Media dependencies HTML allows authors to specify documents in a media-independent way.
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Alternate styles Authors may wish to offer readers several ways to view a document. This type of selector is referred to as a "contextual selector". This specification allows authors to specify a preferred style sheet as well as alternates that target specific users or media. Contextual selectors consist of several simple selectors as arguments to the "contextual" function. This option mixes style with content with a corresponding loss of the advantages of traditional style sheets The 'LINK' element references alternative style sheets that the reader can select, while imported style sheets are automatically merged with the rest of the style sheet. The first way is through the standard insertRule method: sheet. Keep this strategy in mind on your next big app, as it may save you work in both code and element processing.
The following example demonstrates how style rules are embedded inside a web page. An external style sheet holds all the style rules in a separate document that you can link from any HTML document on your site.
Inserting Rules Stylesheets have an insertRule method which isn't available in earlier IE's but is now the standard for rule injection. A style sheet intended for screen use may be applicable when printing, but is of little use for speech-based browsers.
It can therefore be of special importance as a style sheet selector.
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