Access to alternative representations of content
Written by jon on 11:30 AMCSS2 lets users access alternative representations of content that is specified in attribute values when the following are used together:
- attribute selectors.
- the attr() function and the 'content' property'
- the :before and :after pseudo-elements
In the following example, the value of the "alt" attribute for the IMG element is rendered after the image (visually, aurally, etc.):
IMG:after { content: attr(alt) }
Note that the value of the attribute is displayed even though the image may not be (e.g., the user has turned off images through the user interface).
Media types
The CSS2 "media types" (used with @media rules) allow authors and users to design style sheets that will cause documents to render more appropriately on certain target devices. These style sheets can tailor content for presentation on braille devices, speech synthesizers, or tty devices. Using "@media" rules can also reduce download times by allowing user agents to ignore inapplicable rules.
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