HTML and CSS Reference
In-Depth Information
(length) value equal to the distance between the edge of the marker
and the edge of the associated element. For example, to ensure that our
equation numbers get shifted 0.5 inches away from the related equa-
tion, we could use:
h1:before { counter-increment : chapter;
counter-reset : equation }
blockquote:after { counter-increment : equation;
display : marker;
content : "("counter(chapter, upper-roman) "-" counter(equation) ")";
marker-offset : 0.5in }
8.4.12. Audio Properties
From its humble beginnings, HTML has been a visual medium for com-
puter display devices. Although increasing attention has been paid to
other media as the standard evolved, CSS2 is the first real effort to com-
prehensively address using HTML/XHTML documents for nonvisual me-
For example, CSS2 forecasts that someday some browsers will be able
to speak the textual content of a document, using some sort of text-to-
speech technology. Such a browser would be of enormous help for the
visually impaired and would also allow web browsing via the phone and
other devices where a visual display is not readily available or usable.
Imagine the excitement of driving down the road while your favorite web
pages are read to you! [*]
[*] Conversely, imagine the annoyance of someone having web pages read to them while you try to
enjoy a quiet meal or watch a movie. We are constantly reminded that every advance in technology
has a dark side.
CSS2 attempts to standardize these alternative renderings by defining a
number of properties that control the aural experience of a web listen-
er. None of them is currently supported in any popular browser, but we
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