HTML and CSS Reference
In-Depth Information
8.4.12.5. Cue properties
Cue properties let you insert audible cues before or after an element.
For example, you might precede each chapter in a book with a musical
cue, or denote the end of quoted text with an audible tone.
The
cue-before
and
cue-after
properties take as their value the URL of a
sound file, which the browser loads and plays before or after the styled
document element, respectively. Technically, the sound can be of any
duration, but the presumption is that audible cues are short and nonin-
trusive, enhancing the audio experience instead of overwhelming it.
Use the
cue
property to set both the
cue-before
and
cue-after
properties
at once. If you provide one URL value, it sets both cue sounds; with two
values, the first sets the
cue-before
sound and the second sets the
cue-
after
sound.
8.4.12.6. Audio mixing
To create a more pleasant listening experience, you may want to play
background music during a spoken passage. The
play-during
property
meets this need. Its values are the URL of the sound file and several
keywords that control playback.
The
repeat
keyword repeats the background audio until the spoken con-
tent is complete. If you don't use this keyword, the background sound
plays once, even if it is shorter than the spoken content. A background
sound that is longer than the spoken content ends when the content
ends.
The
mix
keyword tells the CSS2-conscious browser to meld the back-
ground sound with any other background sounds that may be playing
as defined by some parent element. If you don't use this keyword,
child-element background sounds replace parent-element background
sounds, which resume when the current element has finished.
