Creativity with CSS
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Beyond the visual effects, we can create styles for speech, for printing, for slide-shows, etc.
The very same document, when well-formed, can take various sets of styles for different "media", different sorts of presentations.
We can create styles for the sound when our content is read aloud by a speech synthesizer. We can create styles for printing, even braille printing. We can create styles for slide projections (like a power-point presentation) …
We can do all of this and more by applying various sets of styles to the very same document.