A similar trick as we used with the h.264 video is also possible to let text disappear after a while. Type some text, click the source button and replace part of your text:
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Following text disappears after five seconds:<br/>
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Roses are red, violets are blue, I am gone, and so...
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with this:
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Following text disappears after five seconds:<br/>
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<div id="question17">
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Roses are red, violets are blue, I am gone, and so...