مساعدة في تطبيق حركة بالجافاسكربت

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<p>This is the first content. Don't you think it's great ?</p>
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<p>And now, the second content.</p>
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<p>Another one. It may be useful for many things no ?</p>
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<p>And the last one... So, what's your opinion on this script ?</p>
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