Different rotation systems that approximate SRS apply different wall kicks and floor kicks when the player twists the I tetromino.
Official SRS 
Edit
Tetris Worlds, Tetris DS and Tetris The Grand Master Ace are based on the Tetris Guideline, including SRS. They have the following behavior:
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Rotated left
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Soft dropped
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Rotated right
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But the wall kicks are not symmetric, as Tetris Worlds, Tetris Deluxe, Tetris DS and Tetris The Grand Master Ace prefer to kick up rather than down when rotating left:
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Rotated right
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Soft dropped
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Rotated left
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However, an extra block impedes the choice of the upward kick position:
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Rotated right
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Soft dropped
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Rotated left
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The following can be performed instead, at least in tetris DS.
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Rotated left
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Moved right
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Soft dropped
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