Relative position IS a part of normal flow

Just before the block is displayed, the browser offsets its position
The browser figures out where the block is supposed to go (in the flow), the space for it is reserved, then at the last minute offset it.

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Once upon a midnight dreary, while I pondered, weak and weary, Over many a quaint and curious volume of forgotten lore, While I nodded, nearly napping, suddenly there came a tapping, As of someone gently rapping, rapping at my chamber door. " 'Tis some visitor," I muttered, "tapping at my chamber door; Only this, and nothing more." And the raven, never flitting, still is sitting, still is sitting On the pallid bust of Pallas just above my chamber door; And his eyes have all the seeming of a demon's that is dreaming. And the lamplight o'er him streaming throws his shadow on the floor; And my soul from out that shadow that lies floating on the floor Shall be lifted---nevermore!
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