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2-ui/1-document/11-coordinates/2-position-at/solution.md
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2-ui/1-document/11-coordinates/2-position-at/solution.md
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In this task we only need to accuracely calculate the coorindates. See the code for details.
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Please note: the elements must be in the document to read `offsetHeight` and other properties.
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A hidden (`display:none`) or out of the document element has no size.
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