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要素の高さを取得する方法。getBoundingClientRectについて。
![Solved] Cannot read properties of null (reading 'getBoundingClientRect')](https://www.web-brackets.com/storage/forum/16384404371.png "Solved] Cannot read properties of null (reading 'getBoundingClientRect')")
Solved] Cannot read properties of null (reading 'getBoundingClientRect')
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座標
Element.getBoundingClientRect
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