回答編集履歴
1
蛇足
test
CHANGED
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@@ -15,3 +15,15 @@
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15
15
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}, false);
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```
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１行なら
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```javascript
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document.addEventListener('mouseover',({target:a},b='classList',c='contains',d='hidden',e)=>({nextElementSibling:e}=a,a[b][c]('point')&&e&&e[b][c](d)&&e[b].remove(d)))
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```
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