回答編集履歴
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参考リンク追記
test
CHANGED
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@@ -29,3 +29,17 @@
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document.getElementById('sub').addEventListener('click', e => document.getElementById('num').stepDown() );
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```
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---
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参考：
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> The method will not cause the value to go below the min value set or defy the constraints set by the step attribute.
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[HTMLInputElement.stepDown() - Web APIs | MDN](https://developer.mozilla.org/en-US/docs/Web/API/HTMLInputElement/stepDown)
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