回答編集履歴
1
追記
test
CHANGED
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@@ -25,3 +25,21 @@
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25
25
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</ul>
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```
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28
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29
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30
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31
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多用は禁物でしょうけど
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32
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33
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```CSS
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34
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35
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input:invalid + span{displa:inline;}
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36
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input:valid + span{display:none;}
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```
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```HTML
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42
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43
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<input type="text" required> <span>(入力必須)</span>
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44
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45
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```
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