HTML記述 <div id="div_1"> <p><input type="button" value="説明を表示する" style="WIDTH:10em" onClick="document.getElementById('div_2').style.display='block'; document.getElementById('div_1').style.display='none'"></p> </div> <div id="div_2" style="display:none"> <p><input type="button" value="説明を隠す" style="WIDTH:10em" onClick="document.getElementById('div_2').style.display='none'; document.getElementById('d
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