HTMLElement: isContentEditable プロパティ

<p id="firstParagraph">編集不可能な段落</p>
<p id="secondParagraph" contenteditable="true">編集可能な段落</p>
<p id="infoText1">最初の段落を編集できますか？</p>
<p id="infoText2">2 番目の段落を編集できますか？</p>

const firstParagraph = document.getElementById("firstParagraph");
const secondParagraph = document.getElementById("secondParagraph");
const infoText1 = document.getElementById("infoText1");
const infoText2 = document.getElementById("infoText2");
infoText1.textContent += " " + firstParagraph.isContentEditable;
infoText2.textContent += " " + secondParagraph.isContentEditable;