这与不可能
textarea。您正在寻找的是一个内容可编辑的 div，这很容易做到：
<div contenteditable="true"></div>
jsFiddle
div.editable { width: 300px; height: 200px; border: 1px solid #ccc; padding: 5px;}strong { font-weight: bold;}<div contenteditable="true">This is the first line.<br>See, how the text fits here, also if<br>there is a <strong>linebreak</strong> at the end?<br>It works nicely.<br><br><span >Great</span>.</div>
