可将相关的表单控件置于<fieldset>元素中分成一组。这对长表单来说特别有用
<!DOCTYPE html>
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<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<div>TODO write content</div>>
<fieldset>
<legend>起始标签</legend>
<label>标题:<br />
<input type="text" name="email" /></label><br />
<label>标题:<br />
<input type="text" name="mobile" /></label><br />
<label>标题:<br />
<niput type="text" name="telephone" /></label>
</fieldset>
</body>
</html>