实例
<form>
<label>Name:
<inputname="submitted-name"autocomplete="name">
</label>
<button>Save</button>
</form>
<formmethod="post">
<label>Name:
<inputname="submitted-name"autocomplete="name">
</label>
<button>Save</button>
</form>
<formmethod="post">
<fieldset>
<legend>Title</legend>
<label><inputtype="radio"name="radio"> Select me</label>
</fieldset>
</form>