input自动触焦写法: autofocus属性
<input type="search" autofocus="" />
input自动验证写法:required属性
<input type="email" required="required"/>
input自动补充提示的写法:
<input type="text" name="name" autocomplete="on" value="" />
input即能输入又能有下拉提示的写法:
<input type="text" list="detectives" />
<datalist id="detectives">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
</datalist>