重温了下html5

    <form>
        日期<input type="date"/>
        邮件 <input type="email" />
        URL <input type="url" autofocus required placeholder="请输入信息。。。" />
        亮度<input type="range" min="0" max="255"/>
      
        容器<canvas id="c1"></canvas>
        颜色 <input type="color" />
        地址<select>
              <optgroup label="深圳">
                  <option>南山区</option>
                  <option>福田区</option>
              </optgroup>
              <optgroup label="北京">
                  <option>东城区</option>
                  <option>西城区</option>
              </optgroup>
        </select>
    search<input type="text" list="b"/>
        <datalist id="b">
            <option>bus</option>
            <option>car</option>
        </datalist>
        <input type="submit" name="submit" value="提交"/>
    </form>