html第二天

- img
             src
             alt
             title
             
        - 列表
            ul
                li
            ol
                li
            dl
                dt
                dd
        - 表格
            table
                thead
                    tr
                        th
                tbody
                    tr
                        td
            colspan = ''
            rowspan = ''
        - label
            用于点击文件，使得关联的标签获取光标
            <label for="username">用户名：</label>
            <input id="username" type="text" name="user" />
        - fieldset
            legend