我试图弄清楚哪里是插入位置的最佳位置：fiuxed代码到我的下面的代码中。我想在滚动时让内容保持在页面顶部？谢谢！
[_ table width =“100％”＆gt; [_ tr＆gt; [_ td width =“50％”style =“text-align：left”valign =“bottom”＆gt; [ i ]过去一周[ u ] [ b ] [ / b ] [ / u ] [ / td ] [_ td width =“40％”colspan =“3”＆gt; [_ table width =“100％”＆gt; [_ tr> [ td width =“25％”style =“text -align：center“valign =”bottom“＆gt;从不[ / td_] [ td width =“25％”style =“text-align：center”valign =“bottom”＆gt;一旦[ / td_] [ td width =“25％”style =“text-align：center”valign =“bottom”＆gt;几次[ / td_] [ td width =“25％”style =“text-align：center”valign =“bottom”＆gt; Everyday [ / td _] [ / tr ] [ / table ] [ / td ] [_ td width =“10％”style =“text-align：center”valign =“bottom”＆gt;如果遇险，请勾选此框