本文介绍了一种使用CSS的!important指令来确保元素高度为20像素的方法。通过在样式表中设置.treetddiv的高度属性并应用!important指令，可以确保此样式优先级高于其他可能冲突的样式。
the !important CSS directive; here is how the modified source looks like:
1: [...]
2: <html xmlns="http://www.w3.org/1999/xhtml">
3: <head runat="server">
4: <title>Untitled Page</title>
5: <style>
6: .tree td div {
7: height: 20px !important
8: }
9: </style>
10: </head>
11: <body>
12: <form id="form1" runat="server">
13: <div>
14: <asp:TreeView ID="TreeView1" runat="server" ShowLines="True" CssClass="tree">
15: <Nodes>
16: <asp:TreeNode Text="New Node" Value="New Node">
17: <asp:TreeNode Text="New Node" Value="New Node">
18: <asp:TreeNode Text="New Node" Value="New Node">
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