HTML5 menu 标签

<menu type="toolbar">
<li> 
<menu label="File"> 
<button type="button" onclick="file_new()">New...</button> 
<button type="button" onclick="file_open()">Open...</button> 
<button type="button" onclick="file_save()">Save</button> 
</menu></li>
<li> 
<menu label="Edit"> 
<button type="button" onclick="edit_cut()">Cut</button> 
<button type="button" onclick="edit_copy()">Copy</button> 
<button type="button" onclick="edit_paste()">Paste</button> 
</menu>
</li>
</menu>