DNN 默认的DOCTYPE在IE 6.0下会触发IE进入quirks模式(
会有什么影响），那如何修改DNN的DOCTYPE呢？
Cathal Connolly给出了一个解决方案
原文：
Whilst
the 4.4 release predominantly focussed on performance and optimisation,
there were a number of other enhancements added to the release (as
always the
changelogis the best place to view changes). One of these, that should be of
interest to skinners and those interested in accessibility standards
& xhtml compliance, is support for skin level
doctypes.
Historically, if you wanted to target your skin/container for a
particular version of html/xhtml, you had to manually edit the
default.aspx page to alter the hardcoded DOCTYPE declaration. With 4.4,
the declaration has been made dynamic, to allow users to declare
particular doctypes with particular skins. To make use of this, you
create a file with the same name as your skin except ending in
doctype.xml (rather than ascx/htm/html) and it’ll be picked up during
skin load. This xml file should contain a single node,SkinDocType, that
contains a declaration of your desired doctype. To ensure that the
parser reads the value correctly, you need to use a CDATA section to
escape out the various < and & characters e.g. If I have a skin
called mypage.asx that I intended to render as XHTML 1.0 strict, then I
would create a file called mypage.doctype.xml which would contain the
following:
<SkinDocType><![CDATA[<!DOCTYPE XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">]]></SkinDocType>
http://www.dotnetnuke.com/Community/BlogsDotNetNuke/tabid/825/EntryID/1226/Default.aspx对此
John Mitchell认为这个解决方案不灵活，每次页面加载的XML解析会降低效率，他提出的解决方案如下：
Brand new in DNN 4.4 is the option to change your
Doctypewhich
Cathal blogged about.
As Cathal pointed out in
this threadthe
implementation will need to be improved for performance because on
every request the DNN framework is looking for an XML file and loading
it into an XML Document to validate the XML.
There is also concern that it is hard to implement with multiple
skins because you would need a different XML file for every Skin.
You can shortcut all of this now and not take the performance hit by using the code below.
Just copy and paste the following code directly into your HTML or .ASCX skin file.
<script runat="server">
Private Sub Page_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim skinDocType as Control = Me.Page.FindControl("skinDocType")
If Not skinDocType is Nothing
CType(skinDocType, System.Web.UI.WebControls.Literal).Text="<!DOCTYPE html PUBLIC ""-//W3C//DTD XHTML 1.0 Strict//EN"" ""http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"">"
End If
End Sub
</script>
时间有限，就不翻译了，贴出来供大家参考。
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