The ExternalStylesheet method accepts notification of an external stylesheet that is specified more or less independently from the document structure. For example, the <?xml-stylesheet?> processing instruction in OEB documents is an external stylesheet.
HRESULT ExternalStylesheet(
[in] IUnknown* pTag
);
pTag
A tag populated as if it were a <link> tag
Internally, such stylesheets are actually handled as <link> tags. This means that they are held until a <head> is found (or synthesized for this purpose). As a result, any warnings arising from this call may not be sent to the Callback interface immediately.
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