Gets or sets a base URI to resolve external resource files’ relative URIs to absolute ones while loading an HTML
template document to be assembled and saved to a non-HTML format. The default value is an empty string.
Remarks
When loading an HTML document from a file, its containing folder is used as a base URI by default, which cannot
happen when loading an HTML document from a stream. Set this property to specify a base URI when loading an HTML
document from a stream or to override the default base URI when loading an HTML document from a file.
A value of this property is ignored in the following cases: