Return units in which a cell width is measured depending on the
specified type: 0 means "null", 1 means "auto", 2 means "50ths-of-percent",
and 3 means "twips".
Clear font, shading, and underline style for further merge
another character context with this context (this context is considered
as a templated aplied to another context).
Return the current fill color which will be either highlight color,
or background color, if no highlighting specified, or null, if both
highlight and background color do not specified.
Test the tree of children of the specified node and return the first
node (this node or its direct or indirect child) having a single text
node child only.