Use include_meta() to explicitly declare the meta() tags as an HTML
dependency. In general, this is not required when knitting to an HTML
document. This function explicitly attaches an htmltools::htmlDependency()
and may work in some unusual cases.
Value
An htmltools::htmlDependency() containing the metadata tags to be
included in the <head> of the HTML document.
See also
Other meta_actions:
write_meta()