R: Embed a URL as an HTML iframe or a screenshot in 'knitr'...
include_url
R Documentation
Embed a URL as an HTML iframe or a screenshot in knitr documents
Description
When the output format is HTML, include_url() inserts an iframe in the
output; otherwise it takes a screenshot of the URL and insert the image in
the output. include_app() takes the URL of a Shiny app and adds
?showcase=0 to it (to disable the showcase mode), then passes the URL
to include_url().