I am trying to figure out what command and default options RStudio uses when pressing the \"knit HTML\" button in RStudio version 0.98.1091 because I get a slightly differen
As @rawr pointed out in the comments:
rmarkdown::render('your_document.Rmd', 'html_document', 'new_titel.html')
works and creates the same document as the Knit HTML button.
Knit HTML