rvest how to select a specific css node by id

Question

I\'m trying to use the rvest package to scrape data from a web page. In a simple format, the html code looks like this:

Answer 1

This will work just fine with straight CSS selectors:

library(rvest)

doc <- '

   
   
'

pg <- html(doc)
html_attr(html_nodes(pg, "div > input:first-of-type"), "value")

## [1] "123"