title: Scrape Google books ngrams with RCurl and rvest
body: <p>I'm finding it easy enough to scrape Google books ngrams with RCurl. For the URL "<a href="https://books.google.com/ngrams/graph?content=foo&amp;year_start=1800&amp;year_end=2008&amp;corpus=15&amp;smoothing=3&amp;share=&amp;direct_url=t1%3B%2Cfoo%3B%2Cc0" rel="nofollow noreferrer">https://books.google.com/ngrams/graph?content=foo&amp;year_start=1800&amp;year_end=2008&amp;corpus=15&amp;smoothing=3&amp;share=&amp;direct_url=t1%3B%2Cfoo%3B%2Cc0</a>" I'm just using regex to extract the data after "var data = [{"timeseries":". But when trying to scrape the node I get nowhere. I can see a node "td.line-content" so the code below should work, but it doesn't</p>
  
  <pre><code>html_node(read_html("https://books.google.com/ngrams/graph?content=foo&amp;year_start=1800&amp;year_end=2008&amp;corpus=15&amp;smoothing=3&amp;share=&amp;direct_url=t1%3B%2Cfoo%3B%2Cc0"),"td.line-content")
  </code></pre>
  
  <p>What am I missing?</p>