Nothing
tt = xmlTree("doc")
# Shows that we can create the children within the call to create
# a parent.
tt$addTag("a",
tt$addTag("b", tt$addTag("c")),
tt$addTag("d", tt$addTag("e")))
Any scripts or data that you put into this service are public.
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.