I am on this page: Google Drive Login
Wanting to select this input field:

When I use the xpath of the input field:
//*[@id="identifierId"]
or
/html/body/div[1]/div[1]/div[2]/div/div[2]/div/div/div[2]/div/div[1]/div/form/span/section/div/div/div[1]/div/div[1]/div/div[1]/input
I get nada.
Normally this happens when an element is nested within an iframe but not in this case. Or at least I couldn't find the iframe in question. Please help me understand why.
