Google’s John Mueller hinted that Google may be bringing the full page from top to bottom as Google renders it in the testing tool’s screenshot section. John said on Twitter “I understand the desire to check full pages, & we’re looking into getting that, but a browser should get pretty close nowadays.”

I believe the tools that do show a rendering only show the top portion of the page and you cannot see what Google is rendering below that section. Here is a screen shot:

John said they are looking into added showing the full page, although a browser is most likely going to show you what you want, espesially since Googlebot is now evergreen with the latest version of Chrome.

Here are the tweets on this topic:

Forum discussion at Twitter.