Google is working on a new rendering tool in the Search Console. It can be used to see how the search engine handles the HTML version of the page. About it told the representative of the search John Mueller during a regular meeting with webmasters.
When a new feature is launched, he said. Listen to his answer, starting at 48:04 of the video below:
On the question, the new tool will differ from the Google for websites, Mueller said:
@rustybrick Not sure which part you're referring to, but sometimes it's useful to see the rendered HTML source/DOM.
— John on 8 March 2017.
