SEO Test Shows Reconfiguring Page Layout Had a Negative Impact on Organic Traffic
https://www.searchpilot.comIn this test, they moved a travel client’s flight search widget from the bottom of the hero image to the top. They found that it resulted in a 7% drop in organic sessions.
From what I understand they did not resort to javascript based single page experiments but instead a full funnel testing by splitting pages instead of users; while this enables testing for Googlebot, it doesn’t allow for measuring the impact on user behaviour.