In this hangout, one webmaster was particularly concerned about a new CSS property that was recently added.
The webmaster asked whether the new CSS property, which was just integrated into Chrome, will have such an impactful effect that it’s important to integrate into every development decision.
John explained that the ranking of the page is based on the rendering of the HTML that has already been loaded. He doesn’t see any new CSS property actually doing all that much to a site’s ranking.
He doesn’t know how much of an effect the CSS property will have, but he doesn’t think the effect will be very strong.
Again, it’s all about the rendered source and what shows up when the site loads, rather than a single CSS property.
This discussion occurs at approximately 6:40 in the video: