Starting in Chrome 84, content with opacity:0 is no longer counted as the first contentful paint. This brings behavior in line with the specification. The source code of the change can be seen here.
This change affects sites whose content is all opacity:0 during the first paint. After this change, the first contentful paint will be reported the next time visible content paints.
We do not see an impact from this change in our overall metrics, so we believe the effect on most sites will be minimal.
Most users were updated to Chrome 84 the week of July 13, 2020.
