On user agents supporting mobile viewport, the actual visual viewport may be smaller than the layout viewport. Now layout shifts out of the visual viewport are ignored. Source code for this change
All of these changes only affect sites with specific types of content. Here are the specifics for each change:
Sites using opacity:0 to hide layout changes should see a decrease in their Cumulative Layout Shift scores.
Sites may see a decrease in their Cumulative Layout Shift scores on user agents supporting mobile viewport when the visual viewport is smaller than the layout viewport.
Chrome 89 is currently scheduled to be released the week of March 2, 2021.