Double-tap-to-zoom (DTZ) is a gesture used to zoom into text. Previously, DTZ was disabled when either zooming was disabled (min-zoom equal to max-zoom) or when the content width fits the viewport width. After this change, we also disable DTZ when the viewport meta tag specifies width=device-width or initial-scale>=1.0, even when implicitly doing so, like for example in minimum-scale=1.5, maximum-scale=2.
Because DTZ negatively impacts FID and the amount of pages where DTZ is disabled is increased, we expect some sites to see better FID scores.
Chrome 91 is currently scheduled to be released the week of May 25, 2021.
