| # First Input Delay Changes in Chrome 91 |
| |
| ### Disable double-tap-to-zoom on mobile viewports |
| |
| 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. |
| |
| [Relevant bug](https://bugs.chromium.org/p/chromium/issues/detail?id=1108987) |
| |
| ## When were users affected? |
| |
| Chrome 91 is currently scheduled to be released the week of May 25, 2021. |
