November 2023 web platform update

Newly available on the web platform
Newly available

lh unit: The CSS lh unit corresponds to the requested line height, the computed value of the line-height property. Some lines may be higher than this based on their content. Learn more.
User activation: The navigator.userActivation API reveals whether the user has interacted with the page through an "activation" gesture such as a click, tap, or key press. User activation gated APIs (such as the fullscreen API) fail without user interaction, and this API allows you to predict such a failure. Learn more.
:user-valid and :user-invalid: The :user-valid and :user-invalid pseudo-classes match form controls that have been marked as valid or invalid based on their validation constraints. Learn more.

Promise.withResolvers(): The Promise.withResolvers() static method is an alternative to the Promise() constructor that returns both the promise and resolution functions. You can use this to access resolve and reject outside the scope of the executor function. Learn more.
Relative colors: The from keyword for color functions (color(), hsl(), oklch(), etc.) creates a new color based on a given color by modifying the values of the input color. Also known as relative color syntax (RCS). Learn more.

light-dark(): The light-dark() CSS function accepts two colors and uses one depending on the current color scheme. Learn more.

light-dark(): The light-dark() CSS function accepts two colors and uses one depending on the current color scheme. Learn more.