View Transitions: making callback non-nullable

Category: Miscellaneous
Type: No developer-visible change
Status: Enabled by default (Chrome 120)
Intent stage: None

Summary

The `startViewTransition` call currently takes an optional nullable callback type with a default value of null: `startViewTransition(optional UpdateCallback? callback = null)` This feature changes this to be a non-nullable type: `startViewTransition(optional UpdateCallback callback)` More details: https://github.com/w3c/csswg-drafts/issues/9460

Standards & signals

Specification: https://drafts.csswg.org/css-view-transitions-1/#additions-to-document-api
Firefox: No signal
Safari: No signal
Web developers: No signals

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