Introducing view-transitions-mock: A non-visual Polyfill for Same-Document View Transitions

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View Transitions are a powerful Modern Web feature allow for smooth seamless animated transitions two between different states of a web page. They can make for a much more pleasant user experience, but as with any new web platform feature, browser support is not yet fully universal so you need to add some fallback logic to your code.

view-transitions-mock bridges that gap. It is a spec-compliant JavaScript implementation of Same-Document View Transitions that polyfills the entire JavaScript API surface of the spec, but that doesn’t do the animation bits.

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Using 100vw is now scrollbar-aware (in Chrome 145+, under the right conditions)

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From Chrome 145 onwards, 100vw will automatically subtract the size of the (vertical) scrollbar from it if you have forced the html element to always show a vertical scrollbar (using overflow[-y]: scroll) or if you reserve space for it (using scrollbar-gutter: stable). The same applies to vh with a horizontal scrollbar, as well as all small, large, and dynamic variants.

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How to Find the public WebKit Bug from the Apple-internal rdar:// Bug ID

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If you read the Safari release notes – like the Safari 26.2 release notes – you see a lot of trailing “(12345678)”-mentions in the list of fixed bugs. These numbers are Apple-internal bug IDs, as used within Apple’s internal bug tracker (fka?) named “Radar”.

These numbers are not linked to anything because Radar is Apple-internal, so to external people these numbers are practically useless … or are they?

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