Created attachment 468317 [details] HTML and CSS to reproduce the bug For all these following cases, set a `container` property with `inline-size` value in the `html` element (as an Initial Containing Block) Command-+ zoom: 2. Zoom+- in the webpage, nothing happen 3. Reload the page to see the zoom effect `prefers-` Media Features: 1. When media queries are updated from the device's operating system, or the user agent (`prefers-color-scheme` or `prefers-contrast` for instance) anything is updated. 3. You have to reload the page to update the page and custom properties. Precedent from another page: 1. Open a link in this page 2. Click on precedent and once in a while the page is not rendered (a blank page occurs). 3. Again, reload the page and it renders. All this cases can be reproduced here: https://romanczerki.es/ Also, https://bugs.webkit.org/show_bug.cgi?id=261649 seems related
<rdar://problem/117433388>