Newbie question: live CSS changes using GTK Inspector

I’m trying out Inspector and i’m a little confused about the live CSS editor. I’ve targeted a Nautilus window and added some CSS as a test:

window {
  border-top-left-radius:5px;
}

This seems to have no effect on the appearance, although the updated CSS rule is shown in the node list:

How would this work in practice? Is there something i need to do to make the change visible in the Nautlius window?

Thanks for any tips and insights.

[edit] my bad, it seems there was an extension interfering with the drawing updates.

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