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Can somebody reproduce? Go to https://github.com/w3c/csswg-drafts/issues/7535 and resize the browser window
Can you clarify what you want us to try?
The screenshot shows that the code word
!important
is broken in Firefox Nightly. This never happens in other browsers. Resize the browser window and check if that word breaks.
I filed a bug here: https://bugzilla.mozilla.org/show_bug.cgi?id=1848049