CSS property text-decoration:underline for <details><summary> not works in Safari. It works in all other (include old) browsers. It works in Safari with other selectors. How make it work?
Can you try latest Safari Technology Preview? Because I fixed this bug.
Here in bug 227282
I use latest 16.5 Safafi Ventura, and observe this bug
Created attachment 467697 [details] STP178 vs Safari 16.6 vs Chrome Canary 119 Test Case: https://jsfiddle.net/he9gb7us/show -> It is fixed in Safari Technology Preview 178.
Created attachment 467744 [details] emphasizes not the full width emphasizes not the full width
<rdar://problem/115858743>
@Dimtry - can you share test case where width is not extended fully as shown in your reference screenshot?
I can't reproduce the problem in Safari 17.0, the <summary> is underlined.