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Chrome 149 user action pseudo-class top-layer boundary #29960

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Chrome 149 user action pseudo-class top-layer boundary #29960

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07f5ca9
Chrome 149 user action pseudo-class top-layer boundary
chrisdavidmills Jul 1, 2026
4ddb060
Update css/selectors/active.json
chrisdavidmills Jul 3, 2026
e1c42d1
Add Fx impl URL
chrisdavidmills Jul 3, 2026
b2c20b5
Add Fx impl URL
chrisdavidmills Jul 3, 2026
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33 changes: 33 additions & 0 deletions css/selectors/active.json
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Original file line number Diff line number Diff line change
Expand Up @@ -95,6 +95,39 @@
"deprecated": false
}
}
},
"top-layer_ancestor_matching_boundary": {
"__compat": {
"description": "Observes [top-layer ancestor matching boundary](https://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/Pseudo-classes#top-layer_ancestor_matching_boundary) behavior",

@caugner caugner Jul 3, 2026

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https://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/Pseudo-classes#top-layer_ancestor_matching_boundary does not seem to exist yet.

Also: I wonder if the description could describe the behavior, rather than just naming it?

@chrisdavidmills chrisdavidmills Jul 3, 2026

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The content is on its way; see mdn/content#44615.

@chrisdavidmills chrisdavidmills Jul 3, 2026

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I can see why you'd want the description to be a bit more, well, descriptive, but it is tricky in this case, as the behavior change is quite subtle and difficult to describe without a demonstration; hence, linking to the section that describes and demonstrates it in detail.

"spec_url": "https://www.w3.org/TR/selectors-4/#useraction-pseudos:~:text=they%20also%20match%20on%20the%20element%E2%80%99s%20flat%20tree%20ancestors%2C%20up%20to%20and%20including%20the%20first%20top%20layer%20element",
"support": {
"chrome": {
"version_added": "149"
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": false,
"impl_url": "https://bugzil.la/2025235"
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
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},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": true,
"standard_track": true,
"deprecated": false
}
}
}
}
}
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33 changes: 33 additions & 0 deletions css/selectors/focus-within.json
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,39 @@
"standard_track": true,
"deprecated": false
}
},
"top-layer_ancestor_matching_boundary": {
"__compat": {
"description": "Observes [top-layer ancestor matching boundary](https://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/Pseudo-classes#top-layer_ancestor_matching_boundary) behavior",
"spec_url": "https://www.w3.org/TR/selectors-4/#useraction-pseudos:~:text=they%20also%20match%20on%20the%20element%E2%80%99s%20flat%20tree%20ancestors%2C%20up%20to%20and%20including%20the%20first%20top%20layer%20element",
"support": {
"chrome": {
"version_added": "149"
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": false,
"impl_url": "https://bugzil.la/2025235"
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": true,
"standard_track": true,
"deprecated": false
}
}
}
}
}
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33 changes: 33 additions & 0 deletions css/selectors/hover.json
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Original file line number Diff line number Diff line change
Expand Up @@ -153,6 +153,39 @@
"deprecated": false
}
}
},
"top-layer_ancestor_matching_boundary": {
"__compat": {
"description": "Observes [top-layer ancestor matching boundary](https://developer.mozilla.org/docs/Web/CSS/Reference/Selectors/Pseudo-classes#top-layer_ancestor_matching_boundary) behavior",
"spec_url": "https://www.w3.org/TR/selectors-4/#useraction-pseudos:~:text=they%20also%20match%20on%20the%20element%E2%80%99s%20flat%20tree%20ancestors%2C%20up%20to%20and%20including%20the%20first%20top%20layer%20element",
"support": {
"chrome": {
"version_added": "149"
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": false,
"impl_url": "https://bugzil.la/2025235"
},
"firefox_android": "mirror",
"oculus": "mirror",
"opera": "mirror",
"opera_android": "mirror",
"safari": {
"version_added": false
},
"safari_ios": "mirror",
"samsunginternet_android": "mirror",
"webview_android": "mirror",
"webview_ios": "mirror"
},
"status": {
"experimental": true,
"standard_track": true,
"deprecated": false
}
}
}
}
}
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