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Add data for anchor position container queries #28526

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Add data for anchor position container queries #28526

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Add data for anchor position container queries
ddbeck Nov 25, 2025
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ddbeck Dec 5, 2025
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96 changes: 96 additions & 0 deletions css/at-rules/container.json
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,102 @@
"deprecated": false
}
},
"anchor_position_queries": {
"__compat": {
"description": "Anchor position queries (`anchored()`)",
"spec_url": "https://drafts.csswg.org/css-anchor-position-2/#anchored-container-queries",
Comment on lines +39 to +42
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@caugner caugner Dec 5, 2025

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Suggested change
"anchor_position_queries": {
"__compat": {
"description": "Anchor position queries (`anchored()`)",
"spec_url": "https://drafts.csswg.org/css-anchor-position-2/#anchored-container-queries",
"anchored_function": {
"__compat": {
"description": "`anchored()` function",
"spec_url": "https://drafts.csswg.org/css-anchor-position-2/#container-rule-anchored",

"support": {
"chrome": {
"version_added": "143"
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": false
},
"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
}
},
"fallback": {
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@caugner caugner Dec 5, 2025

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Why are we documenting this (behavioral?) subfeatures?

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@ddbeck ddbeck Dec 5, 2025

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This is not a behavioral subfeature. It's a named container query "feature" (in media/container queries terminology, not the BCD sense), as in @container anchored(fallback: <some-value>).

Right now there's only one feature to query against, but it's possible other container query features could exist (e.g., @container anchored(foo-bar: <some-value>) would get a foo-bar key as a peer to fallback).

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@caugner caugner Dec 5, 2025

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Can we add a suffix for clarity?

Suggested change
"fallback": {
"fallback_feature": {

"__compat": {
"description": "`fallback` container feature",
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@caugner caugner Dec 5, 2025

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Given that we're in the context of the @container at feature, mentioning "container" seems repetitive:

Suggested change
"description": "`fallback` container feature",
"description": "`fallback` feature",

"spec_url": "https://drafts.csswg.org/css-anchor-position-2/#anchored",
"support": {
"chrome": {
"version_added": "143"
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": false
},
"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
}
},
"any": {
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@caugner caugner Dec 5, 2025

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Can we also add a suffix for clarity here?

(Unlike CSS properties, it is less obvious that this is a value.)

Suggested change
"any": {
"any_value": {

"__compat": {
"description": "`fallback` container feature",
"spec_url": "https://drafts.csswg.org/css-anchor-position-2/#anchored",
"support": {
"chrome": {
"version_added": "143"
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": false
},
"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
}
}
}
}
},
"scroll-state_queries": {
"__compat": {
"description": "Scroll-state queries",
Expand Down
31 changes: 31 additions & 0 deletions css/properties/container-type.json
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Original file line number Diff line number Diff line change
Expand Up @@ -35,6 +35,37 @@
"deprecated": false
}
},
"anchored": {
"__compat": {
"spec_url": "https://drafts.csswg.org/css-anchor-position-2/#container-type-anchored",
"support": {
"chrome": {
"version_added": "143"
},
"chrome_android": "mirror",
"edge": "mirror",
"firefox": {
"version_added": false
},
"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
}
}
},
"inline-size": {
"__compat": {
"spec_url": "https://drafts.csswg.org/css-conditional-5/#valdef-container-type-inline-size",
Expand Down