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[css-contain-3] Tweak the spec for style() queries #8127 #8756

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merged 2 commits into from
May 3, 2023
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[css-contain-3] Tweak the spec for style() queries #8127 #8756

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42fbb53
[css-contain-3] Tweak the spec for style() queries #8127
lilles Apr 24, 2023
8a1adea
Reformulate and add general-enclosed evaluation
lilles May 3, 2023
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23 changes: 10 additions & 13 deletions css-contain-3/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -602,7 +602,6 @@ Container Queries: the ''@container'' rule</h3>
<dfn><<style-in-parens>></dfn> = ( <<style-query>> )
| ( <<style-feature>> )
| <<general-enclosed>>
<dfn><<style-feature>></dfn> = <<ident>> : <<declaration-value>> | <<ident>>
</pre>

The keywords ''container-name/none'', ''and'', ''not'', and ''or''
Expand All @@ -622,7 +621,8 @@ Container Queries: the ''@container'' rule</h3>
each [=container feature=] in the <<container-query>>
is evaluated against that [=query container=].
If no ancestor is an eligible [=query container=],
then the [=container query=] is ''unknown'' for that element.
then the [=container query=] is ''unknown'' for that element. As for media queries,
<<general-enclosed>> evaluates to ''unknown''.

<div class=example>
As with [=media queries=],
Expand Down Expand Up @@ -903,18 +903,15 @@ Style Container Features</h3>
It is a boolean combination of
individual <dfn>style features</dfn> (<<style-feature>>)
that each query a single, specific property of the [=query container=].
The syntax of a <dfn><<style-feature>></dfn> is the same as for a [=declaration=]
[[!CSS-SYNTAX-3]],
and its query is true if
the [=computed value=] of the given property on the [=query container=]
matches the given value
(which is also [=computed value|computed=] with respect to the [=query container=]),
unknown if the property or its value is invalid or unsupported,
and false otherwise.
The syntax of a <dfn><<style-feature>></dfn> is either the same as for a valid [=declaration=]
[[!CSS-SYNTAX-3]], a [=supported CSS property=], or a <<custom-property-name>>.

Its query evaluates to true if the [=computed value=] of the given property on the
[=query container=] matches the given value (which is also [=computed value|computed=]
with respect to the [=query container=]), and false otherwise.

A [=style feature=] can also be a property name without a value. Such
features evaluate to true if the [=computed value=] is different from the [=initial=]
value for the given [=property=].
A [=style feature=] without a value evaluates to true if the [=computed value=]
is different from the [=initial=] value for the given [=property=].

The boolean syntax and logic combining [=style features=] into a [=container style query|style query=]
is the same as for [=CSS feature queries=].
Expand Down