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[css-conditional-5] Use the generic <boolean-expr> #12640

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[css-conditional-5] Use the generic <boolean-expr> #12640

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23 changes: 3 additions & 20 deletions css-conditional-5/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -161,28 +161,11 @@ Generalized Conditional Rules: the ''@when'' rule</h2>
It is defined as:

<pre class=prod>
@when <<boolean-condition>> {
@when <<boolean-expr[ <<if-test>> ]>> {
<<rule-list>>
}
</pre>

Where <dfn><<boolean-condition>></dfn> is a boolean algebra a la [[mediaqueries-4#mq-syntax]],
but with ''media()'' and ''supports()'' functions as leaves.

Issue: Define "boolean algebra, with X as leaves" in a generic way in Conditional,
so all the conditional rules can reference it directly,
rather than having to redefine boolean algebra on their own.

The ''media()'' and ''supports()'' functions are defined as:

<pre class=prod>
<dfn>media()</dfn> = media( [ <<mf-plain>> | <<mf-boolean>> | <<mf-range>> ] )
<dfn>supports()</dfn> = supports( <<declaration>> )
</pre>

A ''media()'' or ''supports()'' function is associated the boolean result
that its contained condition is associated with.

<h2 id="else-rule">
Chained Conditionals: the ''@else'' rule</h2>

Expand All @@ -209,13 +192,13 @@ Chained Conditionals: the ''@else'' rule</h2>
It is defined as:

<pre class=prod>
@else <<boolean-condition>>? {
@else <<boolean-expr[ <<if-test>> ]>>? {
<<rule-list>>
}
</pre>

''@else'' is interpreted identically to ''@when''.
If its <<boolean-condition>> is omitted,
If its <<boolean-expr>> is omitted,
it's treated as having a condition that's always true.

A <dfn export>conditional rule chain</dfn> is
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