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[css-env-1] Specify argument grammar for env() function #13642

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Merged
tabatkins merged 2 commits into from
Mar 12, 2026
Merged

[css-env-1] Specify argument grammar for env() function #13642

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93c8ea7
Add argument grammar for env() function
tursunova Mar 12, 2026
5981b8f
Add missing explanation
tursunova Mar 12, 2026
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10 changes: 10 additions & 0 deletions css-env-1/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -291,6 +291,16 @@ use the ''env()'' function:
<dfn function>env()</dfn> = env( <<custom-ident>> <<integer [0,∞]>>*, <<declaration-value>>? )
</pre>

The ''env()'' function's [=argument grammar=] is:

<pre class=prod>
<dfn><<env-args>></dfn> = env( <<declaration-value>>, <<declaration-value>>? )
</pre>

Like ''var()'', a bare comma can be used with nothing following it,
indicating that the second <<declaration-value>> was passed,
just as an empty sequence.

The ''env()'' function can be used in place of any part of a value in any property on any element,
or any part of a value in any descriptor on any [=at-rule=],
and in several other places where CSS values are allowed.
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