[css-conditional-3] Allowing semicolons

[svgeesus]

@SimonSapin wrote on www-style in 2013

Le 25/08/2013 21:36, Tab Atkins Jr. a écrit :
On Sun, Aug 25, 2013 at 1:08 PM, Simon Sapin simon.sapin@exyr.org wrote:
Le 25/08/2013 08:01, Cameron McCormack a écrit :

 @supports (var-a: abc;)               { ... fails ... }

This one should be the same as

@supports (color: green;)

What do we want these to do?

Yes, it is - note the equivalent statement without the semicolon in
the "passes" section of his email.

Per the Conditional spec's grammar, having a semicolon at the end is invalid.

Yes, this is what I’m reading from the spec as well, but I seem to
remember F2F discussions where dbaron wanted this to be valid because
people might just add the semi-colon by habit. Or did I make this up?

[tabatkins]

This is tested in https://wpt.fyi/results/css/css-conditional/at-supports-038.html?label=experimental&label=master&aligned and everyone passes the current text (disallowing ; in a supports condition), so I don't think we should change anything.

[svgeesus]

Thanks, Tab. I agree that if it is already interoperable we should not change anything.