[mediaqueries-4][mediaqueries-5] Is <mf-range> syntax correct?

[emilio]

https://drafts.csswg.org/mediaqueries-4/#mq-syntax says:

<mf-range> = <mf-name> [ '<' | '>' ]? '='? <mf-value>
           | <mf-value> [ '<' | '>' ]? '='? <mf-name>

That means that width 500px is a valid production, for example, without any operator, neither = or > / <.

Is this intentional? If so, is it worth a test / clarification?

[emilio]

cc @zcorpan

[emilio]

Err, sorry @zcorpan, meant to mention @frivoal :)

[tabatkins]

Whoops, no, that's not intended. Should be

<mf-range> = <mf-name> [ [ '<' | '>' ]? '='? ]! <mf-value>
           | <mf-value> [ [ '<' | '>' ]? '='? ]! <mf-name>

Or perhaps just replace that middle bit with <mq-comparison>, defined as:

<mq-comparison> = [ '<' | '> ] '='? | '='