grid-template-columns gives error in Dreamweaver

[Yerrun]

In my css file I have 

@media (min-width: 768px) {
	.cards { grid-template-columns: repeat(4, 1fr); }
}

and I get an error saying

Expected RBRACE

I got the code from https://travishorn.com/responsive-grid-in-2-minutes-with-css-grid-layout-4842a41420fe and all is working as expected. 

Why is there an error?  

[BenPleysier · Accepted solution]

Because Dreamweaver linting is behind the times. Ignore the error or turn off linting.

[Yerrun]

Thank you for your answer, Ben.

I've looked at Linting. If possible I don't want to turn it off for css completely. 

Do you know if I can add a rule to turn this one only?

[Jon Fritz]

I haven't found a way to kill that error specifically. DW just doesn't understand "fr" yet. 

Hopefully in the next release. Or use the online validation tool instead: https://jigsaw.w3.org/css-validator/

[Yerrun]

Thank you for reminding me of the link. Bit of a waste of time that DW isn't up-to-date coz I've spent quite some time on this.

[osgood_]

Dont place too much dependency on validatimg code within an editor - from experience l can inform you theres not one  single editor alive and kicking that is 100% accurate, they all get something wrong somewhere or miss something obvious.

Just use validators as a guide, you know what you have written is valid so move on, validators will flag up stuff you sometimes mistype/overlook so look upon them as being helpful rather than accurate in their interpretation.

Validation these days is a thing of the past, even the 'official' validator gets it all wrong particularly as many good developers use advanced front end frameworks which it does not recognise.