What is `css.at-rules.media.media_query_values` ?

[romainmenke]

added in PR : #3549

There are no specification or documentation links and the naming is ambiguous.
What is this feature?

browser-compat-data/css/at-rules/media.json

Lines 787 to 819 in 10cdcbe

	"media_query_values": {
	"__compat": {
	"description": "Media query value support",
	"support": {
	"chrome": {
	"version_added": "66"
	},
	"chrome_android": "mirror",
	"edge": "mirror",
	"firefox": {
	"version_added": "59"
	},
	"firefox_android": "mirror",
	"ie": {
	"version_added": false
	},
	"oculus": "mirror",
	"opera": "mirror",
	"opera_android": "mirror",
	"safari": {
	"version_added": false
	},
	"safari_ios": "mirror",
	"samsunginternet_android": "mirror",
	"webview_android": "mirror"
	},
	"status": {
	"experimental": false,
	"standard_track": true,
	"deprecated": false
	}
	}
	},

[romainmenke]

If I understand it correctly this refers only to calc() in @media where <number> is allowed.

Can we clarify this somehow?

[romainmenke]

Just found out that browser do not support calc() everywhere <number> is allowed at this time.

So this feature could be split up into sub features or support data could be changed.

see : web-platform-tests/wpt#36889

Update :

calc() does work in <ratio> when calc() is generally supported but the values are clamped when <ratio> only supports <integer>.

<ratio> support is covered elsewhere : #18198

[caugner]

This was actually added in #886, whereas #3549 "only" moved it from css.types.calc to css.at-rules.media.

[janbrasna]

This is a bug from moving the record between calc() and @media (with the description ceasing to make sense in the new context actually omitting it's for calc() support in media queries et al.) basically first adding the calc correctly: 55d6d21 … but then resolving the reviews also moving media_query_values instead of just deleting the original: b5b2f96 which resulted in a duplicate, unmaintained entry.

(I landed here wondering the same; "what does that line/description ought to represent"… and only tracing back the diffs it turned out to be calc()-related.)

Only the actual css.at-rules.media.calc is being updated as in #3977, with css.at-rules.media.media_query_values falling out of sync, partly because nobody really knows what it actually represents today;D

My proposal would be to completely remove css.at-rules.media.media_query_values, as it's an unfortunate dupe of css.at-rules.media.calc.