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[csswg-drafts] [css-images] Clarify relationship between level 3 and 4 (#5804)

From: Dominique Hazael-Massieux via GitHub <sysbot+gh@w3.org>
Date: Thu, 17 Dec 2020 09:23:03 +0000
To: public-css-archive@w3.org
Message-ID: <issues.opened-769753324-1608196982-sysbot+gh@w3.org>
dontcallmedom has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-images] Clarify relationship between level 3 and 4 ==
CSS Images 4 seems to be described as a superset of CSS Images 3:
> It includes and extends the functionality of CSS level 2 [CSS2] and in the previous level of this specification [css3-images].

Yet, it doesn't seem to be actually a superset, e.g. `object-position` is not included in level 4.

A specific illustration of this is that its list of terms defined by references includes 16 terms from Level 3: circle,  concrete object size,  contain constraint,  cover constraint,  default object size,  default sizing algorithm,  ellipse,  linear-gradient(),  natural aspect ratio,  natural dimension,  natural height,  natural size,  natural width,  object size negotiation,  object-position,  radial-gradient() 

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/5804 using your GitHub account

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