[css-values-4] Incorporated feedback regarding value and phrasing

Author: SebastianZ

css-grid-1/Overview.bs

@@ -1511,7 +1511,7 @@ Explicit Track Sizing: the 'grid-template-rows' and 'grid-template-columns' prop
 
 		<dfn>&lt;track-size></dfn>          = <<track-breadth>> | minmax( <<inflexible-breadth>> , <<track-breadth>> ) | fit-content( <<length-percentage [0,∞]>> )
 		<dfn>&lt;fixed-size></dfn>          = <<fixed-breadth>> | minmax( <<fixed-breadth>> , <<track-breadth>> ) | minmax( <<inflexible-breadth>> , <<fixed-breadth>> )
-		<dfn>&lt;track-breadth></dfn>       = <<length-percentage [0,∞]>> | <<fraction [0,∞]>> | min-content | max-content | auto
+		<dfn>&lt;track-breadth></dfn>       = <<length-percentage [0,∞]>> | <<fraction>> | min-content | max-content | auto
 		<dfn>&lt;inflexible-breadth></dfn>  = <<length-percentage [0,∞]>> | min-content | max-content | auto
 		<dfn>&lt;fixed-breadth></dfn>       = <<length-percentage [0,∞]>>
 		<dfn>&lt;line-names></dfn>          = '[' <<custom-ident>>* ']'
@@ -1540,7 +1540,7 @@ Track Sizes</h4>
 			and then resolve against that resulting <a>grid container</a> size
 			for the purpose of laying out the <a>grid</a> and its items.
 
-		<dt><dfn><<fraction [0,∞]>></dfn>
+		<dt><dfn><<fraction>></dfn>
 		<dd>
 			Specifies the track's <dfn dfn noexport>flex factor</dfn>.
 			Each <<fraction>>-sized track takes a share of the remaining space in proportion to its <a>flex factor</a>.
@@ -1873,7 +1873,7 @@ Flexible Tracks</h4>
 	which is then divided among the flex-sized rows and columns in proportion to their <a>flex factor</a>.
 
 	Each column or row's share of the <a>leftover space</a> can be computed as the column or row's
-	<code>&lt;flex> * &lt;leftover space> / &lt;sum of all <a>flex factors</a>&gt;</code>.
+	<code>&lt;fraction> * &lt;leftover space> / &lt;sum of all <a>flex factors</a>&gt;</code>.
 
 	When the available space is infinite
 	(which happens when the <a>grid container</a>’s width or height is <a>indefinite</a>),
@@ -4859,7 +4859,7 @@ Changes since the <a href="https://www.w3.org/TR/2020/CRD-css-grid-1-20201218/">
 			</blockquote>
 
 		<li id="change-2020-fr-unit">
-			Moved the definition of <<fraction>> to [[css-values-4#fractions]],
+			Renamed <<flex>> to <<fraction>> and moved its definition to [[css-values-4#fractions]],
 			as other specs also make use of it.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/8027">Issue 8027</a>)
 	</ul>

css-grid-1/issues-cr-2016.html

@@ -292,7 +292,7 @@ <h1>CSS Grid Layout Level 1 Disposition of Comments for 2016-09-29 CR</h1>
 <span>Resolved: <a href='https://lists.w3.org/Archives/Public/www-style/2017Apr/0018.html'>https://lists.w3.org/Archives/Public/www-style/2017Apr/0018.html</a> <a href="https://www.w3.org/Mail/flatten/index?subject=https%3A%2F%2Flists.w3.org%2FArchives%2FPublic%2Fwww-style/2017Apr/0018.html"><abbr title="Thread">&#x2208;</abbr></a></span></pre>
 <pre class=' a' id='issue-32'>
 <span>Issue 32. <a href='#issue-32'>#</a></span>
-<span>Summary:  Computed value for single value &lt;flex>?</span>
+<span>Summary:  Computed value for single value &lt;fraction>?</span>
 <span>From:     Mats Palmgren</span>
 <span>Comment:  <a href='https://github.com/w3c/csswg-drafts/issues/529'>https://github.com/w3c/csswg-drafts/issues/529</a></span>
 <span>Response: <a href='https://github.com/w3c/csswg-drafts/issues/529#issuecomment-251841937'>https://github.com/w3c/csswg-drafts/issues/529#issuecomment-251841937</a></span>

css-grid-2/Overview.bs

@@ -1595,7 +1595,7 @@ Explicit Track Sizing: the 'grid-template-rows' and 'grid-template-columns' prop
 		<dfn>&lt;line-name-list></dfn>      = [ <<line-names>> | <<name-repeat>> ]+
 		<dfn>&lt;track-size></dfn>          = <<track-breadth>> | minmax( <<inflexible-breadth>> , <<track-breadth>> ) | fit-content( <<length-percentage [0,∞]>> )
 		<dfn>&lt;fixed-size></dfn>          = <<fixed-breadth>> | minmax( <<fixed-breadth>> , <<track-breadth>> ) | minmax( <<inflexible-breadth>> , <<fixed-breadth>> )
-		<dfn>&lt;track-breadth></dfn>       = <<length-percentage [0,∞]>> | <<fraction [0,∞]>> | min-content | max-content | auto
+		<dfn>&lt;track-breadth></dfn>       = <<length-percentage [0,∞]>> | <<fraction>> | min-content | max-content | auto
 		<dfn>&lt;inflexible-breadth></dfn>  = <<length-percentage [0,∞]>> | min-content | max-content | auto
 		<dfn>&lt;fixed-breadth></dfn>       = <<length-percentage [0,∞]>>
 		<dfn>&lt;line-names></dfn>          = '[' <<custom-ident>>* ']'
@@ -1624,7 +1624,7 @@ Track Sizes</h4>
 			and then resolve against that resulting <a>grid container</a> size
 			for the purpose of laying out the <a>grid</a> and its items.
 
-		<dt><dfn><<fraction [0,∞]>></dfn>
+		<dt><dfn><<fraction>></dfn>
 		<dd>
 			A non-negative dimension with the unit ''fr'' specifying the track's <dfn dfn noexport>flex factor</dfn>.
 			Each <<fraction>>-sized track takes a share of the remaining space in proportion to its <a>flex factor</a>.
@@ -1963,7 +1963,7 @@ Flexible Tracks</h4>
 	which is then divided among the flex-sized rows and columns in proportion to their <a>flex factor</a>.
 
 	Each column or row's share of the <a>leftover space</a> can be computed as the column or row's
-	<code>&lt;flex> * &lt;leftover space> / &lt;sum of all <a>flex factors</a>&gt;</code>.
+	<code>&lt;fraction> * &lt;leftover space> / &lt;sum of all <a>flex factors</a>&gt;</code>.
 
 	When the available space is infinite
 	(which happens when the <a>grid container</a>’s width or height is <a>indefinite</a>),
@@ -5461,7 +5461,7 @@ Changes since the <a href="https://www.w3.org/TR/2020/CRD-css-grid-2-20201218/">
 			</blockquote>
 
 		<li id="change-2020-fr-unit">
-			Moved the definition of <<fraction>> to [[css-values-4#fractions]],
+			Renamed <<flex>> to <<fraction>> and moved its definition to [[css-values-4#fractions]],
 			as other specs also make use of it.
 			(<a href="https://github.com/w3c/csswg-drafts/issues/8027">Issue 8027</a>)
 	</ul>

css-values-4/Overview.bs

@@ -2931,19 +2931,24 @@ Combination of <<position>></h4>
 <h3 id="fractions">
 Flexible lengths: the <<fraction>> type</h3>
 
-	Fraction values are non-negative <<dimension>>s denoted by
-	<dfn id="flex-value">&lt;flex></dfn>.
-	The unit identifier is <dfn value for="<flex>" lt="fr|fr unit">fr</dfn>.
+	Fraction values are denoted by <dfn id="flex-value">&lt;fraction></dfn>,
+	and indicate a value that is some fraction of another reference value.
+	A fraction is a <<dimension>>.
+	Its unit identifier is <dfn value for="<flex>" lt="fr|fr unit">fr</dfn>.
 
 	These values specify
 	<dfn export lt="flexible length">flexible lengths</dfn>.
 	Each length defines a portion of a given space
 	which is specified by the context the type is used in.
 
+	The allowed range of <<fraction>>> values
+	<em>always</em> excludes negative values,
+	in addition to any explicit ranges that might be specified.
+
 	Note: <<fraction>> values are not <<length>>s
 	(nor are they compatible with <<length>>s, like some <<percentage>> values),
 	so they cannot be represented in or
-	combined with other unit typesin ''calc()'' expressions.
+	combined with other unit types in ''calc()'' expressions.
 
 	<details class=note>
 		<summary><<fraction>> values between 0fr and 1fr have a somewhat special behavior:
@@ -2982,10 +2987,6 @@ Flexible lengths: the <<fraction>> type</h3>
 		if fractions are added or removed.
 	</details>
 
-	Note: <<fraction>> values are not <<length>>s
-	(nor are they compatible with <<length>>s, like some <<percentage>> values),
-	so they cannot be represented in or combined with other unit types in ''calc()'' expressions.
-
 
 <!--
 ████████ ██     ██ ██    ██  ██████   ██████