[css-grid-1] Switch <positive-integer> to valid css-values syntax. #4479

Author: fantasai

css-grid-1/Overview.bs

@@ -29,7 +29,7 @@ Former editor: Alex Mogilevsky, Microsoft Corporation, alexmog@microsoft.com
 Former editor: Phil Cupp, Microsoft Corporation, pcupp@microsoft.com
 Issue Tracking: Disposition of Comments https://drafts.csswg.org/css-grid-1/issues
 Abstract: This CSS module defines a two-dimensional grid-based layout system, optimized for user interface design. In the grid layout model, the children of a grid container can be positioned into arbitrary slots in a predefined flexible or fixed-size layout grid.
-Ignored Terms: containing block, <positive-integer>, <ident>, auto, grid-*-start, grid-*-end, flex factor, flex factors, block formatting context, grid-auto-position
+Ignored Terms: containing block, <ident>, auto, grid-*-start, grid-*-end, flex factor, flex factors, block formatting context, grid-auto-position
 Ignored Vars: A, B, C, size-contribution, track-sizes, extra-space
 Link Defaults: css2 (property) margin/min-height/max-height/min-width/max-width, css-align-3 (value) stretch/baseline, css-position-3 (property) left, css-position-3 (property) position, css-writing-modes-3 (dfn) start/end
 At Risk: application of grid placement to absolutely-positioned boxes
@@ -1685,7 +1685,7 @@ Syntax of ''repeat()''</h5>
 	The generic form of the ''repeat()'' syntax is, approximately,
 
 	<pre class='prod'>
-		repeat( [ <<positive-integer>> | auto-fill | auto-fit ] , <<track-list>> )
+		repeat( [ <<integer [0,&infin;]>> | auto-fill | auto-fit ] , <<track-list>> )
 	</pre>
 
 	The first argument specifies the number of repetitions.
@@ -1703,9 +1703,9 @@ Syntax of ''repeat()''</h5>
 	has several forms:
 
 	<pre class='prod'>
-		<dfn><<track-repeat>></dfn> = repeat( [ <<positive-integer>> ] , [ <<line-names>>? <<track-size>> ]+ <<line-names>>? )
+		<dfn><<track-repeat>></dfn> = repeat( [ <<integer [0,&infin;]>> ] , [ <<line-names>>? <<track-size>> ]+ <<line-names>>? )
 		<dfn><<auto-repeat>></dfn>  = repeat( [ auto-fill | auto-fit ] , [ <<line-names>>? <<fixed-size>> ]+ <<line-names>>? )
-		<dfn><<fixed-repeat>></dfn> = repeat( [ <<positive-integer>> ] , [ <<line-names>>? <<fixed-size>> ]+ <<line-names>>? )
+		<dfn><<fixed-repeat>></dfn> = repeat( [ <<integer [0,&infin;]>> ] , [ <<line-names>>? <<fixed-size>> ]+ <<line-names>>? )
 	</pre>
 
 	* The <<track-repeat>> variant can represent the repetition of any <<track-size>>,