[css-contain] columns and grid affect size-contained elements

Closes #2804

css-contain-1/Overview.bs

@@ -33,6 +33,8 @@ spec:css2; type:dfn; text:stacking context
 spec:css2; type:property; text:content
 spec:css-display-3; type:property; text:display
 spec:css2; type:property; text:counter-increment
+spec:css-ui-3; type:property; text:text-overflow
+spec:css-grid-1; type:property; text:grid
 </pre>
 <h2 id='intro'>
 Introduction</h2>
@@ -187,6 +189,12 @@ Size Containment</h3>
 	1. When laying out the containing element,
 		it must be treated as having no contents.
 
+		Note: Even when the element's [=sizing properties=] are ''height/auto''
+		this does not necessarily make the element zero-sized:
+		properties set on the element itself,
+		such as the 'columns' property or the 'grid' property,
+		continue to be taken into account.
+
 		After layout of the element is complete,
 		its contents must then be laid out into the containing element's resolved size.
 
@@ -458,6 +466,7 @@ This appendix is <em>informative</em>.
 <a href="https://www.w3.org/TR/2018/CR-css-contain-1-20180524/">Candidate Recommendation of 24 May 2018</a></h3>
 
 * Size containment does not apply to tables
+* Clarify that the columns and grid properties affect the size of size-contained elements
 
 <h3 id="2017-08-08-changes">Changes from the
 <a href="https://www.w3.org/TR/2017/CR-css-contain-1-20170808/">Candidate Recommendation of 8 August 2017</a></h3>

css-contain-1/issues-2018-cr.html

@@ -40,6 +40,16 @@ <h1>CSS Contain Level 1 Disposition of Comments for 2018-05-24 CR</h1>
 Response: <a href='https://github.com/w3c/csswg-drafts/issues/2746#issuecomment-395256815'>https://github.com/w3c/csswg-drafts/issues/2746#issuecomment-395256815</a>
 Closed: Accepted
 Resolved: <a href='https://github.com/w3c/csswg-drafts/issues/2746#issuecomment-397009331'>https://github.com/w3c/csswg-drafts/issues/2746#issuecomment-397009331</a></pre>
+<pre class='a' id='issue-2'>
+Issue 2. <a href='#issue-2'>#</a>
+Summary:  specified column/row sizes on grid containers should contribute to contain:size
+From:     Morgan Rae Reschenberg
+Comment:  <a href='https://github.com/w3c/csswg-drafts/issues/2804'>https://github.com/w3c/csswg-drafts/issues/2804</a>
+Response:  <a href='https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-399291965'>https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-399291965</a>
+Comment:  <a href='https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-399585146'>https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-399585146</a>
+Response: <a href='https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-400243568'>https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-400243568</a>
+Closed:   Accepted / Editorial
+Resolved: <a href='https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-402574020'>https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-402574020</a></pre>
 <script>
 (function () {
     var sheet = document.styleSheets[0];

css-contain-1/issues-2018-cr.txt

@@ -8,5 +8,15 @@ From:     Morgan Rae Reschenberg
 Comment:  https://github.com/w3c/csswg-drafts/issues/2746
 Comment:  https://github.com/w3c/csswg-drafts/issues/2746#issuecomment-395242022
 Response: https://github.com/w3c/csswg-drafts/issues/2746#issuecomment-395256815
-Closed: Accepted
+Closed:   Accepted
 Resolved: https://github.com/w3c/csswg-drafts/issues/2746#issuecomment-397009331
+----
+Issue 2.
+Summary:  specified column/row sizes on grid containers should contribute to contain:size
+From:     Morgan Rae Reschenberg
+Comment:  https://github.com/w3c/csswg-drafts/issues/2804
+Response:  https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-399291965
+Comment:  https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-399585146
+Response: https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-400243568
+Closed:   Accepted / Editorial
+Resolved: https://github.com/w3c/csswg-drafts/issues/2804#issuecomment-402574020