[css-tables] Fix w3c#1899 by allowing position:relative on all table boxes

Author: FremyCompany

css-tables-3/Overview.bs

@@ -902,10 +902,6 @@ spec:css-sizing-3; type:property; text:box-sizing
 				<li>All css properties of <a>table-column</a> and <a>table-column-group</a> boxes are ignored,
 					except when explicitly specified by this specification.
 
-				<li>The 'position' of <a>table-track</a> and <a>table-track-group</a> boxes is ignored
-					if its value is <code>relative</code>. User agents that support 'transform'
-					still need to support making these boxes containing blocks if required by spec.
-
 				<li>The 'margin', 'padding', 'overflow' and 'z-index' of <a>table-track</a> and <a>table-track-group</a boxes> are ignored.
 
 				<li>The 'margin' of <a>table-cell</a> boxes is ignored (as if it was set to 0px).