[css-tables] Clarify that the bounding-box-assignment section applies to offset* properties

Author: FremyCompany

css-tables-3/Overview.bs

@@ -2363,6 +2363,9 @@ spec:css-sizing-3; type:property; text:box-sizing
 		Once the width of each column and the height of each row of the table grid has been determined,
 			the final step of algorithm is to assign to each table-internal box its final position.
 
+		The width/height/left/top calculated below define the dimensions of the CSS Layout Box, 
+			which means that they are accessible via the <a href="https://drafts.csswg.org/cssom-view/#extensions-to-the-htmlelement-interface">offset* properties</a> defined in CSSOM-VIEW.
+
 		The <a>table-wrapper</a> box is then sized such that
 			it contains the margin box of all <a>table-non-root</a> boxes
 			as well as the <a>table-root</a> border-box.
@@ -2409,6 +2412,14 @@ spec:css-sizing-3; type:property; text:box-sizing
 				and a table-column-group is considered to span all the rows.
 		</div>
 
+		<div class="note">
+			The above formula take in account 'border-spacing', and it might not be directly obvious what the effect of these mean, so here are a couple of properties of those formula:
+			<ul>
+				<li> the border-spacing before the first track or after the last track in a direction is not included in any track's or track-group's breadth. 
+				<li> the border-spacing between tracks is not included in any track's breadth, but is included in the breadth of track-groups spanning both tracks. 
+			</ul>
+		</div>
+
 		The <b>position of any table-caption having "bottom" as 'caption-side'</b> within the table is defined as the rectangle whose:
 
 		<ul class="compact">