[css-position-3] Clean up terminology in fragmentation section.

Author: fantasai

css-position-3/Overview.bs

@@ -679,24 +679,30 @@ Absolute Positioning</h3>
 <h4 id="abspos-breaking" oldids="breaking">
 Fragmenting Absolutely-positioned Elements</h4>
 
-	In paged media, an absolutely positioned element is positioned relative to its
-	containing block ignoring any page breaks (as if the document were continuous). The
-	element may subsequently be broken over several pages.
-
-	For absolutely positioned content that resolves to a position on a page other than the
-	page being laid out (the current page), or resolves to a position on the current page
-	which has already been rendered for printing, printers may place the content:
+	In a [=fragmented flow=], an [=absolutely positioned box=]
+	is positioned relative to its [=containing block=]
+	ignoring any [=fragmentation breaks=]
+	(as if the flow were continuous).
+	The box may subsequently be broken over several [=fragmentation containers=].
+
+	For absolutely positioned content in [=paged media=]
+	that resolves to a position on a page
+	other than the page being laid out (the current page),
+	or resolves to a position on the current page
+	that has already been rendered for printing,
+	printers may place the content:
 
 	<ul>
-		<li>on the current page,</li>
-		<li>on a subsequent page, or</li>
-		<li>may omit it altogether.</li>
+		<li>on the current page,
+		<li>on a subsequent page, or
+		<li>may omit it altogether.
 	</ul>
 
-	Note: A block-level element that is split over several pages may have a different width
-	on each page and that there may be device-specific limits.
+	Note: A [=block-level=] element that is split over several pages
+	can have a different width on each page,
+	and there may be device-specific limits.
 
-	User agents must not paginate the content of fixed boxes.
+	User agents must not paginate the content of [=fixed-positioned boxes=].
 
 	Note: User agents might print invisible content in other ways.
 	See [[CSS-PAGE-3#content-outside-box]].