[css-position-3] Even better IDs.

Author: tabatkins

css-position-3/Overview.bs

@@ -501,10 +501,9 @@ Box Insets Shorthands: the 'inset-block', 'inset-inline', and 'inset' properties
 	exactly as the 'margin' property does for its longhands.
 
 
-<h3 id="relpos">
+<h3 id="relpos-insets" oldids="relpos">
 Relative Positioning</h3>
 
-
 	For a [=relatively positioned=] box,
 	the [=inset properties=] move the box inward
 	from the respective edge,
@@ -557,7 +556,7 @@ Relative Positioning</h3>
 <!-- End section: Relative positioning	-->
 
 
-<h3 id="stickypos" oldids="sticky-pos">
+<h3 id="stickypos-insets" oldids="sticky-pos">
 Sticky positioning</h3>
 
 	[=Sticky positioning=] is similar to [=relative positioning=]
@@ -617,7 +616,7 @@ Sticky positioning</h3>
 
 <!-- End section: Sticky positioning -->
 
-<h3 id="abspos" oldids="abs-pos">
+<h3 id="abspos-insets" oldids="abs-pos">
 Absolute Positioning</h3>
 
 	For an [=absolutely positioned=] box,
@@ -670,7 +669,7 @@ Absolute Positioning</h3>
 	into this <dfn>inset-modified containing block</dfn>
 	is as described in [[#abspos-layout]].
 
-<h4 id="breaking">
+<h4 id="abspos-breaking" oldids="breaking">
 Fragmenting Absolutely-positioned Elements</h4>
 
 	In paged media, an absolutely positioned element is positioned relative to its
@@ -697,7 +696,7 @@ Fragmenting Absolutely-positioned Elements</h4>
 
 <!-- End section: Absolute positioning -->
 
-<h3 id="fixpos" oldids="fixed-pos">
+<h3 id="fixpos-insets" oldids="fixed-pos">
 Fixed positioning</h3>
 
 	[=Fixed positioning=] is similar to absolute positioning.