[css-position-4] Linking fixes, update doc

Author: fantasai

css-position-4/Overview.bs

@@ -1,7 +1,6 @@
 <pre class='metadata'>
 Title: CSS Positioned Layout Module Level 4
 Status: ED
-Prepare for TR: no
 Work Status: Exploring
 Shortname: css-position
 Level: 4
@@ -99,7 +98,7 @@ one of three possible [=containing blocks=] are used:
 
 	The [=scrollable containing block=] established by the document
 	is the union of the [=initial containing block=] and
-	the [=margin box=] of the [=root box=] itself.
+	the [=margin box=] of the [=root element=]'s generated [=box=].
 
 Note: While all of these are in some sense corresponding to the [=padding box=],
 they do not coincide for boxes with [=scrollable overflow=].
@@ -111,7 +110,7 @@ specific to their layer.
 Unless otherwise specified,
 absolutely positioned boxes use the [=local containing block=].
 Certain CSS features can specify a different [=containing block=].
-For example, [=fixed positioned boxes=] typically use the document’s [=fixed containing block=],
+For example, [=fixed-positioned boxes=] typically use the document’s [=fixed containing block=],
 and 'position-area' values other than ''position-area/none''
 can opt absolutely positioned boxes into the [=scrollable containing block=].
 
@@ -146,7 +145,7 @@ the last element in the [=Document/top layer=] is rendered on top of everything
 Note: This special rendering behavior ensures
 that elements in the [=Document/top layer=] cannot be clipped by anything in the document,
 or obscured by anything except elements later in the [=Document/top layer=].
-This ensures that things like [=popovers=]
+This ensures that things like [[HTML#the-popover-attribute|popovers]]
 can be displayed reliably,
 regardless of what their ancestor elements might be doing.
 
@@ -755,6 +754,13 @@ It is recommended that UAs use [=out-of-band outlines=],
 as making outlines easily visible
 is an important accessibility feature.
 
+Changes {#changes}
+=======
+
+Significant changes since the <a href="https://www.w3.org/TR/2025/WD-css-position-4-20250708/">8 July 2025 First Public Working Draft</a>:
+
+* None (markup and linking fixes only).
+
 <h2 class=no-num id=privacy>Privacy Considerations</h2>
 
 No new privacy considerations have been reported on this specification.