[css-anchor-position] Rename anchor-default to position-anchor. w3c#10004

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -81,7 +81,7 @@ This can be done with the following CSS:
 
 		/* All the anchoring behavior will default to
 		   referring to the --tooltip anchor. */
-		anchor-default: --tooltip;
+		position-anchor: --tooltip;
 
 		/* Align the tooltip's bottom to the top of the anchor;
 		   this also defaults to horizontally center-aligning
@@ -247,7 +247,7 @@ This property has no effect on [=implicit anchor elements=].
 		}
 		li .positioned {
 			position: absolute;
-			anchor-default: --list-item;
+			position-anchor: --list-item;
 			inset-area: inline-start;
 		}
 	</pre>
@@ -384,19 +384,19 @@ or nothing (a missing specifier).
 ████▌  █████▌ █▌     █▌  █▌  ███▌  █████   █▌  
 -->
 
-<h3 id=anchor-default>
-Default Anchors: the 'anchor-default' property</h3>
+<h3 id=position-anchor>
+Default Anchors: the 'position-anchor' property</h3>
 
 <pre class=propdef>
-Name: anchor-default
+Name: position-anchor
 Value: <<anchor-element>>
 Initial: implicit
 Applies to: [=absolutely positioned=] elements
 Inherited: no
 Animation type: discrete
 </pre>
 
-The 'anchor-default' property defines the <dfn>default anchor specifier</dfn>
+The 'position-anchor' property defines the <dfn>default anchor specifier</dfn>
 for all [=anchor functions=] on the element,
 allowing multiple elements to use the same set of [=anchor functions=]
 (and [=position options lists=]!)
@@ -425,10 +425,10 @@ in ''anchor()'' and ''anchor-size()''.
 	}
 
 	.foo.anchored {
-		anchor-default: --foo;
+		position-anchor: --foo;
 	}
 	.bar.anchored {
-		anchor-default: --bar;
+		position-anchor: --bar;
 	}
 	</pre>
 </div>
@@ -1260,7 +1260,7 @@ the [=position options list=] will be tried.
 	.anchor { anchor-name: --foo; }
 	.list {
 		position: fixed;
-		anchor-default: --foo;
+		position-anchor: --foo;
 		top: anchor(bottom);
 		left: anchor(left);
 		align-self: start;
@@ -1403,7 +1403,7 @@ the following [=properties=]:
 * [=margin properties=]
 * [=sizing properties=]
 * [=self-alignment properties=]
-* 'anchor-default'
+* 'position-anchor'
 * 'inset-area'
 
 Issue(#9195): What exactly are the constraints that determine what's allowed here?
@@ -1426,7 +1426,7 @@ Note: If multiple elements using different anchors
 want to use the same fallback positioning,
 just relative to their own anchor elements,
 omit the <<anchor-element>> in ''anchor()''
-and specify each element's anchor in 'anchor-default' instead.
+and specify each element's anchor in 'position-anchor' instead.
 
 Note: The most common types of fallback positioning
 (putting the positioned element on one side of the anchor normally,