[css-anchor-position-1] Rename position-try-options to -fallbacks (#10517)

Resolves #10395.

Author: andruud

css-anchor-position-1/Overview.bs

@@ -1360,7 +1360,7 @@ might result in the positioned element overflowing its [=containing block=]
 or being positioned partially off screen.
 
 To ameliorate this, an [=absolutely positioned=] element
-can use the 'position-try-options' property
+can use the 'position-try-fallbacks' property
 to refer to several variant sets of positioning/alignment properties
 (generated from the element's existing styles,
 or specified in ''@position-try'' rules)
@@ -1375,11 +1375,11 @@ to additional be sorted by the available space they define,
 if it's more important for the element to have as much space as possible
 rather than strictly follow some declared order.
 
-Giving Fallback Options: the 'position-try-options' property {#position-try-options}
+Giving Fallback Options: the 'position-try-fallbacks' property {#position-try-fallbacks}
 --------------------------------
 
 <pre class=propdef>
-Name: position-try-options
+Name: position-try-fallbacks
 Value: none | [ [<<dashed-ident>> || <<try-tactic>>] | <<'inset-area'>> ]#
 Initial: none
 Inherited: no
@@ -1399,7 +1399,7 @@ or a <<try-tactic>> representing an automatic transformation of the element's ex
 
 Values have the following meanings:
 
-<dl dfn-type=value dfn-for=position-try-options>
+<dl dfn-type=value dfn-for=position-try-fallbacks>
 	: <dfn>none</dfn>
 	::
 		The property has no effect;
@@ -1614,7 +1614,7 @@ the [=position options list=] will be tried.
 	: <dfn>normal</dfn>
 	::
 		Try the [=position options=]
-		in the order specified by 'position-try-options'.
+		in the order specified by 'position-try-fallbacks'.
 
 	: <dfn>most-width</dfn>
 	: <dfn>most-height</dfn>
@@ -1646,7 +1646,7 @@ the [=position options list=] will be tried.
 		top: anchor(bottom);
 		left: anchor(left);
 		align-self: start;
-		position-try-options: --bottom-scrollable, flip-block, --top-scrollable;
+		position-try-fallbacks: --bottom-scrollable, flip-block, --top-scrollable;
 		position-try-order: most-height;
 	}
 	@position-try --bottom-scrollable {
@@ -1734,10 +1734,10 @@ The 'position-try' Shorthand {#position-try-prop}
 
 <pre class="propdef shorthand">
 Name: position-try
-Value: <<'position-try-order'>>? <<'position-try-options'>>
+Value: <<'position-try-order'>>? <<'position-try-fallbacks'>>
 </pre>
 
-This shorthand sets both 'position-try-options' and 'position-try-order'.
+This shorthand sets both 'position-try-fallbacks' and 'position-try-order'.
 If <<'position-try-order'>> is omitted,
 it's set to the property's initial value.
 
@@ -1761,7 +1761,7 @@ defines a <dfn>position option</dfn>
 with a given name,
 specifying one or more sets of positioning properties
 that will be applied to an element
-via 'position-try-options',
+via 'position-try-fallbacks',
 
 The syntax of the ''@position-try'' rule is:
 
@@ -1825,7 +1825,7 @@ Note: The most common types of fallback positioning
 (putting the positioned element on one side of the anchor normally,
 but flipping to the opposite side if needed)
 can be done automatically
-with keywords in 'position-try-options',
+with keywords in 'position-try-fallbacks',
 without using ''@position-try'' at all.
 
 
@@ -1958,8 +1958,8 @@ laying out later elements cannot change this decision.
 		remove its [=last successful position option=]:
 
 		* |el| is not an [=absolutely positioned=] element
-		* |el|'s computed value for 'position-try-options' has changed
-		* Any of the ''@position-try'' rules referenced by |el|'s 'position-try-options'
+		* |el|'s computed value for 'position-try-fallbacks' has changed
+		* Any of the ''@position-try'' rules referenced by |el|'s 'position-try-fallbacks'
 			have been added, removed, or mutated.
 
 		Then, [=determine the position fallback styles=] of |el|
@@ -1989,7 +1989,7 @@ This limit must be <em>at least</em> five.
 		position: fixed;
 		top: anchor(--button bottom);
 		left: anchor(--button left);
-		position-try-options: flip-inline, flip-block, flip-block flip-inline;
+		position-try-fallbacks: flip-inline, flip-block, flip-block flip-inline;
 
 		/* The popover is at least as wide as the button */
 		min-width: anchor-size(--button width);