[css-anchor-position] Remove anchor-position-bounds (replacing with position-container in Position). w3c#9868

Author: tabatkins

css-anchor-position-1/Overview.bs

@@ -1341,80 +1341,6 @@ with keywords in 'position-try-options',
 without using ''@position-try'' at all.
 
 
-<!-- Big Text: -bounds 
-
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-████▌ █████  █▌  █▌ █▌  █▌ █▌▐█ █▌ █▌  █▌  ███▌ 
-      █▌  █▌ █▌  █▌ █▌  █▌ █▌  ██▌ █▌  █▌     █▌
-      █▌  █▌ █▌  █▌ █▌  █▌ █▌   █▌ █▌  █▌ █▌  █▌
-      ████▌   ███▌   ███▌  █▌   ▐▌ ████▌   ███▌ 
--->
-
-Applying Stronger Fallback Bounds: the 'position-fallback-bounds' property {#fallback-bounds}
---------------------------------------------------------------------------
-
-When an element using [=anchor positioning=]
-is using ''position: absolute'',
-it determines whether or not it's overflowing
-(and thus should try a different fallback position)
-by looking at its (scroll-adjusted) [=inset-modified containing block=].
-By carefully selecting where in the DOM
-the positioned element lives,
-and what element establishes its containing block,
-you can choose a useful element
-to use for its overflow bounds.
-
-When using ''position: fixed'',
-or things like the Popover API
-that use the [=top layer=],
-you lose this ability;
-their containing block is always the viewport
-or the root element's containing block.
-The 'position-fallback-bounds' property
-restores this ability,
-allowing an element to explicitly select
-what element it wants to use
-for checking overflow against.
-
-<pre class=propdef>
-Name: position-fallback-bounds
-Value: normal | <<dashed-ident>>
-Initial: normal
-Applies to: [=absolutely positioned=] elements
-Inherited: no
-Animation type: discrete
-</pre>
-
-<dl dfn-type=value dfn-for=position-fallback-bounds>
-	: <dfn>normal</dfn>
-	:: The element uses its normal (scroll-adjusted, inset-modified) containing block
-		to determine if it's overflowing
-		for the purpose of selecting a [=position options list=] entry.
-
-	: <<dashed-ident>>
-	::
-		In addition to checking overflow against its containing block,
-		as per ''position-fallback-bounds/normal'',
-		the element checks against its <dfn dfn for>additional fallback-bounds rect</dfn>.
-
-		The [=additional fallback-bounds rect=]
-		is the [=padding box=]
-		of the result of determining the [=target anchor element=]
-		given this element and the specified <<dashed-ident>>.
-		If there is no such [=target anchor element=],
-		there is no [=additional fallback-bounds rect=].
-
-		Issue: padding-box? Or content-box? Should it be controllable?
-</dl>
-
-Issue: Or should this just be a more generic CSS Position ability,
-where any abspos can select a specific element as its containing block?
-Presumably still using the 'anchor-name' to specify it,
-and applying the same constraints as described here,
-to ensure proper ordering of layout
-
 
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