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[css-anchor-1] Allow anchoring to abspos anchors #8779

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merged 1 commit into from
May 4, 2023
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[css-anchor-1] Allow anchoring to abspos anchors #8779

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39 changes: 11 additions & 28 deletions css-anchor-position-1/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -611,37 +611,20 @@ might not be capable of anchoring the positioned element.
<div algorithm="acceptable anchor element">
An element |el| is a <dfn export>acceptable anchor element</dfn>
for an [=absolutely positioned=] element |query el|
if any of the following are true:
if all of the following are true:

* |query el| is in a higher [=root layer=] than |el|.
* Either |el| is a descendant of |query el|'s [=containing block=],
or |query el|'s [=containing block=] is the [=initial containing block=].

* |query el| and |el| are in the same [=root layer=],
and all of the following are true:
* If |el| has the same [=containing block=] as |query el|,
then either |el| is not [=absolutely positioned=],
or |el| precedes |query el| in the tree order.

* Either |el| is a descendant of |query el|'s [=containing block=],
or |query el|'s [=containing block=] is the [=initial containing block=].

* If |el| has the same [=containing block=] as |query el|,
|el| is not [=absolutely positioned=].

* If |el| has a different [=containing block=] from |query el|,
the last [=containing block=] in |el|'s [=containing block chain=]
before reaching |query el|'s [=containing block=]
is not [=absolutely positioned=].

For the purposes of this algorithm,
an element is in a particular <dfn noexport>root layer</dfn>
corresponding to the closest [=inclusive ancestor=]
that is in the [=top layer=],
or the document if there isn't one.
[=Root layers=] are "higher" if their corresponding element
is later in the [=top layer=] list;
the layer corresponding to the document is lower than all other layers.

Note: This wording around "root layer"
needs to live in a stacking-context spec,
after pulling the [=top layer=] stuff
out of [[fullscreen]].
* If |el| has a different [=containing block=] from |query el|,
then the last [=containing block=] in |el|'s [=containing block chain=]
before reaching |query el|'s [=containing block=]
is either not [=absolutely positioned=]
or precedes |query el| in the tree order.
</div>

An element can also have an <dfn export>implicit anchor element</dfn>,
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