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[css-anchor-position-1][editorial] Clarify validity of anchor-*() #11931

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[css-anchor-position-1][editorial] Clarify validity of anchor-*() #11931

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9 changes: 4 additions & 5 deletions css-anchor-position-1/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1251,8 +1251,7 @@ An ''anchor()'' function is a
<dfn lt="valid anchor function|invalid anchor function">valid anchor function</dfn>
only if all the following conditions are true:

* It's being used in an [=inset property=]
on an [=absolutely positioned box=].
* It's being used on an [=absolutely positioned box=].
* If its <<anchor-side>> specifies a physical keyword,
it's being used in an [=inset property=] in that axis.
(For example, ''anchor()/left'' can only be used in 'left', 'right',
Expand Down Expand Up @@ -1401,6 +1400,8 @@ Name: width, height, min-width, min-height, max-width, max-height, top, left, ri
New values: <<anchor-size()>>
</pre>

<div class=note>These are the [=accepted @position-try properties=] that allow lengths.</div>

<pre class=prod>
anchor-size() = anchor-size( [ <<anchor-name>> || <<anchor-size>> ]? , <<length-percentage>>? )
<dfn><<anchor-size>></dfn> = width | height | block | inline | self-block | self-inline
Expand Down Expand Up @@ -1452,9 +1453,7 @@ An ''anchor-size()'' function is a
<dfn lt="valid anchor-size function|invalid anchor-size function">valid anchor-size function</dfn>
only if all the following conditions are true:

* It's being used in a [=sizing property=], an [=inset property=], or a [=margin property=]
on an [=absolutely positioned box=].
<span class=note>(These are the [=accepted @position-try properties=] that allow lengths.)</span>
* It's being used on an [=absolutely positioned box=].
* There is a [=target anchor element=]
for the box it's used on,
and the <<anchor-name>> value specified in the function.
Expand Down