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[css-values-4] Properly handle simplification of sum nodes containing negated sum nodes #13020 #13069

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[css-values-4] Properly handle simplification of sum nodes containing negated sum nodes #13020 #13069

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[css-values-4] Remove erroneous </a> tag
Calme1709 Nov 5, 2025
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[css-values-4] Properly handle simplification of sum nodes containing…
Calme1709 Nov 5, 2025
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25 changes: 23 additions & 2 deletions css-values-4/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1153,7 +1153,7 @@ URL Processing Model</h4>
1. If |cssRuleOrDeclaration| is a [=CSS declaration block=] whose [=parent CSS rule=] is not null,
set |cssRuleOrDeclaration| to |cssRuleOrDeclaration|'s [=parent CSS rule=].

1. If |cssRuleOrDeclaration| is a [=CSS rule=], set |sheet| to |cssRuleOrDeclaration|'s {{CSSRule/parentStyleSheet|parent style sheet}}</a>.
1. If |cssRuleOrDeclaration| is a [=CSS rule=], set |sheet| to |cssRuleOrDeclaration|'s {{CSSRule/parentStyleSheet|parent style sheet}}.

1. If |sheet| is not null:
1. If |sheet|'s <a spec=cssom>stylesheet base URL</a> is not null,
Expand Down Expand Up @@ -4906,7 +4906,28 @@ Simplification</h4>
(0 - value).
2. If |root|'s child is a Negate node,
return the child's child.
3. Return |root|.
3. If |root|'s child is a Sum node:

1. Let |negated grandchildren| be an empty list

2. For each |grandchild| of the child's children:

1. If |grandchild| is a numeric value,
create an equivalent numeric value,
but with the value negated
(0 - value),
and append the result to |negated grandchildren|.

2. If |grandchild| is a Negate node
append |grandchild|'s child to |negated grandchildren|

3. Otherwise,
create a Negate node with |grandchild| as its child,
and append the result to |negated grandchildren|

3. Return a Sum node with |negated grandchildren| as its children

4. Return |root|.

7. If |root| is an Invert node:

Expand Down