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[css-lists-3] Update algorithm for initial counter in reversed list #13513

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Merged
tabatkins merged 1 commit into from
Mar 3, 2026
Merged

[css-lists-3] Update algorithm for initial counter in reversed list #13513

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11 changes: 6 additions & 5 deletions css-lists-3/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1148,25 +1148,26 @@ Instantiating Counters</h4>

1. Let |num| be 0.

2. Let |first| be true.
2. Let |lastNonZeroIncrementNegated| be 0.

3. For each element or pseudo-element |el| that increments or
sets the same counter in the same [=scope=]:

1. Let |incrementNegated| be |el|'s 'counter-increment' integer value for this counter,
multiplied by -1.

2. If |first| is true,
then add |incrementNegated| to |num| and
set |first| to false.
2. If |incrementNegated| is not zero,
then set |lastNonZeroIncrementNegated| to |incrementNegated|.

3. If |el| sets this counter with 'counter-set',
then add that integer value to |num| and
break this loop.

4. Add |incrementNegated| to |num|.

4. Return |num|.
4. Add |lastNonZeroIncrementNegated| to |num|.

5. Return |num|.

Note: Only [=reversed=] counters can be instantiated without an initial value.

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