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[css-lists] Fix reversed counters to count how many elements increment or set the counter #6297

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Jun 15, 2021
Merged

[css-lists] Fix reversed counters to count how many elements increment or set the counter #6297

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[css-lists] Fix reversed counters to count how many elements incremen…
zcorpan May 19, 2021
6a1619e
Handle counter-increments other than -1 better and handle counter-set…
zcorpan Jun 15, 2021
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24 changes: 23 additions & 1 deletion css-lists-3/Overview.bs
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Expand Up @@ -1142,7 +1142,29 @@ Instantiating Counters</h4>

When a [=counter=] is [=instantiated=] without an initial value,
the user agent must dynamically calculate the initial value at layout-time
to be the number of elements and pseudo-elements that [=instantiate=] the same counter in the same [=scope=], plus 1.
to be the value returned by the following algorithm:

1. Let |num| be 0.

2. Let |first| be true.

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.

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|.

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

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