[whatwg] [wf2] repetition model addition step 14 issue

[Rikkert Koppes]

Related is the movement of repetition blocks, section 3.6.3 step 3: 
http://www.whatwg.org/specs/web-forms/current-work/#movement
---
# If distance is negative: while distance is not zero and target's 
|previousSibling| is defined and is not a repetition template 
<http://www.whatwg.org/specs/web-forms/current-work/#repetition2>, set 
target to this |previousSibling| and, if it is a repetition block 
<http://www.whatwg.org/specs/web-forms/current-work/#repetition3>, 
increase distance by one (make it less negative by one).
---
blocks might move above previous siblings that are not repetition blocks 
(picture a legend element).

Regards,
Rikkert Koppes

Rikkert Koppes schreef:
> the addition sequence, step 14 states 
> (http://www.whatwg.org/specs/web-forms/current-work/#addition):
> ---
> If the first argument to the method was null, then the template once 
> again crawls through its previous siblings, this time stopping at the 
> first node (possibly the template itself) whose previous sibling is a 
> repetition block (regardless of what that block's template is) or the 
> first node that has no previous sibling, whichever comes first. The 
> new element is the inserted into the parent of the template, 
> immediately before that node. Mutation events are fired if appropriate.
> ---
>
> Furthermore, as I interpret correctly, this is also the case at 
> initialisation, i.e. the addRepetitionBlock() method is invoked with 
> null as it's argument 
> (http://www.whatwg.org/specs/web-forms/current-work/#initial). (not 
> quite sure whether this is indeed correct interpreted, see further)
> ---
> For each element that has a |repeat 
> <http://www.whatwg.org/specs/web-forms/current-work/#repeat>| 
> attribute with the literal value |template 
> <http://www.whatwg.org/specs/web-forms/current-work/#template>|, the 
> UA must invoke the template's replication behaviour as many times as 
> the |repeat-start 
> <http://www.whatwg.org/specs/web-forms/current-work/#repeat-start>| 
> attribute on the same element specifies (just once, if the attribute 
> is missing or has an invalid value).[...] (Invoking the template's 
> replication behaviour means calling its |addRepetitionBlock() 
> <http://www.whatwg.org/specs/web-forms/current-work/#addrepetitionblock>| 
> method).
> ---
>
> If this is the case, at initialisation, when there are no repetition 
> blocks, the first block is added as the very first child of the 
> template's parent, which is not necessarily before the template. This 
> doesn't seems to be desired very often. Picture a fieldset with a 
> legend where the first replicated block ends up before the legend. 
> Should the initial replication behaviour maybe call the 
> addRepetitionBlock with the template's previous sibling as argument?
>
> Regards,
> Rikkert Koppes