RE: [css-regions] Comments on extract-list-items-013.html (+others)

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Hi,
 
I've managed to try my css-regions polyfill on a first w3c test, and I already face a disagreement between mine and webkit's implementation... Not sure if it's good news or not :-)
 
Basically, the issue arises when you put in a named flows orphaned <LI> items. My implementation (w3test/extract-list-items-013.html) and reference (w3tests/extract-list-items-013-ref.html) both agrees that the markers of the <LI> elements should be inside the parent region, with no prior margin.
 
However, in webkit (w3tests/extract-list-items-013-webkit.html) and in the test suite reference (w3tests/extract-list-items-013-ref-2.html), the markers are outside the region. 
 
To achieve this result in the reference, a special <OL style="padding:0; margin:0"> element was introduced between the region and the orphaned <LI>s. Can someone point me to the relevant parts of the CSS Regions spec (or any other spec) that covers the insertion of a virual OL element, and what's his rationale?
 
Thanks,
François