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From https://lists.w3.org/Archives/Public/public-webapps/2015AprJun/0052.html Currently, the spec is not very precise about when distribution happens: "If any condition which affects the distribution result changes, the distribution result must be updated before any use of the distribution result." This results in difficulty for interoperability, as the exact timing of when affects change is hard to reason across browsers. Instead, it needs to define when exactly the distribution algorithm runs. For example, we could have tied it to the timing of style calculation, because distribution algo always runs before style calculation. Is the timing of style calculation specified?
Moved to https://github.com/w3c/webcomponents/issues/73