> On May 6, 2015, at 2:39 PM, Elliott Sprehn <espr...@chromium.org> wrote: > > The 3 proposal is what the houdini effort is already researching for custom > style/layout/paint. I don't think it's acceptable to make all usage of Shadow > DOM break when used with libraries that read layout information today, ie. > offsetTop must work. I also don't think it's acceptable to introduce new > synchronous hooks and promote n^2 churn in the distribution.
Sorry, I don't follow. If we're making offsetTop to synchronously return the correct value, then authors can easily write code that performs in Ω(n^2) by obtaining the value of offsetTop between adding/removing direct children of a shadow host. On the other hand, if we're trying to prevent O(n^2) behavior, then we should be adding API to asynchronously retrieve layout information. - R. Niwa
