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Feedback from Alex Chiculita, Adobe: ==== We have Region.getRegionFlowRanges that returns the Range[] array while there is no way to get all the regions of a specific range. For example, there's no NamedFlow.getRegionsByFragmentRange(). There's only NamedFlow.getRegionsByContentNode() . I'm not sure if it's needed, but it feels like it should go both ways. ===
use case proposed by Alex: == Could be used for detecting what regions are affected by the user selection. For example: the user selects some text and you might need to highlight the selected regions or show a contextual menu near the regions. ==
Added as a possible future feature: http://wiki.csswg.org/spec/css-regions-4