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CSS3 module "Generated Content for Paged Media" and especially the target-counter function #1510
Current status: https://www.chromestatus.com/feature/5400251359821824 (not implemented anywhere)
Another category that should be added site-wide is EPUB/MOBI renderers (since it's all just HTML & CSS in the end). Often Amazon's documentation about what the Kindle supports is inaccurate.