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This has been available on iOS since iOS 6. I'm surprised more people don't know about it!

• educating 13y ago
  It's neat and useful but having text sometimes scroll under other text is going to be disorienting for some. Personally, though I like that it will be an option, I don't want it in my pages. For documentation it just gets in the way of other text to read. Headers are a marker and starting context- they don't need to continue to be displayed.