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PDFs: Logical Reading Order and Tags

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From: Alan Zaitchik
Date: Jun 1, 2016 6:37AM

When we get a PDF generated out of InDesign the tags are usually non-HTML5-standard tags in a jumbled order. Yet often the logical reading order is fine, or can easily be fixed using the Acrobat tool for doing so. Testing in a screen reader like JAWS or NVDA seems to yield a pass as well- the content is read in the correct order.
How important is it that the tags themselves be (1) rearranged to match the logical reading order, and (2) thoroughly reworked to use only HTML5 standard tags?
I imagine this turns on the question whether there are AT tools other than JAWS and NVDA that depend on these tags being standard and reordered.
Thanks,
A