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Re:Headless mode in Firefox by addedlovely on Wednesday August 30, 2017 @12:27PM (#15133485)
@page { @top-center { content: element(pageHeader); } } #pageHeader{ position: running(pageHeader); }

http://www.w3.org/TR/css3-gcpm/#running-elements

Re:Headless mode in Firefox by underbluewaters on Wednesday August 30, 2017 @12:47PM (#15133683)
Thank you for this. I've been doing this so wrong for a long time.