Device/Reading System implementing "RS4c" of "Charter Proposal: Advanced/Hybrid Layouts"

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In the proporsal "Charter Proposal: Advanced/Hybrid Layouts", I found :

"When the device characteristics change dynamically (e.g. orientation change by the user), it is possible for a Reading System to change rendering to use a rendition that better fits the new circumstances, without losing the current reading position"

http://www.idpf.org/charters/2012/layout/ahl.html#h.eub0wrqgo7eg

Is there any device or reading system implementing this function?

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