A best practice would be to avoid both left and justify for the text-align property and leave this choice to the reading system/user.
oeb-page-head is barely defined in the official specs and it's a bad idea anyway. With DE you could display this as a header using their XPGT extension (XSL-FO) but overall, the IDPF need to take a decision regarding paged media. It is a very complex issue though: CSS3 modules are not finalized and Adobe will probably push forward XSL-FO.
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