Chrome vs Safari renders pdf Iframe object differently 
Auteur : Adrian B.
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Safari looses Iframe options. Safari issue or X5 issue?
See attached - Chrome left / Safari right
Adrian
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screenshot attached
... obviously it's not a problem with the program but with the obsolete browser you mentioned which also brings with it many other problems...
... then it is known that PDF is not a format for the WEB, but a proprietary format created basically for printing documents, ...or for downloading and consulting with specific local readers...
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ciao
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