we are forced to use XHTML(5), because we are using XForms. So must send as HTTP-Header that we are we have a XML document (withput it XForms don't work).
My problem now: I want now to use PIE. PIE works, as long I don't send XHTML-HTTP-Header. But if I send XHTML-HTTP-Header PIE is doing nothing anymore.
Any idea how to solve the problem?
header("Content-Type: application/xhtml+xml; charset=utf-8"); //uncomment this line of code and it works, but we need this
<body style="-pie-background: linear-gradient(#EEFF99, #66EE33); behavior: url('PIE.htc');">