As far as I can see in the jQM JavaScript code the browser is tested against a number of features to see if they are supported but perhaps this line is important at this alpha stage
var fakeBody = $( "<body>" ).prependTo( "html" ),
fbCSS = fakeBody[0].style,
vendors = ['webkit','moz','o'],
webos = window.palmGetResource || window.PalmServiceBridge, //only used to rule out scrollTop
bb = window.blackberry; //only used to rule out box shadow, as it's filled opaque on BB
I think it is best to accept that we have to test against any platform that interests us rather than assume jQM will work on a given platform