fieldset was not always included in WebKit form.elements:
https://bugs.webkit.org/show_bug.cgi?id=48193
(It was always present in every browser considered by ICEmobile, but it is also the case that the original authors likely didn't consider fieldset for this purpose.)
They mention keygen and object as well, but these are not likely to be a problem.
The following link is being generated: icemobile://c=scan%3Fid%3DscanOne%26ub%3Dhttp%253A//localhost%253A8080/icemobilespring/%26null&u=http%3A//localhost%3A8080/icemobilespring/qrscan&r=http%3A//localhost%3A8080/icemobilespring/%23qrscan&JSESSIONID=E6D963AE123D6539DA63E68DF44EDC50&p=%3Dundefined%26%3Dundefined