IE11 read-only choice list contain a selectable downward arrow.
Steps to Reproduce
Open an Incident form in Internet Explorer 11.
Make one of the choice fields read only, for example, the Impact field.
Run g_form.setReadOnly("impact","true"); on your browser console on incident.do.
Note that there is a drop-down downward arrow, as shown in the following screenshot.
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Related Problem: PRB1257304