Highly related to QTBUG-140321 but more of a Wayland issue than WebEngine issue.

When user taps on a select element, the dropdown doesn’t expand. However, if one taps on the input field on the left to bring up the virtual keyboard and then tap the select element again, the select function works normally.

According to michal, <select> and virtual keyboard (either Qt one or from Weston) work perfectly if it is quicknanobrowser example. Maybe something's wrong with "Item" as root object (just a guess for now).