问题
In Internet Explorer 10 the behavior of drop-down boxes (<select> element) has changed: when expanding the box, instead of placing the list of options below the field, the list overlays the field, with the list positioned so that the currently-selected element is centered over the input field.
This is a little hard to describe, so here's a jsFiddle that shows it.
Our users are finding this behavior very confusing. Is there anything I can do in CSS to make the box behave like it did in IE9, and like every other major browser? (Perhaps something like the -ms-clear pseudo-element that hides the clear button in IE10 text input fields.)
Here's a sort of time-lapse screenshot:
回答1:
One option is dynamically change size property of the select to the number of options (or a fixed number - if you have too many options). You would do it on mouse-down, and change it back on-change.
Style, Position of select as well as additional events will have to be tweaked - but here is the proof of concept: http://jsfiddle.net/KnAXL/1/
来源：https://stackoverflow.com/questions/19056593/can-i-control-positioning-of-ie-10-select-boxes