html - Submit button not reaching server with select list -

html - Submit button not reaching server with select list -

i'm finding when utilize next html code in chrome , mozilla , nail come in rather clicking submit button, submit button included selection , password server, when utilize explorer selection , password included. i'm using explorer 9. there i'm missing or there way explorer incluce button info though nail enter.

<form method=post action=/plm.cgi> <select name="dropdown"> <option value="maths" selected>maths</option> <option value="physics">physics</option> </select> <input type=password name=adminpassword size=11> adminpassword <input type="submit" name="operation" value="submit" /> </form>

give submit input name:

<input name="submit" type="submit" value="submit" />

html