HTML and CSS browser compatibility issue - html

Question

I have originally created my navigation in Chrome in which the outcome fits perfectly to my needs. I have then found out that Mozilla Firefox won't output the same result, the drop-down menus under Member Action and Admin Related will display vertically instead on horizontally as i wanted. However my biggest dissapointment was testing the navigation in Internet Explorer which won't even show the drop-down menus.
I would really appreciate someone checking the below code and your feedback, Thanks.
Solved the problem by changing one of the lines in css;
navigation ul li {float: left; list-style:none; }
HTML
<div id="navigationContainer">
<div id="navigation">
<ul>
<li class="borderleft">Home </li>
<li>Register </li>
<li>Search cars</li>
<li>Display all cars</li>
<li>Member Actions
<ul> <!-- Open drop down menu -->
<li class="bordertop">Login</li>
<li class="floatLeft">Member Area</li>
<li>Reservation</li>
<li>Contact us</li>
<li>Admin Related
<ul>
<li class="bordertop">Insert new car</li>
<li>Delete a car</li>
</ul>
</li>
</ul>
</div>
</div>
</BODY>
</HTML>
CSS
* {padding: 0%; margin 0%; } /* Overwrites the browser stylesheet */
#navigationContainer {background:url(images/navi.png); width:100%;position: relative; white-space:nowrap; word-spacing:0; }
#navigation {width:1200px; height:65px; position: relative; font-family: Arial; margin: 2px auto; font-size: 125%; }
#navigation ul { list-style-type: none; }
#navigation ul li {float: left; position: relative; }
#navigation ul li a { border-right: 2px solid #e9e9e9; padding: 20px;
display: block; margin: 0 auto; text-align: center; color: black; text-decoration: none; }
#navigation ul li a:hover { background: blue; color: white; }
#navigation ul li ul { display: none; }
#navigation ul li:hover ul {display: block; position: absolute; }
#navigation ul li ul li {float:left; position:relative; }
#navigation ul li:hover ul li a { background: #12aeef; color: white; position:relative; margin: 0px auto; border-bottom: 1px solid white; border-right: 1px solid white; width: 119px; }
#navigation ul li:hover ul li a:hover { background: blue;}
.bordertop { border-top: 1px solid white; }
.borderleft { border-left: 2px solid #e9e9e9;}

Answer 1

Try this
http://jsfiddle.net/Vf3AJ/
Example from: http://www.cssnewbie.com/example/css-dropdown-menu/horizontal.html
EDITED
Misread horizontal for vertical. tested in IE10, FF, and Chrome
As a side note: horizontal menus have serious issues depending on the width of the viewers screen.
CSS
nav {
position: absolute;
top: 0;
right: 0;
margin: 0;
padding: 0;
}
nav li {
list-style: none;
float: left;
}
nav li a {
display: block;
padding: 3px 8px;
text-transform: uppercase;
text-decoration: none;
color: #999;
font-weight: bold;
}
nav li a:hover {
background: blue;
color: white;
}
nav li ul {
display: none;
}
nav li:hover ul, nav li.hover ul {
position: absolute;
display: inline;
left: 0;
width: 100%;
margin: 0;
padding: 0;
}
nav li:hover li, nav li.hover li {
float: left;
}
nav li:hover li a, navbar li.hover li a {
color: #000;
}
nav li li a:hover {
color: white;
}
HTML
<div id="navigationContainer">
<nav id="navigation">
<ul>
<li class="borderleft">Home
</li>
<li>Register
</li>
<li>Search cars
</li>
<li>Display all cars
</li>
<li>Member Actions
<ul>
<!-- Open drop down menu -->
<li class="bordertop">Login
</li>
<!-- A bordertop class is given to this listed element in order to style a top border for in in the external CSS file. -->
<li class="floatLeft">Member Area
</li>
<li>Reservation
</li>
</ul>
</li>
<li>Contact us
</li>
<li>Admin Related
<ul>
<li class="bordertop">Insert new car
</li>
<li>Delete a car
</li>
</ul>
</li>
</ul>
</nav>
</div>