Nav menu and ribbons broken in Internet Explorer - html

Question

I'm encountering two problems in Internet Explorer at the moment. The first is my navigation menu: the links are stacking on top of each other instead of going across the bar. Here is my code for the nav menu.
HTML
<div class="main-navigation" role="navigation" style="margin-top: 5px;">
<div class="nav-menu"><ul><li class="page_item page-item-8">design your own</li><li class="page_item page-item-10">fan photos</li><li class="page_item page-item-12">Win a free T-shirt</li></ul></div>
</div><!-- #site-navigation -->
CSS
.main-navigation li {
margin: 0px 20px 0px 0px;
position: relative;
text-align: center;
padding: 7px 0px;
}
.main-navigation li ul {
display: none;
margin: 0;
padding: 0;
position: absolute;
top: 100%;
z-index: 1;
}
.main-navigation li ul ul {
top: 0;
left: 100%;
}
.main-navigation ul li:hover > ul {
border-left: 0;
display: block;
}
.main-navigation li ul li a {
background: #efefef;
border-bottom: 1px solid #ededed;
display: block;
font-size: 11px;
font-size: 0.785714286rem;
line-height: 2.181818182;
padding: 8px 10px;
padding: 0.571428571rem 0.714285714rem;
width: 180px;
width: 12.85714286rem;
white-space: normal;
}
.main-navigation li ul li a:hover {
background: #e3e3e3;
color: #444;
}
.main-navigation .current-menu-item > a,
.main-navigation .current-menu-ancestor > a,
.main-navigation .current_page_item > a,
.main-navigation .current_page_ancestor > a {
color: #cb0000;
font-weight: bold;
}
The second problem is with my two ribbons I have for titles in the side bar.
The right bottom flap that gives it the wrap around look is not showing up.
HTML
<div class="ribbon"><strong>SPECIAL OFFERS</strong></div>
CSS
.ribbon {
padding-bottom: 7px;
padding-top: 8px;
padding-left: 3px;
color: #fff;
text-shadow: 1px 1px 0px #c1c1c1;
font-size: 15px;font-family:'Century Gothic',futura,'URW Gothic L',Verdana,sans-serif;
letter-spacing: 5px;
position:relative;
width:267px;
right:0px;
top:19px;
background-color:#212121;
-moz-border-radius:2px 0px 0px 2px; /*radius of 2px*/
-khtml-border-radius:2px 0px 0px 2px;
-webkit-border-radius:2px 0px 0px 2px;
-webkit-box-shadow: -2px 2px 4px rgba(50, 50, 50, 0.35);
-moz-box-shadow: -2px 2px 4px rgba(50, 50, 50, 0.35);
box-shadow: -2px 2px 4px rgba(50, 50, 50, 0.35);
}
.ribbon:after {
content:'';
width:0;
height:0;
border-color: #000 transparent transparent #000;
border-style:solid;
border-width:5px 5px;
position:absolute;
right:0;
bottom:-10px;
}
This code works in other major browsers, but not in IE.

Answer 1

For the first issue you should add anywhere you have display: inline-block for ie
zoom: 1;
*display: inline
Update
.main-navigation div.nav-menu > ul {
border-bottom: 1px solid #ededed;
border-top: 1px solid #ededed;
display: inline-block !important;
*display: inline
zoom: 1;
text-align: center;
width: 100%;
}
.main-navigation li a,
.main-navigation li {
display: inline-block;
*display: inline
zoom: 1;
text-decoration: none;
}
From the link you provided