Expand submenu item to fit header (first right then left) - html

Question

I have the following structure:
<div class="wrap">
<div class="menu">
<div class="item">
Menu
<div class="submenu">
<div class="submenuitem">Submenu</div>
</div>
</div>
</div>
</div>
and so far the following CSS:
div.wrap {
background: #eee;
height: 80px;
}
div.menu {
margin-left: 50px;
background: #36e;
}
div.item {
background: #d00;
color: #fff;
line-height: 40px;
padding: 0px 20px;
font-size: 16px;
display: inline-block;
margin-left: 50px;
}
div.item:hover {
background: #b00;
}
div.submenu {
display: none;
background: #0b0;
height: 40px;
position: absolute;
right: 0%;
top: 50%;
min-width: 300px;
}
div.item:hover div.submenu {
display: inline-block;
}
div.submenuitem {
line-height: 40px;
padding: 0px 20px;
background: #b00;
color: #fff;
display: inline-block;
}
JSFiddle
The behaviour I'm after is that the width of submenuitem expands to fit its textual content, but that it can use at most the width of wrap for expanding. It should also be positioned directly under item unless the width of submenuitem will be larger than the distance from its original position to the right end of wrap. Thereafter it should expand to the left until it meets the left edge of wrap.
As you can see this succeeds perfectly when I can know the distance from submenuitem's original position to the right end of wrap by setting right: 0%; min-width: 300px; on submenuitem, but I want to do this in a way that doesn't require knowing that distance.
I have been trying to craft or find a solution to this for the past few days and have not managed to get any closer. Is it even possible with pure CSS to begin with?

Answer 1

Is this something you want? check this one nd let me know.
http://jsfiddle.net/zmcEC/9/
div.wrap {
width: 400px;
background: #eee;
position: relative;
height: 80px;
}
div.submenu {
display: none;
background: #0b0;
height: 40px;
position: absolute;
right: 0;
top: 40px;
left:0;
}