[html] outline on only one border

How to apply an inset border into an HTML element, but just only on one side of it. Until now, I've been using an image to do that (GIF/PNG) that I would then use as a background and stretch it (repeat-x) and position a little off from the top of my block. Recently, I discovered the outline CSS property, which is great! But seems to circle the whole block... Is it possibly to use this outline property to do it on just only one border? Also, if not, do you have any CSS trick that could replace the background image? (so that I could personalize the colors of the outline later using CSS, etc). Thanks in advance!

Here's an image of what am trying to achieve: http://exiledesigns.com/stack.jpg

I like to give my input field a border, remove the outline on focus, and "outline" the border instead:

input {
  border: 1px solid grey;

  &:focus {
    outline: none;
    border-left: 1px solid violet;
  }
 }

You can also do it with a transparent border:

input {
  border: 1px solid transparent;

  &:focus {
    outline: none;
    border-left: 1px solid violet;
  }
 }

The great thing about HTML/CSS is that there's usually more than one way to achieve the same effect. Here's another solution that does what you want:

<nav id="menu1">
    <ul>
        <li><a href="#">Menu Link 1</a></li>
        <li><a href="#">Menu Link 2</a></li>
    </ul>
</nav>

nav {
    background:#666;
    margin:1em;
    padding:.5em 0;
}
nav ul {
    border-top:1px dashed #fff;
    list-style:none;
    padding:.5em;
}
nav ul li {
    display:inline-block;
}
nav ul li a {
    color:#fff;
}

http://jsfiddle.net/10basetom/uCX3G/1/

You can use box-shadow to create an outline on one side. Like outline, box-shadow does not change the size of the box model.

This puts a line on top:

box-shadow: 0 -1px 0 #000;

I made a jsFiddle where you can check it out in action.

INSET

For an inset border, use the inset keyword. This puts an inset line on top:

box-shadow: 0 1px 0 #000 inset;

Multiple lines can be added using comma-separated statements. This puts an inset line on the top and the left:

box-shadow: 0 1px 0 #000 inset,
            1px 0 0 #000 inset;

For more details on how box-shadow works, check out the MDN page.

I know this is old. But yeah. I prefer much shorter solution, than Giona answer

[contenteditable] {
    border-bottom: 1px solid transparent;
    &:focus {outline: none; border-bottom: 1px dashed #000;}
}

Try with Shadow( Like border ) + Border

border-bottom: 5px solid #fff;
box-shadow: 0 5px 0 #ffbf0e;

only one side outline wont work you can use the border-left/right/top/bottom

if i an getting properly your comment