Limiting the width of the child UL within an LI element in a dropdown navigation menu

I am trying to find a way to limit the width of a <ul> tag within a dropdown menu in CSS to match the width of its parent <li> element without setting a fixed width. Despite my efforts, I have not been successful in achieving this and I am seeking help to better understand how it can be done.

Is there a specific property that can make this possible?

I have created a simple jsfiddle example http://jsfiddle.net/zAXRK/2/ to demonstrate the issue. Can someone explain if and how this can be achieved?

Currently, when hovering over the "First Item," the sub-menu appears causing the containing <li> element to expand and push other elements aside.

My goal is to have the sub-menu always match the width of its parent element dynamically, without fixing it. If a solution cannot be found in CSS, I am willing to use JavaScript as a last resort, but prefer a clean CSS solution as an exercise.

Thank you to anyone who can provide insight into CSS rules. If the answer is out there and I have missed it or misunderstood it, please forgive me.

cssdrop-down-menu

Answer №1

To ensure proper display, it is necessary to define certain position attributes for both the li and .submenu elements in order to set a dynamic width of 100%:

Follow these modifications:

.menu > li {
    position: relative;
} 

.sub-menu {
    position: absolute;
    width: 100%;
}

See the solution in action on this live example at jsFiddle.

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