css子子ul其子的宽度，而不是父子

Question

我有一个包含多个子元素的菜单，我遇到的问题是子菜单显示为其父元素的宽度，而不是其子元素。

这是我的代码：

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#navbar ul {
    float: none;
    margin: 0;
    padding: 0
}
#navbar ul li {
    margin: 0;
    padding: 0;
    display: inline-block
}
#navbar ul li > a,
#navbar ul li > span {
    color: #004665;
    padding: 10px 0 10px 35px;
    margin: 0;
    display: block;
    font-family: 'roboto-condensed', sans-serif;
    font-weight: 700;
    font-size: 24px;
    text-transform: uppercase;
    line-height: 72px
}
#navbar ul li.active > a,
#navbar ul li > a:hover,
#navbar ul li > a:focus {
    color: #6fbfe6;
    background: none
}
#navbar ul li > ul {
    position: absolute;
    background: #f0f5f7;
    padding: 30px 0 20px;
    border-top: solid 2px #b1b1b1;
    display: none
}
#navbar ul li > ul li {
    display: block;
    margin: 0;
    padding: 0;
    white-space: nowrap
}
#navbar ul li > ul li > a {
    font-size: 20px;
    line-height: normal;
    margin: 0;
    padding: 0 30px 10px;
    white-space: nowrap
}
#navbar ul li > ul li > ul {
    left: 100%;
    right: 0;
    z-index: 1000;
    top: -32px;
    width: 100%
}
#navbar ul li > ul li > ul li.parent:hover > ul {
    display: block
}

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<ul>
    <li class="item-120 parent">
        <a href="/">Academics</a>
        <ul class="nav-child">
            <li class="item-204 parent"><a href="/">IB Programmes</a>
            <li class="item-205 parent">
                <a href="/">VCE</a>
                <ul class="nav-child">
                    <li class="item-215"><a href="/">VCE Overview</a></li>
                    <li class="item-216"><a href="/">Outcomes and SACs</a></li>
                    <li class="item-217"><a href="/">Assessment and Scoring</a></li>
                    <li class="item-218"><a href="/">Subjects We Offer</a></li>
                    <li class="item-219"><a href="/">Who is the VCE for?</a></li>
                </ul>
            </li>
            <li class="item-205 parent"><a href="/">Student Wellbeing</a>
            <li class="item-207 parent"><a href="/">Resource Library</a>
        </ul>
    </li>
</ul>

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在这里小提琴：https://jsfiddle.net/fw16jw1y/

Answer 1

从以下代码中删除width: 100%和right: 0：

#navbar ul li > ul li > ul {
    left: 100%;
    right: 0;   /* REMOVE */
    z-index: 1000;
    top: -32px;
    width: 100%  /* REMOVE */
}

您通过定义ul来包含width元素。

<强> Working Fiddle

Answer 2

尝试这样的事情，

nav > ul > li > ul > li > a {
    max-width: 150px;
    text-overflow: ellipsis;
    overflow: hidden;
}

你可以回复这篇文章， Child element auto width (larger than parent)， Allow absolutely positioned element to be wider than parent absolutely positioned element