css - HTML/CSS : IE8 padding/background-position problems

Question

要查看问题页面的实时 View ，请访问此处:http://rcnhca.org.uk/sites/first_steps/health-safety-and-security/

问题 1: 如果您转到该链接并滚动下拉导航，它是子项，您会注意到我在 上的每个 li 上设置了一个星形背景图像动画鼠标输入。然而，当你第一次在 IE8 中滚动它时，它会从 li 的中间开始动画，即使我指定了 background-position: -25px 50%;，奇怪的是一旦 jquery 内联应用相同的设置，它就会开始按预期工作。

问题 2: 如下图所示，IE8 (这在 IE7 中正常工作) 错误地呈现了我的填充。我已经使用 * {margin: 0; 重置了所有边距和填充填充:0；在core.css :

这个导航栏的 HTML 标记是:

<header class="one">
    <nav class="container_16 clearfix" id="breadcrumbs">
        <a href="http://rcnhca.org.uk/sites/first_steps" id="home"></a>
        <ul id="parent">
            <li>
                <a href="http://rcnhca.org.uk/sites/first_steps/communication/">Communication</a>
                <ul class="child">
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/getting-started/">Getting started</a></li>
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/health-safety-and-security/">Health, Safety and Security</a></li>
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/personal-and-people-development/">Personal and people development </a></li>
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/quality/">Quality</a></li>
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/equality-diversity-and-rights/">Equality, diversity and rights </a></li>
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/clinical-skills/">Clinical skills</a></li>
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/additional-material/">Additional material</a></li>
                </ul>
            </li>
            <li>
                <a href="#">Select a topic</a>
                <ul class="child">
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/communication/why-communication-is-important/">Why communication is important</a></li>
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/communication/communication-methods/">Communication methods</a></li>
                    <li><a href="http://rcnhca.org.uk/sites/first_steps/communication/written-communication/">Barriers to communication</a></li>
                </ul>
            </li>
        </ul>
    </nav>
</header>

以及要启动的 CSS:

header {
    width: 100%;
}

header.one {
    height: 50px;
    background: #44a9c4;
}

header.two {
    height: 45px;
    background: #3393b5;
}


/* =============================================================================
   Breadcrumb navigation
   ========================================================================== */

#breadcrumbs {
    padding: 0 3px 3px 0;
    background: #ffffff;
    border: 0px solid;
    border-left: #3a90a7 2px solid;
    border-right: #3a90a7 2px solid;
    border-bottom: #3a90a7 2px solid;
    -webkit-border-bottom-left-radius: 5px;
    -webkit-border-bottom-right-radius: 5px;
    -moz-border-radius-bottomleft: 5px;
    -moz-border-radius-bottomright: 5px;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

#breadcrumbs #home{
    display: block;
    height: 39px;
    width: 55px;
    float: left;
    background-image: url(library/images/home_icon.png);
    background-repeat: no-repeat;
    background-position: center;    
    text-indent: -999em;
}

#breadcrumbs ul#parent {
    height: 39px;
    width: 905px;
    float: right;
    position: relative;
    background: #f38630;
    border: 0px solid;
    -webkit-box-shadow: inset 0px -2px 0px 0px #cf7229;
    -moz-box-shadow: inset 0px -2px 0px 0px #cf7229;
    box-shadow: inset 0px -2px 0px 0px #cf7229;
    -webkit-border-bottom-left-radius: 5px;
    -webkit-border-bottom-right-radius: 5px;
    -moz-border-radius-bottomleft: 5px;
    -moz-border-radius-bottomright: 5px;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

#breadcrumbs ul#parent li {
    position: relative;
    height: 39px;
    float: left;
    min-width: 1px; /* required to fix Opera bug */
    padding: 0 47px 0 15px;
    background-image: url(library/images/breadcrumb_seperator.png);
    background-repeat: no-repeat;
    background-position: right;
    line-height: 39px;
}

#breadcrumbs ul#parent li a {
    display: block;
    height: 42px;
    font-size: 0.938em;
    font-weight:900;
    letter-spacing: 0.01em;
    color: #ffffff;
    text-decoration: none;
    text-shadow: 0px 2px 0px #cf7229;
}

#breadcrumbs ul li a:visited {
    color: #ffffff;
}
#breadcrumbs ul#parent li:first-child ul {
    left: -5px;
}
#breadcrumbs ul#parent li ul {
    position: absolute;
    z-index: 1;
    left: -28px;
    top: 42px;
    background: #ffffff;
    border-left: #3a90a7 2px solid;
    border-right: #3a90a7 2px solid;
    border-bottom: #3a90a7 2px solid;
    -webkit-border-bottom-left-radius: 5px;
    -webkit-border-bottom-right-radius: 5px;
    -moz-border-radius-bottomleft: 5px;
    -moz-border-radius-bottomright: 5px;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

.js #breadcrumbs ul#parent li ul {
    display:none;
}

.no-js #breadcrumbs ul#parent li ul {
    left: -999em;
}

#breadcrumbs ul#parent li ul li {
    float: none;
    height: 26px;
    margin: 0 3px 3px 3px;
    padding: 0 15px;
    background-image: url(library/images/star-icon.png);
    background-position: -25px center;
    background-repeat: no-repeat;
    background-color: #738793;
    border-radius: 5px; 
    -moz-border-radius: 5px; 
    -webkit-border-radius: 5px;
    line-height: 26px;
    white-space: nowrap;
}

#breadcrumbs ul#parent li ul li a{
    color: #ffffff;
    text-decoration: none;
    text-shadow: none;
    letter-spacing: 0.01em;
    font-weight: 100;
}

#breadcrumbs ul#parent li ul li:hover{
    background-color: #3393b5;
}

.no-js #breadcrumbs ul#parent li ul li:hover{
    background-position: 6px center;
    text-indent: 10px;
}

#breadcrumbs ul#parent li:hover ul {
    z-index: 2;
}

.no-js #breadcrumbs ul#parent li:hover ul {
    left: -5px;
}

我花了很长时间试图调试这个问题，但无法弄清楚为什么会这样，如果有人能对这个问题有所了解那就太好了。 (注意:我使用 HTML5SHIV 在旧版浏览器中呈现 HTML5 元素)

Answer 1

我不知道这个错误是什么或者为什么 IE8 会这样，但我设法通过从 #home 和 ul# 中删除 float 来解决边距问题parent 并相对于 #breadcrumbs 绝对定位它们并为其指定一个明确的高度，如下所示:

#breadcrumbs {
    height: 39px;
    padding: 0 3px 3px 0;
    background: #ffffff;
    position: relative;
    border: 0px solid;
    border-left: #3a90a7 2px solid;
    border-right: #3a90a7 2px solid;
    border-bottom: #3a90a7 2px solid;
    -webkit-border-bottom-left-radius: 5px;
    -webkit-border-bottom-right-radius: 5px;
    -moz-border-radius-bottomleft: 5px;
    -moz-border-radius-bottomright: 5px;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

#breadcrumbs #home{
    display: block;
    position: absolute;
    top: 0px;
    left: 0px;
    height: 39px;
    width: 55px;
    float: left;
    background-image: url(library/images/home_icon.png);
    background-repeat: no-repeat;
    background-position: center;    
    text-indent: -999em;
}

#breadcrumbs ul#parent {
    height: 39px;
    width: 885px;
    position: absolute;
    right: 3px;
    top: 0px;
    background: #f38630;
    margin: 0px;
    -webkit-box-shadow: inset 0px -2px 0px 0px #cf7229;
    -moz-box-shadow: inset 0px -2px 0px 0px #cf7229;
    box-shadow: inset 0px -2px 0px 0px #cf7229;
    -webkit-border-bottom-left-radius: 5px;
    -webkit-border-bottom-right-radius: 5px;
    -moz-border-radius-bottomleft: 5px;
    -moz-border-radius-bottomright: 5px;
    border-bottom-left-radius: 5px;
    border-bottom-right-radius: 5px;
}

对于背景图片的问题，我制作了一个 jquery 函数，在元素加载后将背景位置添加到内联元素中。