HTML/CSS:垂直边框重叠水平边框

Question

这是小提琴:http: //jsfiddle.net/AV38G/

HTML

<table>
    <tr class="first-line">
        <td class="first-column">Some</td>
        <td>Foobar</td>
        <td>Stuff</td>
    </tr>
    <tr>
        <td class="first-column">foobar</td>
        <td>raboof</td>
        <td>184</td>
    </tr>
    <tr>
        <td class="first-column">bar</td>
        <td>87458</td>
        <td>184</td>
    </tr>
    <tr>
        <td class="first-column">874</td>
        <td>raboof</td>
        <td>foobar</td>
    </tr>
</table>

---

CSS:

/* ACTUAL CSS */
table {
    width: 300px;
    border-collapse: collapse;
}
tr td.first-column{
    border-left: none;
}
tr.first-line {
    border-bottom: 3px solid green;
    border-top: none;
}
tr.first-line td {
    border-left: none;
}
td {
    border-left: 3px solid red;
}
tr {
    border-top: 3px solid red;
}

丑,对.那么为什么红色边框会覆盖/覆盖绿色边框？

我怎样才能得到"未被触及"的水平绿色边框？(请不要HTML5/CSS3,可访问性目的)

Answer 1

这种行为是因为你正在折叠表的边框,border-spacing: 0;而是使用,在第一个数据行上调用一个类,而不是我使用下面的选择器来关闭border-top

.second-row td {
    border-top: 0;
}

演示(在chrome和firefox上测试)

/* ACTUAL CSS */
table {
    width: 300px;
    border-spacing: 0;
}

tr td.first-column{
    border-left: none;
}

td {
    border-left: 3px solid red;
    border-top: 3px solid red;
}

tr.first-line td {
    border-left: none;
    border-bottom: 3px solid green;
    border-top: none;
}

.second-row td {
    border-top: 0;
}