为什么position: sticky在其父元素overflow-x: auto时不处理表thead元素？
我需要一个响应式表格，在下面的示例中，如果我从类中删除overflow-x: auto;.wrapper粘性标头可以工作，否则它不起作用？如何解决此问题？
谢谢
.wrapper {
max-width: 300px;
overflow-x: auto;
}
.sticky {
position: sticky;
top: 0;
}
#customers {
font-family: Arial, Helvetica, sans-serif;
border-collapse: collapse;
width: 100%;
max-width: 200px;
}
#customers td, #customers th {
border: 4px solid #ddd;
padding: 8px;
min-width: 200px;
}
#customers tr:nth-child(even){background-color: #f2f2f2;}
#customers tr:hover {background-color: #ddd;}
#customers th {
padding-top: 12px;
padding-bottom: 12px;
text-align: left;
background-color: #04AA6D;
color: white;
}<h1>Customers</h1>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Recusandae tempore esse sed nesciunt non incidunt nemo necessitatibus ipsam facilis, fugit quas nostrum iste nihil ad a blanditiis, vel, harum dolorum?</p>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Recusandae tempore esse sed nesciunt non incidunt nemo necessitatibus ipsam facilis, fugit quas nostrum iste nihil ad a blanditiis, vel, harum dolorum?</p>
<p>Lorem ipsum dolor sit amet consectetur adipisicing elit. Recusandae tempore esse sed nesciunt non incidunt nemo necessitatibus ipsam facilis, fugit quas nostrum iste nihil ad a blanditiis, vel, harum dolorum?</p>
<div class='wrapper'>
<table id="customers">
<thead class='sticky'>
<tr>
<th>Company</th>
<th>Contact</th>
<th>Country</th>
</tr>
</thead>
<tr>
<td>Alfreds Futterkiste</td>
<td>Maria Anders</td>
<td>Germany</td>
</tr>
<tr>
<td>Berglunds snabbköp</td>
<td>Christina Berglund</td>
<td>Sweden</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Centro comercial Moctezuma</td>
<td>Francisco Chang</td>
<td>Mexico</td>
</tr>
<tr>
<td>Ernst Handel</td>
<td>Roland Mendel</td>
<td>Austria</td>
</tr>
<tr>
<td>Island Trading</td>
<td>Helen Bennett</td>
<td>UK</td>
</tr>
<tr>
<td>Königlich Essen</td>
<td>Philip Cramer</td>
<td>Germany</td>
</tr>
<tr>
<td>Laughing Bacchus Winecellars</td>
<td>Yoshi Tannamuri</td>
<td>Canada</td>
</tr>
<tr>
<td>Magazzini Alimentari Riuniti</td>
<td>Giovanni Rovelli</td>
<td>Italy</td>
</tr>
<tr>
<td>North/South</td>
<td>Simon Crowther</td>
<td>UK</td>
</tr>
<tr>
<td>Paris spécialités</td>
<td>Marie Bertrand</td>
<td>France</td>
</tr>
<tr>
<td>Paris spécialités</td>
<td>Marie Bertrand</td>
<td>France</td>
</tr>
<tr>
<td>Paris spécialités</td>
<td>Marie Bertrand</td>
<td>France</td>
</tr>
<tr>
<td>Paris spécialités</td>
<td>Marie Bertrand</td>
<td>France</td>
</tr>
<tr>
<td>Paris spécialités</td>
<td>Marie Bertrand</td>
<td>France</td>
</tr> <tr>
<td>Paris spécialités</td>
<td>Marie Bertrand</td>
<td>France</td>
</tr>
<tr>
<td>Paris spécialités</td>
<td>Marie Bertrand</td>
<td>France</td>
</tr>
<tr>
<td>Paris spécialités</td>
<td>Marie Bertrand</td>
<td>France</td>
</tr> <tr>
<td>Paris spécialités</td>
<td>Marie Bertrand</td>
<td>France</td>
</tr>
</table>
</div>您无法position: stickythead，但有解决方法。