Shadow DOM 为Web组件中的DOM和CSS提供了封装,保持与主文档的DOM保持分离。::part()则可以为Shadow DOM中具有匹配part属性的任何元素添加样式。
HTML
<template id="tabbed-custom-element">
<style type="text/css">
*, ::before, ::after {
box-sizing: border-box;
padding: 1rem;
}
:host {
display: flex;
}
</style>
<div part="tab active">Tab 1</div>
<div part="tab">Tab 2</div>
<div part="tab">Tab 3</div>
</template>
<tabbed-custom-element></tabbed-custom-element>
CSS
tabbed-custom-element::part(tab) {
color: #0c0c0dcc;
border-bottom: transparent solid 2px;
}
tabbed-custom-element::part(tab):hover {
background-color: #0c0c0d19;
border-color: #0c0c0d33;
}
tabbed-custom-element::part(tab):hover:active {
background-color: #0c0c0d33;
}
tabbed-custom-element::part(tab):focus {
box-shadow:
0 0 0 1px #0a84ff inset,
0 0 0 1px #0a84ff,
0 0 0 4px rgba(10, 132, 255, 0.3);
}
tabbed-custom-element::part(active) {
color: #0060df;
border-color: #0a84ff !important;
}