<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
/*所有自定义元素*/
:defined{
color: red;
}
/*指定的自定义元素*/
simple-custom:defined{
font-size: 24px;
}
</style>
</head>
<body>
<simple-custom text="我是自定义文本"></simple-custom>
</body>
<script>
customElements.define('simple-custom',
class extends HTMLElement {
constructor() {
super();
let divElem = document.createElement('div');
divElem.textContent = this.getAttribute('text');
let shadowRoot = this.attachShadow({mode: 'open'})
.appendChild(divElem);
}
})
</script>
</html>自定义元素的创建及css选中
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转载自blog.csdn.net/github_38108899/article/details/86689907
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