TAG
JavaScript
Result
Run
License
<button type="button" id="btn-demo">Show Demo</button>
class MyContent extends HTMLElement { constructor() { super(); const sr = this.attachShadow({ mode: "open" }); const ElStyle = document.createElement("style"); ElStyle.textContent = `h1 { background-color: yellow; }`; const ElStyle2 = document.createElement("style"); ElStyle2.textContent = `h1 { border: 1px solid #CCC; }`; const ElAddH1 = document.createElement("h1"); ElAddH1.textContent = "I am shadow root's element."; sr.append(ElStyle, ElStyle2, ElAddH1); } } document.addEventListener("DOMContentLoaded", () => { const ElBtnDemo = document.getElementById("btn-demo"); let elMyContent; ElBtnDemo.addEventListener("click", e => { customElements.define("my-content", MyContent); elMyContent = document.createElement("my-content"); document.body.append(elMyContent); console.log(elMyContent.shadowRoot.styleSheets.length); }); });
Console
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License
License
by DevDic
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