The customElements property returns a reference to a CustomElementRegistry object, which can be further used to register new custom elements and hence get information about previously registered custom elements.
Syntax:
var obj = window.customElements;
Return Value:
- CustomElementRegistry Object: This property returns an object which contains details about Custom Elements defined.
Example: In this example, we will get information about custom elements and will create a custom element using define() method.
html
<!DOCTYPE HTML> <html> <head> <title>customElements property</title></head> <body style="text-align:center;"> <h1 style="color:green;"> GeeksForGeeks </h1> <p> HTML | customElements property </p> <button onclick = "Geeks();"> click here </button> <p id="arr"> </p> <script> var arr = document.getElementById("arr"); function Geeks() { let customElementRegistry = window.customElements; class CustomTitle extends HTMLElement { constructor() { super() this.attachShadow({ mode: 'open' }) this.shadowRoot.innerHTML = ` <h1>Newly Defined Custom Element's Data</h1> ` } } window.customElements.define( 'custom-title', CustomTitle); console.log(customElementRegistry) } </script> <custom-title></custom-title></body> </html> |
Output:
Before Button Click:
After Button Click:
customElements object:
Supported Browsers:
- Google Chrome 54 and above
- Edge 79 and above
- Firefox 63 and above
- Safari 10.1 and above
- Opera 41 and above
- Internet Explorer not supported
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