Custom Elements allow web developers to define new HTML tags, extend existing ones, and create reusable web components. Custom element tag names must contain a hyphen (e.g. <user-card>).
HTML Custom Elements
Create reusable, encapsulated custom HTML tags using Web Components.
Key Takeaways: HTML Custom Elements
Mastering HTML Custom Elements helps you write clean and reliable HTML code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
HTML Custom Elements Code Example
HTML<script>
class UserCard extends HTMLElement {
connectedCallback() {
this.innerHTML = `<div style="border:1px solid #ccc;padding:10px;">User: <strong>${this.getAttribute("name")}</strong></div>`;
}
}
customElements.define("user-card", UserCard);
</script>
<user-card name="Alex Smith"></user-card>Output
User: Alex Smith rendered inside custom element
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