Yes, functional custom HTML tags can be created through Web Components. 1. Create a class that inherits HTMLElement; 2. Use customElements.define() to register a tag; 3. Use this tag in HTML. It should be noted that the naming must contain hyphens, compatibility issues and SEO impact. It is recommended to use ordinary tags to add class to the display purpose.
Yes, you can create custom HTML tags, but this is not a traditional "custom tag". In modern web development, there are ways to achieve similar effects and make it work meaningfully.
What are custom HTML tags?
HTML itself has a set of predefined tags (such as <div> , <code><p></p> , <span></span> , etc.), but you can use any tag name you like in your code, such as: 
<my-tag>This is a non-standard tag</my-tag>
Browsers usually treat it as an unknown inline element, and the default style will not be applied, but it can still be displayed normally in the page. However, this does not comply with the HTML specification unless you are using Web Components technology.
The actual way to customize elements: Web Components
If you want custom tags to be truly functional, reusable and have clear structure, you should use customElements.define() method of Web Components . The basic steps are as follows:
- Create a class that inherits
HTMLElement - Register your new tag using
customElements.define() - Use this new tag in HTML
Sample code:
class MyTag extends HTMLElement {
constructor() {
super();
this.attachShadow({ mode: 'open' });
this.shadowRoot.innerHTML = `<p>This is my custom tag content</p>`;
}
}
customElements.define('my-tag', MyTag);Then you can write it in HTML like this:
<my-tag></my-tag>
This way, you have a complete custom HTML element.
Notes and FAQs
Although custom tags can be created, there are some things to note:
- Naming rules : Custom tags must contain hyphens (for example
<my-tag></my-tag>is legal, while<mytag></mytag>is not legal) - Compatibility : Older browsers may not support Web Components, polyfill needs to be introduced
- Semantics and SEO : Search engines and assistive technologies may not understand your custom tags. It is recommended to use ARIA properties or use semantic tags to wrap
If you just want to organize your code structure or increase readability, it may be safer to use data-* attributes or <div> plus class.<h2 id="Let-s-summarize"> Let's summarize</h2>
<p> Instead of simply writing an unrecognized tag name, you can create a truly functional custom HTML tag through Web Components. It's powerful but also slightly more complex. If it is only for display purposes, adding class to ordinary tags is more practical.<br> Basically that's it.</p>
</div>
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