Open In App

HTML is Attribute

Last Updated : 23 Jul, 2025
Comments
Improve
Suggest changes
Like Article
Like
Report

The HTML is attribute global attribute allows a standard element to adopt behavior defined by a custom built-in element, but only after the custom element is defined.

Syntax

<tag is="word-count"></tag>

Here, the tag could be any HTML tag.

HTML is Attribute Example

Example 1: In this example, we define a custom element <p is="word-count"> that dynamically counts the words in its parent article's content and displays the count.

HTML 
<!DOCTYPE html>
<html>

<body>
    <article contenteditable="">
        <p>
            HTML stands for HyperText Markup
            Language. It is used to design web
            pages using a markup language.
            HTML is the combination of
            Hypertext and Markup language.
        </p>
        <p is="word-count"></p>
    </article>
    <script>
        class WordCount extends HTMLParagraphElement {
            constructor() {
                super();
                const shadow =
                    this.attachShadow({
                        mode: "open",
                    });
                const span =
                    document.createElement(
                        "span"
                    );
                shadow.appendChild(span);
                setInterval(() => {
                    const text =
                        this.parentNode
                            .innerText ||
                        this.parentNode
                            .textContent;
                    span.textContent = `Words: ${text.split(/\s+/g)
                            .length
                        }`;
                }, 200);
            }
        }
        customElements.define(
            "word-count",
            WordCount,
            { extends: "p" }
        );
    </script>
</body>

</html>

Output:

isAttribute
HTML is Attribute Example Output

Supported Browsers:


Next Article
HTML Introduction

S
skyridetim
Improve
Article Tags :

Similar Reads

We use cookies to ensure you have the best browsing experience on our website. By using our site, you acknowledge that you have read and understood our Cookie Policy & Privacy Policy
Lightbox