The Custom HTML Element Name Validator is a utility that checks whether a proposed HTML tag name is valid for creating custom elements according to the Web Components specification. Custom element names must include a hyphen, avoid reserved names, and follow specific naming rules to ensure compatibility across browsers.
Users input a candidate tag name, and the validator analyzes it against the rules of the HTML standard, highlighting whether the name is valid or invalid. This helps developers avoid naming conflicts, ensures correct registration with the customElements.define() API, and prevents runtime errors when defining new components.
For example, names like my-widget or x-button are valid custom element names, whereas names such as widget or button would be flagged as invalid. By providing immediate feedback, this tool streamlines the development of standards-compliant custom elements for modern web applications.