styleUrl

StyleUrl is a term used in software development to describe a URL that points to a stylesheet or other styling resource used by a document or user interface. In web applications, a style URL typically refers to a path to a CSS file that the renderer downloads and applies to the page. Many frameworks expose a dedicated property or attribute to declare external style resources; for example, Angular uses a component metadata property called styleUrls, which accepts an array of URLs to CSS files that should be applied to the component. The styles in styleUrls are loaded along with the component and may be scoped to the component depending on the framework version and configuration.

In plain HTML, a style URL can be provided via a link element with rel="stylesheet" and href pointing to the stylesheet. Style URLs may also reference theme files, font stacks, or design tokens stored in external stylesheets or style libraries. When using external style URLs, developers should consider performance implications such as additional HTTP requests, caching, and the impact on the critical rendering path, as well as security considerations like content security policy and cross-origin restrictions.

See also: CSS, stylesheet, link element, theming, content security policy.