# JavaScript void 0 Meaning in Href Attributes > Understand what javascript:void(0) does in anchor href attributes, why it returns undefined, and why using # is a safer alternative for empty links **URL:** https://sentry.io/answers/what-does-javascript-void-0-mean/ --- ## The Problem You may have come across a website page where the `href` value of an `` tag has a value of javascript:void(0). What does this mean? ## The Solution A `javascript:` URL prefix indicates to the browser that the JavaScript code following the prefix should be executed, instead of navigating to the URL. The [void operator](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/void) evaluates an expression and returns `undefined`. By running `void(0)` in the URL JavaScript code, nothing is evaluated or returned. A link that does not navigate to a new page or section of a page may be used to define empty links during development, but using an `href` value of "#" is a better option due to potential XSS vulnerabilities with the use of `javascript:` URL prefixes. This is further explained in the following article: [Which href value should I use for empty JavaScript links, "#" or "javascript:void(0)"?](https://sentry.io/answers/which-href-value-should-i-use-for-empty-javascript-links/). --- *Source: [sentry.io/answers/what-does-javascript-void-0-mean/](https://sentry.io/answers/what-does-javascript-void-0-mean/)*