# IS_BROWSER > Check if the runtime is a web browser.

## Usage ```javascript var IS_BROWSER = require( '@stdlib/assert/is-browser' ); ``` #### IS_BROWSER `Boolean` indicating if the runtime is a web browser. ```javascript var bool = IS_BROWSER; // returns ```

## Notes - In order to determine whether the runtime is a web browser, the implementation must resolve the global scope, thus requiring function generation. The use of function generation may be problematic in browser contexts enforcing a strict [content security policy][mdn-csp] (CSP).

## Examples ```javascript var IS_BROWSER = require( '@stdlib/assert/is-browser' ); console.log( IS_BROWSER ); // => ```

[mdn-csp]: https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP