Update index.md (#2182)

1 files changed, 1 insertions, 1 deletions

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@@ -38,7 +38,7 @@ JavaScript (or, more formally, ECMAScript) is just a _specification_ for a progr
 
 ### Browsers
 
-But most JavaScript programs don't run a vacuum. They need a way to access to the outside world to perform useful tasks. This is where _runtimes_ come in. They implement additional APIs that are then made available to the JavaScript programs they execute. Notably, browsers ship with JavaScript runtimes that implement a set of Web-specific APIs that are exposed via the global `window` object. Any JavaScript code executed by the browser can use these APIs to implement interactive or dynamic behavior in the context of the current webpage.
+But most JavaScript programs don't run in a vacuum. They need a way to access to the outside world to perform useful tasks. This is where _runtimes_ come in. They implement additional APIs that are then made available to the JavaScript programs they execute. Notably, browsers ship with JavaScript runtimes that implement a set of Web-specific APIs that are exposed via the global `window` object. Any JavaScript code executed by the browser can use these APIs to implement interactive or dynamic behavior in the context of the current webpage.
 
 <!-- JavaScript runtime that exposes  JavaScript engines are designed to run "vanilla" JavaScript programs, but it's often JavaScript _runtimes_ use an engine internally to execute the code and implement additional APIs that are then made available to executed programs.
 JavaScript was [initially designed](https://en.wikipedia.org/wiki/JavaScript) as a language to run in web browsers to implement interactivity and dynamic behavior in web pages. Browsers are the first JavaScript runtimes. JavaScript programs that are executed in browsers have access to a set of Web-specific global APIs on the `window` object. -->