typo fix

files/en-us/web/css/css_syntax/error_handling/index.md

@@ -8,7 +8,7 @@ page-type: guide
 
 When an error exists in CSS, such as an invalid value or a missing semicolon, instead of [throwing an error like in JavaScript](/en-US/docs/Web/JavaScript/Reference/Errors), the browser (or other user agent) will gracefully recover. Browsers don't provide CSS-related alerts or otherwise indicate errors have occurred in styles. They just discard invalid content and parse subsequent valid styles. This is a feature of CSS, not a bug.
 
-This guide discusses how CSS {{glossary("parser", "parsers")}} discards invalid CSS.
+This guide discusses how CSS {{glossary("parser", "parsers")}} discard invalid CSS.
 
 ## CSS parser errors