[Fix] closedBy -> closedby

See #3980

Author: ljharb

CHANGELOG.md

@@ -11,7 +11,7 @@ This change log adheres to standards from [Keep a CHANGELOG](https://keepachange
 
 ### Fixed
 * [`no-unknown-property`]: allow `onLoad` on `body` ([#3923][] @DerekStapleton)
-* [`no-unknown-property`]: allow `closedBy` on `dialog` ([#3980][] @ljharb)
+* [`no-unknown-property`]: allow `closedby` on `dialog` ([#3980][] @ljharb)
 
 [#3980]: https://github.com/jsx-eslint/eslint-plugin-react/issues/3980
 [#3930]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3930

lib/rules/no-unknown-property.js

@@ -33,7 +33,7 @@ const ATTRIBUTE_TAGS_MAP = {
   abbr: ['th', 'td'],
   charset: ['meta'],
   checked: ['input'],
-  closedBy: ['dialog'],
+  closedby: ['dialog'],
   // image is required for SVG support, all other tags are HTML.
   crossOrigin: ['script', 'img', 'video', 'audio', 'link', 'image'],
   displaystyle: ['math'],

tests/lib/rules/no-unknown-property.js

@@ -149,7 +149,7 @@ ruleTester.run('no-unknown-property', rule, {
     { code: '<hr align="top" />' },
     { code: '<applet align="top" />' },
     { code: '<marker fill="#000" />' },
-    { code: '<dialog closedBy="something" onClose={handler} open id="dialog" returnValue="something" onCancel={handler2} />' },
+    { code: '<dialog closedby="something" onClose={handler} open id="dialog" returnValue="something" onCancel={handler2} />' },
     {
       code: `
         <table align="top">