[Fix] no-unknown-property: allow onLoad on body

DerekStapleton · ljharb · commit fd08120ddbe1 · 2025-05-05T14:44:25.000-05:00
They body tag supports an onload event https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/load_event
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -6,6 +6,11 @@ This change log adheres to standards from [Keep a CHANGELOG](https://keepachange
 
 ## Unreleased
 
+### Fixed
+* [`no-unknown-property`]: allow `onLoad` on `body` ([#3923][] @DerekStapleton)
+
+[#3923]: https://github.com/jsx-eslint/eslint-plugin-react/pull/3923
+
 ## [7.37.5] - 2025.04.03
 
 ### Fixed
diff --git a/lib/rules/no-unknown-property.js b/lib/rules/no-unknown-property.js
@@ -85,7 +85,7 @@ const ATTRIBUTE_TAGS_MAP = {
   onEncrypted: ['audio', 'video'],
   onEnded: ['audio', 'video'],
   onError: ['audio', 'video', 'img', 'link', 'source', 'script', 'picture', 'iframe'],
-  onLoad: ['script', 'img', 'link', 'picture', 'iframe', 'object', 'source'],
+  onLoad: ['script', 'img', 'link', 'picture', 'iframe', 'object', 'source', 'body'],
   onLoadedData: ['audio', 'video'],
   onLoadedMetadata: ['audio', 'video'],
   onLoadStart: ['audio', 'video'],
diff --git a/tests/lib/rules/no-unknown-property.js b/tests/lib/rules/no-unknown-property.js
@@ -74,6 +74,7 @@ ruleTester.run('no-unknown-property', rule, {
     { code: '<link onLoad={bar} onError={foo} />' },
     { code: '<link rel="preload" as="image" href="someHref" imageSrcSet="someImageSrcSet" imageSizes="someImageSizes" />' },
     { code: '<object onLoad={bar} />' },
+    { code: '<body onLoad={bar} />' },
     { code: '<video allowFullScreen webkitAllowFullScreen mozAllowFullScreen />' },
     { code: '<iframe allowFullScreen webkitAllowFullScreen mozAllowFullScreen />' },
     { code: '<table border="1" />' },
@@ -509,7 +510,7 @@ ruleTester.run('no-unknown-property', rule, {
           data: {
             name: 'onLoad',
             tagName: 'div',
-            allowedTags: 'script, img, link, picture, iframe, object, source',
+            allowedTags: 'script, img, link, picture, iframe, object, source, body',
           },
         },
       ],
