diff --git a/lib/rules/no-unknown-property.js b/lib/rules/no-unknown-property.js
index adb2b77f0c..8b9eeea895 100644
--- a/lib/rules/no-unknown-property.js
+++ b/lib/rules/no-unknown-property.js
@@ -68,8 +68,8 @@ const ATTRIBUTE_TAGS_MAP = {
   onEmptied: ['audio', 'video'],
   onEncrypted: ['audio', 'video'],
   onEnded: ['audio', 'video'],
-  onError: ['audio', 'video', 'img', 'link', 'source', 'script'],
-  onLoad: ['script', 'img', 'link'],
+  onError: ['audio', 'video', 'img', 'link', 'source', 'script', 'iframe'],
+  onLoad: ['script', 'img', 'link', 'iframe'],
   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
index 3025d20d74..ac37872691 100644
--- a/tests/lib/rules/no-unknown-property.js
+++ b/tests/lib/rules/no-unknown-property.js
@@ -400,7 +400,7 @@ ruleTester.run('no-unknown-property', rule, {
           data: {
             name: 'onError',
             tagName: 'div',
-            allowedTags: 'audio, video, img, link, source, script',
+            allowedTags: 'audio, video, img, link, source, script, iframe',
           },
         },
       ],
@@ -413,7 +413,7 @@ ruleTester.run('no-unknown-property', rule, {
           data: {
             name: 'onLoad',
             tagName: 'div',
-            allowedTags: 'script, img, link',
+            allowedTags: 'script, img, link, iframe',
           },
         },
       ],