diff --git a/queries/html_tags/injections.scm b/queries/html_tags/injections.scm
index e8926b6b8..9e02fc21b 100644
--- a/queries/html_tags/injections.scm
+++ b/queries/html_tags/injections.scm
@@ -66,3 +66,10 @@
       (attribute_value) @regex
     ] (#eq? @_attr "pattern")))
 ))
+
+; <input type="checkbox" onchange="this.closest('form').elements.output.value = this.checked">
+(attribute
+  (attribute_name) @_name
+  (#lua-match? @_name "^on[a-z]+$")
+  (#offset! @javascript 0 1 0 -1)
+  (quoted_attribute_value) @javascript)