Correct issue SortableJS#53

Author: David-Desmaisons

src/util/tags.js

@@ -127,7 +127,12 @@ function isTransition(name) {
 }
 
 function isHtmlAttribute(value) {
-  return ["id", "class", "role", "style"].includes(value) || value.startsWith("data-") || value.startsWith("aria-");
+  return (
+    ["id", "class", "role", "style"].includes(value) ||
+    value.startsWith("data-") ||
+    value.startsWith("aria-") ||
+    value.startsWith("on")
+  );
 }
 
 export { isHtmlTag, isHtmlAttribute, isTransition };

tests/unit/util/tags.spec.js

@@ -24,6 +24,8 @@ describe("isHtmlAttribute", () => {
     ["role", true],
     ["data-whatever", true],
     ["aria-whatever", true],
+    ["onclick", true],
+    ["onAnything", true],
     ["style", true],
     ["notattribute", false],
     ["href", false],