Merge branch 'master' into support-shadowroot-handlers

package.json

@@ -24,19 +24,19 @@
     "url": "http://github.com/lukasoppermann/html5sortable/issues"
   },
   "devDependencies": {
-    "@types/jest": "^23.3.1",
+    "@types/jest": "^24.0.0",
     "coveralls": "^3.0.2",
     "eslint": "^5.6.1",
     "eslint-plugin-typescript": "^0.14.0",
     "jest": "^23.5.0",
-    "rollup": "^0.68.0",
+    "rollup": "^1.2.0",
     "rollup-plugin-strip-code": "^0.2.6",
     "rollup-plugin-typescript": "^0.8.1",
     "rollup-plugin-uglify": "^6.0.1",
     "rollup-watch": "^4.3.1",
     "snazzy": "^8.0.0",
     "standard": "^12.0.1",
-    "ts-jest": "^23.1.4",
+    "ts-jest": "^24.0.0",
     "typescript": "^3.1.2",
     "typescript-eslint-parser": "^21.0.0"
   },

src/html5sortable.ts

@@ -255,7 +255,11 @@ export default function sortable (sortableElements, options: object|string|undef
     let customPlaceholder
     if (options.placeholder !== null && options.placeholder !== undefined) {
       let tempContainer = document.createElement(sortableElement.tagName)
-      tempContainer.innerHTML = options.placeholder
+      if (options.placeholder instanceof HTMLElement) {
+        tempContainer.appendChild(options.placeholder)
+      } else {
+        tempContainer.innerHTML = options.placeholder
+      }
       customPlaceholder = tempContainer.children[0]
     }
     // add placeholder