Merge pull request #5487 from Polymer/shadydom-upgrade

Use `ShadyDOM.attachDom`
Polymer · Apr 19, 2019 · 176c001 · 176c001
2 parents 8f4cc31 + 002a431
commit 176c001
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Showing 3 changed files with 132 additions and 132 deletions.
diff --git a/lib/mixins/element-mixin.js b/lib/mixins/element-mixin.js
@@ -672,9 +672,9 @@ export const ElementMixin = dedupingMixin(base => {
       if (n.attachShadow) {
         if (dom) {
           if (!n.shadowRoot) {
-            n.attachShadow({mode: 'open'});
+            n.attachShadow({mode: 'open', shadyUpgradeFragment: dom});
+            n.shadowRoot.appendChild(dom);
           }
-          n.shadowRoot.appendChild(dom);
           if (syncInitialRender && window.ShadyDOM) {
             ShadyDOM.flushInitial(n.shadowRoot);
           }