diff --git a/lighthouse-core/report/html/report-styles.css b/lighthouse-core/report/html/report-styles.css
index 452b3ed92ce1..44efd2618d23 100644
--- a/lighthouse-core/report/html/report-styles.css
+++ b/lighthouse-core/report/html/report-styles.css
@@ -148,6 +148,11 @@
   display: none !important;
 }
 
+/* Edge doesn't recognize these, and the polyfill doesn't set block. https://github.com/javan/details-element-polyfill/issues/13 */
+details, summary {
+  display: block;
+}
+
 .lh-root details > summary {
   cursor: pointer;
 }
diff --git a/lighthouse-core/report/html/third_party/details-element-polyfill.js b/lighthouse-core/report/html/third_party/details-element-polyfill.js
index ab768957fc91..c7520c76e48c 100644
--- a/lighthouse-core/report/html/third_party/details-element-polyfill.js
+++ b/lighthouse-core/report/html/third_party/details-element-polyfill.js
@@ -3,10 +3,6 @@ Details Element Polyfill 2.0.4
 Copyright © 2018 Javan Makhmali
  */
 
-(function() {
-
-
-}).call(this);
 (function() {
   var addAttributesForSummary, eventIsSignificant, findClosestElementWithTagName, findElementsWithTagName, onTogglingTrigger, polyfillFocusAndARIA, polyfillProperties, polyfillStyles, polyfillToggle, polyfillToggleEvent, support, triggerToggle, triggerToggleIfToggled;
 
@@ -290,8 +286,4 @@ Copyright © 2018 Javan Makhmali
     polyfillToggleEvent();
   }
 
-}).call(this);
-(function() {
-
-
 }).call(this);