diff --git a/src/main/resources/hudson/tasks/test/AbstractTestResultAction/show-failures.js b/src/main/resources/hudson/tasks/test/AbstractTestResultAction/show-failures.js
new file mode 100644
index 000000000..bd84bb7ad
--- /dev/null
+++ b/src/main/resources/hudson/tasks/test/AbstractTestResultAction/show-failures.js
@@ -0,0 +1,33 @@
+/**
+* Displays all the tests failures, and hides the link allowing to display them from UI.
+*/
+function showFailures() {
+    // Displaying all the hidden elements from the page (those are the failed tests)
+    let hiddenElements = document.getElementsByClassName("hidden");
+
+    // DEV MEMO:
+    // hiddenElements is not an array but an HTMLCollection.
+    // To allow using forEach, we need an array, so I'm using the spread operator below to get that.
+    [...hiddenElements].forEach(element => { element.style.display = ""; });
+
+    // Now hiding the link from UI allowing to show all failed tests
+    let showFailuresLink = document.getElementById("showLink");
+    showFailuresLink.style.display = "none";
+}
+
+// Adding an onclick listener to the link in UI allowing to display all failed tests
+// DEV MEMO:
+// We are doing it after DOM content is loaded as a good practice to ensure we are not slowing down
+// the page rendering. In that particular situation the addition of the onclick handler shouldn't
+// really impact the page performances, but rather stick with good practices.
+
+document.addEventListener('DOMContentLoaded', (event) => {
+
+  // Retrieving the link from UI allowing to show all failed tests
+  // Note: we are retrieving the link by its ID to match how it was already done
+  // in the showFailures method above.
+  const showFailuresLink = document.getElementById("showLink");
+
+  showFailuresLink.onclick = (_) => showFailures();
+
+});
diff --git a/src/main/resources/hudson/tasks/test/AbstractTestResultAction/summary.jelly b/src/main/resources/hudson/tasks/test/AbstractTestResultAction/summary.jelly
index a06c09509..382400558 100644
--- a/src/main/resources/hudson/tasks/test/AbstractTestResultAction/summary.jelly
+++ b/src/main/resources/hudson/tasks/test/AbstractTestResultAction/summary.jelly
@@ -26,17 +26,7 @@ THE SOFTWARE.
 <?jelly escape-by-default='true'?>
 <j:jelly xmlns:j="jelly:core" xmlns:st="jelly:stapler" xmlns:d="jelly:define" xmlns:l="/lib/layout" xmlns:t="/lib/hudson" xmlns:test="/lib/hudson/test" xmlns:f="/lib/form" xmlns:i="jelly:fmt">
 
-  <script type="text/javascript">
-    function showFailures() {
-
-    var elms = document.getElementsByClassName("hidden");
-    for(var i = 0; i &lt; elms.length; i++) {
-    elms[i].style.display = "";
-    }
-    elm = document.getElementById("showLink");
-    elm.style.display = "none";
-    }
-  </script>
+  <st:adjunct includes="hudson.tasks.test.AbstractTestResultAction.show-failures" />
 
   <!-- summary -->
   <t:summary icon="clipboard.png">
@@ -75,8 +65,7 @@ THE SOFTWARE.
       <!-- Show failures link -->
       <j:if test="${displayedCount &lt; failedTests.size() }">
         <a id="showLink" name="editFailuresLink"
-           href="#showFailuresLink"
-           onclick="javascript:showFailures()">${%Show all failed tests} ${">>>"}</a>
+           href="#showFailuresLink">${%Show all failed tests} ${">>>"}</a>
       </j:if>
     </j:if>