diff --git a/pkgs/test/CHANGELOG.md b/pkgs/test/CHANGELOG.md
index 57d6de9..30b4d5e 100644
--- a/pkgs/test/CHANGELOG.md
+++ b/pkgs/test/CHANGELOG.md
@@ -3,6 +3,8 @@
 * Add an `--ignore-timeouts` command line flag, which disables all timeouts
   for all tests. This can be useful when debugging, so tests don't time out
   during debug sessions.
+* Create a trusted types policy when available for assigning the script URL for
+  web tests.
 
 ## 1.19.5
 
diff --git a/pkgs/test/lib/dart.js b/pkgs/test/lib/dart.js
index 54329ca..9b49485 100644
--- a/pkgs/test/lib/dart.js
+++ b/pkgs/test/lib/dart.js
@@ -52,7 +52,14 @@
 
 var script = document.createElement('script');
 
-script.src = link.href + '.browser_test.dart.js';
+if (typeof trustedTypes !== 'undefined') {
+  const sanitizer = trustedTypes.createPolicy('dart#test', {
+    createScriptURL: (input) => input + '.browser_test.dart.js'
+  });
+  script.src = sanitizer.createScriptURL(link.href);
+} else {
+  script.src = link.href + '.browser_test.dart.js';
+}
 
 script.onerror = function(event) {
   var message = "Failed to load script at " + script.src +