diff --git a/custom/tests.yaml b/custom/tests.yaml
index 947cbd6cb..699ffa394 100644
--- a/custom/tests.yaml
+++ b/custom/tests.yaml
@@ -1568,7 +1568,6 @@ api:
           return instance.getElementsByTagNameNS("http://www.w3.org/1999/xhtml", "*").length > 0;
     requestFullscreen:
       __additional:
-        options_navigationUI_parameter: return bcd.testOptionParam(instance, 'requestFullscreen', 'navigationUI', false);
         returns_promise: |-
           if (!(instance && instance.requestFullscreen)) {
             return {result: false, message: 'instance.requestFullscreen is not defined'};
@@ -2252,6 +2251,16 @@ api:
           throw e;
         }
       }
+  Headers:
+    __additional:
+      lexicographical_sorting: |-
+        if (!('Headers' in self)) {
+          return {result: false, message: 'Headers is not defined'}
+        }
+        var h = new Headers({'X-Framework': 'web2py', 'Content-Type': 'text/xml'});
+        var entry = h.entries().next().value;
+        // If the headers are sorted, the first entry should be 'Content-Type'
+        return entry[0].toLowerCase() === 'content-type';
   History:
     __base: var instance = history;
   HTMLAllCollection:
@@ -3402,6 +3411,18 @@ api:
     __base: var instance = document.body.attributes;
   Navigator:
     __base: var instance = navigator;
+    canShare:
+      __additional:
+        data_files_parameter: return bcd.testOptionParam(instance, 'canShare', 'files', [new File(['foo bar'], 'foo.txt')]);
+        data_text_parameter: return bcd.testOptionParam(instance, 'canShare', 'text', 'foo bar');
+    share:
+      __additional:
+        data_files_parameter: |-
+          // If `canShare` supports the parameter, `share` does
+          return bcd.testOptionParam(instance, 'canShare', 'files', [new File(['foo bar'], 'foo.txt')]);
+        data_text_parameter: |-
+          // If `canShare` supports the parameter, `share` does
+          return bcd.testOptionParam(instance, 'canShare', 'text', 'foo bar');
   Node:
     __base: var instance = document;
   NodeList:
@@ -4780,6 +4801,35 @@ api:
         return {result: false, message: 'crypto is not defined'};
       };
       var instance = crypto.subtle || crypto.webkitSubtle;
+    deriveKey:
+      __additional:
+        derivedKeyAlgorithm_option_aes: |-
+          return instance.generateKey(
+            {
+              name: "ECDH",
+              namedCurve: "P-384",
+            },
+            true,
+            ["deriveKey"],
+          ).then(function(keys) {
+            return instance.deriveKey(
+              {
+                name: "ECDH",
+                public: keys.publicKey,
+              },
+              keys.privateKey,
+              {
+                name: "AES-GCM",
+                length: 256
+              },
+              true,
+              ["encrypt", "decrypt"],
+            );
+          }).then(function() {
+            return true;
+          }).catch(function(e) {
+            return {result: false, message: e.message};
+          });
   SVGAElement:
     __base: var instance = document.createElementNS('http://www.w3.org/2000/svg', 'a');
     __test: return bcd.testObjectName(instance, 'SVGAElement');
diff --git a/untestable-features.jsonc b/untestable-features.jsonc
index cddcb4fe6..3ca3ba299 100644
--- a/untestable-features.jsonc
+++ b/untestable-features.jsonc
@@ -45,6 +45,12 @@
   "api.ExtendableEvent.waitUntil.async_waitUntil",
   "api.Request.mode.navigate_mode",
   "api.PerformanceResourceTiming.deliveryType.navigational-prefetch",
+  "api.IDBRequest.error.DOMException",
+  "api.IDBTransaction.error.DOMException",
+  "api.FileSystemSyncAccessHandle.close.sync_version",
+  "api.FileSystemSyncAccessHandle.flush.sync_version",
+  "api.FileSystemSyncAccessHandle.getSize.sync_version",
+  "api.FileSystemSyncAccessHandle.truncate.sync_version",
 
   /* Effect can be seen, but not programmatically tested */
   "api.console.substitution_strings",
@@ -191,6 +197,9 @@
   "css.properties.text-transform.uppercase_eszett",
   "css.selectors.first-letter.dutch_ij_digraph",
 
+  /* Firefox-only and removed */
+  "api.IDBFactory.open.options_parameter",
+
   // Testable with an overhaul
   /* Worker support; technically already tested, but update-bcd doesn't know how to update these */
   "api.Cache.worker_support",
@@ -320,6 +329,15 @@
   "api.Document.execCommand.cut",
   "api.Document.execCommand.defaultParagraphSeparator",
   "api.Document.execCommand.insertBrOnReturn",
+  "api.Element.requestFullscreen.options_navigationUI_parameter",
+  "api.Element.requestFullscreen.options_screen_parameter",
+
+  /* Requires creating a new worker */
+  "api.SharedWorker.SharedWorker.options_name_parameter",
+  "api.SharedWorker.SharedWorker.mime_checks",
+  "api.Worker.Worker.mime_checks",
+  "api.Worker.Worker.options_name_parameter",
+  "api.Worker.Worker.options_type_parameter",
 
   /* Testing for serializable/transferable objects requires using a worker, which is only available if and when worker tests start */
   "api.RTCDataChannel.transferable",
@@ -327,6 +345,7 @@
   "api.TransformStream.transferable",
   "api.WritableStream.transferable",
   "api.DOMException.serializable_object",
+  "api.Window.postMessage.transfer_parameter",
 
   /* Requires an active registration, which is only available if and when service worker tests start */
   "api.ServiceWorkerRegistration.showNotification.options_actions_parameter",