diff --git a/Libraries/LibWeb/IndexedDB/IDBTransaction.cpp b/Libraries/LibWeb/IndexedDB/IDBTransaction.cpp
index 7cca446090f..6e58b3ba56c 100644
--- a/Libraries/LibWeb/IndexedDB/IDBTransaction.cpp
+++ b/Libraries/LibWeb/IndexedDB/IDBTransaction.cpp
@@ -103,4 +103,19 @@ GC::Ref<HTML::DOMStringList> IDBTransaction::object_store_names()
     return create_a_sorted_name_list(realm(), names);
 }
 
+// https://w3c.github.io/IndexedDB/#dom-idbtransaction-commit
+WebIDL::ExceptionOr<void> IDBTransaction::commit()
+{
+    auto& realm = this->realm();
+
+    // 1. If this's state is not active, then throw an "InvalidStateError" DOMException.
+    if (m_state != TransactionState::Active)
+        return WebIDL::InvalidStateError::create(realm, "Transaction is not active while commiting"_string);
+
+    // 2. Run commit a transaction with this.
+    commit_a_transaction(realm, *this);
+
+    return {};
+}
+
 }
diff --git a/Libraries/LibWeb/IndexedDB/IDBTransaction.h b/Libraries/LibWeb/IndexedDB/IDBTransaction.h
index 194d40c7023..bc5af18a485 100644
--- a/Libraries/LibWeb/IndexedDB/IDBTransaction.h
+++ b/Libraries/LibWeb/IndexedDB/IDBTransaction.h
@@ -44,6 +44,7 @@ public:
     [[nodiscard]] GC::Ptr<IDBRequest> associated_request() const { return m_associated_request; }
     [[nodiscard]] bool aborted() const { return m_aborted; }
     [[nodiscard]] GC::Ref<HTML::DOMStringList> object_store_names();
+    [[nodiscard]] RequestList& request_list() { return m_request_list; }
     [[nodiscard]] ReadonlySpan<GC::Ref<ObjectStore>> scope() const { return m_scope; }
     [[nodiscard]] String uuid() const { return m_uuid; }
 
@@ -59,6 +60,7 @@ public:
     [[nodiscard]] bool is_finished() const { return m_state == TransactionState::Finished; }
 
     WebIDL::ExceptionOr<void> abort();
+    WebIDL::ExceptionOr<void> commit();
 
     void set_onabort(WebIDL::CallbackType*);
     WebIDL::CallbackType* onabort();
diff --git a/Libraries/LibWeb/IndexedDB/IDBTransaction.idl b/Libraries/LibWeb/IndexedDB/IDBTransaction.idl
index c343a328ab3..667d36a6cdd 100644
--- a/Libraries/LibWeb/IndexedDB/IDBTransaction.idl
+++ b/Libraries/LibWeb/IndexedDB/IDBTransaction.idl
@@ -10,7 +10,7 @@ interface IDBTransaction : EventTarget {
     [SameObject, ImplementedAs=connection] readonly attribute IDBDatabase db;
     readonly attribute DOMException? error;
     [FIXME] IDBObjectStore objectStore(DOMString name);
-    [FIXME] undefined commit();
+    undefined commit();
     undefined abort();
     
     attribute EventHandler onabort;
diff --git a/Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp b/Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp
index abfe6d31b8d..4b325a9fab8 100644
--- a/Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp
+++ b/Libraries/LibWeb/IndexedDB/Internal/Algorithms.cpp
@@ -14,6 +14,7 @@
 #include <LibJS/Runtime/VM.h>
 #include <LibWeb/DOM/EventDispatcher.h>
 #include <LibWeb/HTML/EventNames.h>
+#include <LibWeb/HTML/Scripting/TemporaryExecutionContext.h>
 #include <LibWeb/IndexedDB/IDBDatabase.h>
 #include <LibWeb/IndexedDB/IDBRequest.h>
 #include <LibWeb/IndexedDB/IDBTransaction.h>
@@ -22,6 +23,7 @@
 #include <LibWeb/IndexedDB/Internal/ConnectionQueueHandler.h>
 #include <LibWeb/IndexedDB/Internal/Database.h>
 #include <LibWeb/Infra/Strings.h>
+#include <LibWeb/Platform/EventLoopPlugin.h>
 #include <LibWeb/StorageAPI/StorageKey.h>
 #include <LibWeb/WebIDL/AbstractOperations.h>
 #include <LibWeb/WebIDL/Buffers.h>
@@ -706,4 +708,60 @@ GC::Ref<HTML::DOMStringList> create_a_sorted_name_list(JS::Realm& realm, Vector<
     return HTML::DOMStringList::create(realm, names);
 }
 
+// https://w3c.github.io/IndexedDB/#commit-a-transaction
+void commit_a_transaction(JS::Realm& realm, GC::Ref<IDBTransaction> transaction)
+{
+    // 1. Set transaction’s state to committing.
+    transaction->set_state(IDBTransaction::TransactionState::Committing);
+
+    dbgln_if(IDB_DEBUG, "commit_a_transaction: transaction {} is committing", transaction->uuid());
+
+    // 2. Run the following steps in parallel:
+    Platform::EventLoopPlugin::the().deferred_invoke(GC::create_function(realm.heap(), [&realm, transaction]() {
+        HTML::TemporaryExecutionContext context(realm, HTML::TemporaryExecutionContext::CallbacksEnabled::Yes);
+
+        // 1. Wait until every item in transaction’s request list is processed.
+        HTML::main_thread_event_loop().spin_until(GC::create_function(realm.vm().heap(), [transaction]() {
+            if constexpr (IDB_DEBUG) {
+                dbgln("commit_a_transaction: waiting for step 1");
+                dbgln("requests in queue:");
+                for (auto const& request : transaction->request_list()) {
+                    dbgln("  - {} = {}", request->uuid(), request->processed() ? "processed"sv : "not processed"sv);
+                }
+            }
+
+            return transaction->request_list().all_requests_processed();
+        }));
+
+        // 2. If transaction’s state is no longer committing, then terminate these steps.
+        if (transaction->state() != IDBTransaction::TransactionState::Committing)
+            return;
+
+        // FIXME: 3. Attempt to write any outstanding changes made by transaction to the database, considering transaction’s durability hint.
+        // FIXME: 4. If an error occurs while writing the changes to the database, then run abort a transaction with transaction and an appropriate type for the error, for example "QuotaExceededError" or "UnknownError" DOMException, and terminate these steps.
+
+        // 5. Queue a task to run these steps:
+        HTML::queue_a_task(HTML::Task::Source::DatabaseAccess, nullptr, nullptr, GC::create_function(transaction->realm().vm().heap(), [transaction]() {
+            // 1. If transaction is an upgrade transaction, then set transaction’s connection's associated database's upgrade transaction to null.
+            if (transaction->is_upgrade_transaction())
+                transaction->connection()->associated_database()->set_upgrade_transaction(nullptr);
+
+            // 2. Set transaction’s state to finished.
+            transaction->set_state(IDBTransaction::TransactionState::Finished);
+
+            // 3. Fire an event named complete at transaction.
+            transaction->dispatch_event(DOM::Event::create(transaction->realm(), HTML::EventNames::complete));
+
+            // 4. If transaction is an upgrade transaction, then let request be the request associated with transaction and set request’s transaction to null.
+            if (transaction->is_upgrade_transaction()) {
+                auto request = transaction->associated_request();
+                request->set_transaction(nullptr);
+
+                // Ad-hoc: Clear the two-way binding.
+                transaction->set_associated_request(nullptr);
+            }
+        }));
+    }));
+}
+
 }
diff --git a/Libraries/LibWeb/IndexedDB/Internal/Algorithms.h b/Libraries/LibWeb/IndexedDB/Internal/Algorithms.h
index 09a33be3f48..7d7540e5fe7 100644
--- a/Libraries/LibWeb/IndexedDB/Internal/Algorithms.h
+++ b/Libraries/LibWeb/IndexedDB/Internal/Algorithms.h
@@ -27,5 +27,6 @@ void abort_a_transaction(GC::Ref<IDBTransaction>, GC::Ptr<WebIDL::DOMException>)
 JS::Value convert_a_key_to_a_value(JS::Realm&, GC::Ref<Key>);
 bool is_valid_key_path(KeyPath const&);
 GC::Ref<HTML::DOMStringList> create_a_sorted_name_list(JS::Realm&, Vector<String>);
+void commit_a_transaction(JS::Realm&, GC::Ref<IDBTransaction>);
 
 }