diff --git a/Userland/Libraries/LibWeb/HTML/SourceSnapshotParams.h b/Userland/Libraries/LibWeb/HTML/SourceSnapshotParams.h
new file mode 100644
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+++ b/Userland/Libraries/LibWeb/HTML/SourceSnapshotParams.h
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+/*
+ * Copyright (c) 2023, Aliaksandr Kalenik <kalenik.aliaksandr@gmail.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibWeb/HTML/PolicyContainers.h>
+#include <LibWeb/HTML/SandboxingFlagSet.h>
+
+namespace Web::HTML {
+
+// https://html.spec.whatwg.org/multipage/browsing-the-web.html#source-snapshot-params
+struct SourceSnapshotParams {
+    // a boolean
+    bool has_transient_activation;
+
+    // a sandboxing flag set
+    SandboxingFlagSet sandboxing_flags;
+
+    // a boolean
+    bool allows_downloading;
+
+    // an environment settings object, only to be used as a request client
+    JS::GCPtr<EnvironmentSettingsObject> fetch_client;
+
+    // a policy container
+    PolicyContainer source_policy_container;
+};
+
+}