diff --git a/docs/api-reference/browser_javascript.md b/docs/api-reference/browser_javascript.md
index f3cd32dcc74..daa87f3c907 100644
--- a/docs/api-reference/browser_javascript.md
+++ b/docs/api-reference/browser_javascript.md
@@ -58,9 +58,10 @@ class SoundEffectState(rx.State):
 
 def sound_effect_demo():
     return rx.hstack(
-        rx.script("""
-            var button_sfx = new Audio("/vintage-button-sound-effect.mp3")
-            function playFromStart (sfx) {sfx.load(); sfx.play()}"""),
+        rx.script(
+            f'var button_sfx = new Audio("{rx.asset("vintage-button-sound-effect.mp3")}");'
+            " function playFromStart(sfx) {sfx.load(); sfx.play()}"
+        ),
         rx.button(
             "Play Immediately", on_click=rx.call_script("playFromStart(button_sfx)")
         ),
diff --git a/docs/app/news/+sound-demo-asset.bugfix.md b/docs/app/news/+sound-demo-asset.bugfix.md
new file mode 100644
index 00000000000..c8aa3133d6c
--- /dev/null
+++ b/docs/app/news/+sound-demo-asset.bugfix.md
@@ -0,0 +1 @@
+Fix the inline-script sound demo on the browser JavaScript page, whose audio file resolved to a 404 because the site is served under `/docs`.
diff --git a/docs/app/tests/test_browser_javascript_demo.py b/docs/app/tests/test_browser_javascript_demo.py
new file mode 100644
index 00000000000..a24535f8aef
--- /dev/null
+++ b/docs/app/tests/test_browser_javascript_demo.py
@@ -0,0 +1,33 @@
+"""Regression coverage for the browser JavaScript page's inline-script demo."""
+
+from pathlib import Path
+
+import pytest
+import reflex as rx
+from reflex_base.registry import RegistrationContext
+
+from reflex_docs.docgen_pipeline import render_docgen_document
+
+DOCS = Path(__file__).resolve().parents[2]
+
+
+@pytest.fixture(autouse=True)
+def isolated_registration():
+    """Keep the demo's state class out of the shared registries other tests use."""
+    with RegistrationContext(
+        _config=rx.Config(app_name="reflex_docs", frontend_path="/docs")
+    ):
+        yield
+
+
+def test_sound_demo_audio_resolves_under_frontend_path():
+    """The sound effect URL carries the /docs mount, so the file is not a 404."""
+    # A test-specific virtual path keeps the demo's state class from colliding
+    # with the one test_docgen_double_eval registers for the real page.
+    body, _ = render_docgen_document(
+        "docs/api-reference/browser_javascript_sound_test.md",
+        str(DOCS / "api-reference" / "browser_javascript.md"),
+    )
+    rendered = str(body)
+    assert "/docs/vintage-button-sound-effect.mp3" in rendered
+    assert 'new Audio("/vintage-button-sound-effect.mp3")' not in rendered