From f8311a963171f89ecdb3f0a93df6a21325bd8226 Mon Sep 17 00:00:00 2001
From: Alex Rudenko <alexrudenko@chromium.org>
Date: Fri, 17 Jan 2025 11:34:12 +0100
Subject: [PATCH] add validation

---
 index.bs | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/index.bs b/index.bs
index 60630315..2e441226 100644
--- a/index.bs
+++ b/index.bs
@@ -9784,6 +9784,10 @@ script=].
 <div algorithm="remote end steps for script.addPreloadScript">
 The [=remote end steps=] given |session| and |command parameters| are:
 
+1. If |command parameters| [=map/contains=] "<code>userContexts</code>"
+   and |command parameters| [=map/contains=] "<code>contexts</code>",
+   return [=error=] with [=error code=] [=invalid argument=].
+
 1. Let |function declaration| be the <code>functionDeclaration</code> field of |command
    parameters|.