From 19cb2ebfb47f6e44db012747f0fa6622a5df66c6 Mon Sep 17 00:00:00 2001
From: Ivan Hofer <ivan.hofer@outlook.com>
Date: Sun, 9 Jan 2022 12:06:18 +0100
Subject: [PATCH] document why there could be multiple documents

---
 src/runtime/internal/style_manager.ts | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/runtime/internal/style_manager.ts b/src/runtime/internal/style_manager.ts
index e44fccce28..6907e5af02 100644
--- a/src/runtime/internal/style_manager.ts
+++ b/src/runtime/internal/style_manager.ts
@@ -6,6 +6,8 @@ interface StyleInformation {
 	rules: Record<string, true>;
 }
 
+// we need to store the information for multiple documents because a Svelte application could also contain iframes
+// https://github.com/sveltejs/svelte/issues/3624
 const managed_styles = new Map<Document | ShadowRoot, StyleInformation>();
 let active = 0;