From dafe8bb06ea40aef958d41a1aae54b89d83e9be3 Mon Sep 17 00:00:00 2001
From: Matt Huebert <mhuebert@gmail.com>
Date: Thu, 12 Sep 2024 11:40:40 +0200
Subject: [PATCH] add "part" attribute to treescope_root

This allows external CSS rules to target the content of treescope shadow node
---
 treescope/lowering.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/treescope/lowering.py b/treescope/lowering.py
index cdfa44c..bc17793 100644
--- a/treescope/lowering.py
+++ b/treescope/lowering.py
@@ -321,6 +321,7 @@ def _render_one(
     classnames += " roundtrip_mode"
   stream.write(
       f'<div class="{classnames}" tabindex="0" '
+      'part="treescope_root" '
       'onkeydown="this.getRootNode().host.defns'
       '.toggle_root_roundtrip(this, event)">'
   )