Codebase Browser
chromium
Go to App

chromium/ash/webui/sample_system_web_app_ui/resources/trusted/share.html 

<!-- Copyright 2022 The Chromium Authors
     Use of this source code is governed by a BSD-style license that can be
     found in the LICENSE file. -->
<!DOCTYPE html>
<meta charset="utf-8">
<title>Sample System Web App share target</title>
<header id='title'>Share Target</header>