chromium/chrome/test/data/extensions/api_test/content_scripts/duplicate_script_injection/should_run_once.js

// Copyright 2016 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

var should_be_injected_once = document.createElement('div');
should_be_injected_once.className = 'injected-once';
document.body.appendChild(should_be_injected_once);