LaunchAgent to launch Safari in full screen mode and connect to http://www.google.com. Note, not currently working properly; work in progress.

gistfile1.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>KeepAlive</key>
	<false/>
	<key>Label</key>
	<string>com.company.safari_kiosk</string>
	<key>ProgramArguments</key>
	<array>
		<string>/usr/bin/osascript</string>
		<string>-e</string>
		<string>tell application </string>
		<string>Safari""</string>
		<string>-e</string>
		<string>activate</string>
		<string>-e</string>
		<string>tell application </string>
		<string>System</string>
		<string>Events""</string>
		<string>-e</string>
		<string>keystroke </string>
		<string>f"</string>
		<string>using</string>
		<string>{control</string>
		<string>down,</string>
		<string>command</string>
		<string>down}"</string>
		<string>-e</string>
		<string>tell application </string>
		<string>Safari"</string>
		<string>to</string>
		<string>open</string>
		<string>location</string>
		<string>http://www.google.com</string>
		<string>-e </string>
		<string>end</string>
		<string>tell"</string>
		<string>-e</string>
		<string>end tell</string>
	</array>
	<key>QueueDirectories</key>
	<array/>
	<key>RunAtLoad</key>
	<true/>
	<key>WatchPaths</key>
	<array/>
</dict>
</plist>