device-to device mode test code example
Example: chrome toggle device toolbar not working
<meta name="viewport" content="width=device-width">
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1" />
<meta name="viewport" content="width=device-width">
<meta name="viewport" content="width=device-width, initial-scale=1, minimum-scale=1" />