UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36

Steps to reproduce the problem:
1. connect to website with already saved password
2. open console
3. type $("[type=password]")[0].type = "text";
4. password became visible

What is the expected behavior?
i expected that for security reason paswword input should be cleared once we changed the type

What went wrong?
security is not good

Did this work before? N/A 

Chrome version: 54.0.2840.71  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 27.0 r0