RDS base on webserver

Guys do is any solution base on html5 who allows clientless REMOTE DESKTOP using only webbrowser?.
Simple scenery you got some new client/person who need our help and you need to make some Remote desktop to his PC. LogmeIn, teamviewer etc.
Client have AD restriction and is only “user” on His computer so He can’t install any new Remote desktop software.
Solution like chrome remote desktop is nice but also require this specific browser and add new plugins.
So for example we ask client to go to our webpage->webserver like Guacamole( I know this is more like gateway for REMOTE desktop/CMD/TELNET/SSH) who allow us to see what is on his PC.
Do any clientless solution exist?