Limited support
 This feature is only present in Portal 2: Community Edition and Portal: Revolution. mv_duckjump
🟦 Executable on Client
mv_duckjump <value>
Enables jumping while ducked.
Warning:
 
This is a cheat command and can only be used when sv_cheats  is set to 1.
Note:
 The value is synced between the server and all clients.