@startuml  analysis2
skinparam handwritten true
skinparam monochrome true
skinparam packageStyle rect
skinparam defaultFontName FG Virgil
skinparam shadowing false

actor User

User -> Browser : open the javascript option
Browser --> User : shows the javascript input box
User -> Browser : writes an exisiting function
Browser -> Browser : verify if the function exists
Browser --> User: run the choosen function


@enduml