I'm going to say that Javascript is written to prevent you from doing that. 
Javascript sandboxes their commands and functions so that only certain ones are 
visible from outside the applications "sandbox". They call it Scope and 

Here is a good article on it which helped me understand why I could not access 
certain commands and functions outside Acrobat: 


If you can set a username and password in a web page javascript control, then 
you can probably GET them too. The reason why plugins like password managers 
work is because they operate inside the context of the browser application 
itself. Of course, all of my posts are subject to scrutiny and correction. 

Bob S

> On Jul 31, 2018, at 11:03 , Tom Glod via use-livecode 
> <use-livecode@lists.runrev.com> wrote:
> Hi Peeps, can anyone clarify for me if its possible to have a browser
> widget on a card and send javascript commands to it?
> Can I for example put text (login & password) into fields on the page if I
> know the names of the field controls?
> Can I trigger the login button?
> Looking for workarounds for the lack of cookie support in the browser
> widget. (so i'm trying to do auto login)
> Unless it does support cookies?!?!!? Will it ever?
> Thank you.

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