Prefiling mailto URL for gmail - with from and html body parameters

Question

here I found of how to formulate an URL to open a compose popup window in gmail

Prefilling gmail compose screen with HTML text

it works great, but I want to go 2 steps further

1. I'd like to set FROM parameter. Since in my gmail account I have the option to select from which email I'd like to send... I would like to preset this if possible

2. I would like to do some basic HTML formatting in my body parameter...if I just add text it doesn't work

Answer 1

I know for certain no HTML in the body: Is it possible to add an HTML link in the body of a MAILTO link

The hunt for a from parameter is ongoing...