Ahhhhh @sam, thank you for the redirection. The current functionality is PERFECT, if I’m understanding correctly now.
Let’s see if I’ve got this right…
- “x” represents “auto”
- if I use “x” before number it will represent width. e.g.
x150
="width: auto; height: 150px;"
- if I use “x” after a number it will represent height. e.g.
150x
="width: 150px; height: auto;"
––––––––––––––––––––––––––––––––––––
Let’s test that out with this image that is "width:600px; height: 200px;"
The default embed syntax is:

which looks like…
The following image has been scaled to a width of 200px (height = x = auto):

which looks like:
The following image has been scaled to a height of 100px (width = x = auto):

which looks like:
––––––––––––––––––––––––––––––––––––
That seems to be working like a charm. So glad to understand, and now be able to use this!
Thanks @sam for the quick response!