In the post, as I tried to capture in the title submitted, I outline my journey of exploration, when I became determined to make GitHub-Flavored Markdown display my text, with color, style and alignment of my choosing, which as I discovered after setting out to do so, the inability to do such a thing outside of fenced blocks with pre-defined syntax highlighting is a well-known condition, which is met with "works as intended" response because, well, GitHub doesn't want their repos looking like MySpace or Geocities or presenting security risk exposure by allowing arbitrary html/CSS styling. Sure, I should have used GitHub Pages to build a page from my Markdown using Jekyll, which is a supported way to control the styling of your own documents in your repo, but where's the fun in that?
The linked post documents the workaround I arrived at, which became an output target format that nobody has ever asked for from my ASCII line-Art diagramming tool. I thought some here might appreciate the documentation of "wasting my time so you don't have to" on a technical solution for a problem I probably just shouldn't have cared about and moved on.