How To Fork and Implement Highlighter / Hilite

[volomike]

It's now becoming common to see the double equal sign around something in many variations of Markdown to indicate a highlighted section, such as:

You should ==always remember this==.

And that would display with <mark> wraparound on that, meaning often a yellow highlighter background color unless overridden by CSS.

It would be nice if CommonMark would implement a plugin system where this could be added, as well as a way to protect this from impacting any <code> or <pre> blocks that were set up with backticks.