Electrical Engineering needs a Markdown solution for overline

Question

The introduction of tables was a great addition to the Electrical Engineering substack, since I often want to quote tables from electronic component datasheets. An actual table is far more functional than a screenshot of a table even if it often takes up more room.

But now that I start converting screenshots into real tables I see a pressing need to render text with overline which is used to denote that a signal is inverted. It is very common when discussing topics in electrical engineering, and I have not found a way to do it on Stack Exchange.

Here is an example of what I want to achieve. Note the bar over the text CS/LD in the first column:

According to the answers to the question Is there a way to overline text in (GitHub flavoured) Markdown? there could be two or three ways to solve this, but I've found that neither works well.

text-decoration:overline

Quoted: <span style="text-decoration:overline">RESET</span> Rendered: RESET

This would be the preferred method, but it seems to be filtered out by the renderer and I can't see why. The quote from We're switching to CommonMark seems to be false:

I’ve prepared a feature that will swap out our current, home-grown Markdown renderers with well-tested open-source implementations that adhere to the CommonMark specification. For the curious: this means we’re replacing PageDown with markdown-it on the client side and MarkdownSharp with markdig on the server side.

markdig's output on Babelmark renders this correctly. So does the CommonMark reference implementation.

markdown-it strips HTML tags by default, but the output on Babelmark does not look like the preview here.

Unicode Combining Overline

Unicode lets you add a Combining Overline to each character, but this is not optimal:

• They are designed to modify a single letter and will create gaps when used for a word
• Rendering seems to be implementation defined and also utterly broken on some systems: Why is Unicode combining character order different between IDEA and Chrome?

MathJax

Where MathJax is enabled you can use something like $\rm\overline{RESET}$. This changes the font, adds a lot of unnecessary complexity, and only works on a few select sites.