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HTML might be getting a new type of tag, which… hasn't happened this millennium. Here's the new syntax, and how it works:

Doesn’t harm to link to more of the relevant issues and explainers here, I guess.

By the way, besides that issue I learned of these plans after becoming curious about this Intent to Prototype by Blink:

I vaguely remember a thread in the early stages of HTML5 discussions and WHATWG formation that dealt with comment syntax, e.g. about the SGML rule that allowed `<!-- comment -- no comment -- comment again -->` in theory and how to handle stuff like `<!>`, which I had been using as a Todo marker.