I saw {# ... #} syntax used to comment out things in an HTML template. This is, as far as I know, not a part of "vanilla" HTML. What is this syntax from and in what contexts is it valid?
[Edit] Follow-up question. How would I google for the answer to this? I tried putting the syntax in quotes but that did not work.
Looks like a comment in Jinja templating engine https://jinja.palletsprojects.com
As seen here: https://jinja.palletsprojects.com/en/3.0.x/templates/#comments