Where derive from these syntax, [nbsp] and more?

Hi,

This is a simple question not for asking some trouble.

Contao has a few syntax using "[" and "]"; [&], [&amp], [lt], [gt], [nbsp] and [-] from TYPOlight era.
Where they came from? TYPOlight original invention??

Best regards.

Don't know where they come from but if you search in core files for
preserveBasicEntities
https://github.com/contao/core/blob/...Input.php#L698
restoreBasicEntities
https://github.com/contao/core/blob/...gUtil.php#L251
maybe you will find out.

Thank you for your reply.

Yes, I already know these code fragments. :)
AFAIK, it looks like investigation of Contao (or TYPOlight).

Anyway, I think it should be documented to docs.contao.org...

Yes, I agree. Perhaps someone else can enlighten us.