Question About custom BBCODE

BOX: Wrap text or in the box, in additional, customize the area with a background
BGIMG: Background img for page or post. Options are repeat, repeat-x, repeat-y, fixed.
SZIMG: customize width and height for an img
Hover: css hover code
Justify: Justify the text in the area.
Clear: css clear code
Float: Float text right or left.
Background Color: Customize background color for a text, or object.
Background Color 2: Customize background, height and width for text, or object.
Limit: Limit the size of the area (in pixel)
LimitR: Limit the size of the area (in pixel), then float it right
Margin: Append margin (in pixel) to the text or object.
Height: Specify the height of object (in pixel)

This is mostly only supported in ASFv1 but some of the elements are still being supported in ASFv2.

I've reconstructed an old sample post:

https://www.anime-sharing.com/threads/checkmates-bbcode-workshop.282626/#post-6982257

Regrettably, it seems that the BGIMG and several other BBCode elements were removed because of their complexity, it would have been really nice otherwise.

It's best to avoid excessive use of complex BBCode, as we've moved well beyond the dinosaur age. While the old BBCode is still available as a legacy feature for now, it will eventually become obsolete—though that may take several more years.