@tpartner : i think it can help for JS : what it's your idea about XY code ?
ls-code-{QXCODE}{QYCODE} (same than EM but without the SQG}
or
ls-code-{QCODE} for each scale ?

PS : no-answer have the class
.ls-code-

Other :
.ls-code--oth- ?
But there are already other-item (else it's a minor bug)

@DenisChenu, I would go with your first suggestion resembling the EM identifier, however, for CSS consistency, I would use all dashes instead of underscores:
ls-code-{QXCODE}-{QYCODE}

I agree with no-answer and other, after all, those are the values of the inputs.

Yes : value or input OR ending value of column (other / comment for example)

For dash VS underscore : EM use underscore .... then i vote for underscore.

It's (finally) for multiple : ls-code-{EMCODE} for subquestion

No better choice, 2 twos have Pros and Cond

No time actually, and don't seems really needed : we already have some way to select specific part etc ....

Can be cool , but not major feature