Split the contents of the first allowed element in pre into one
span per line (denoted source by \n). Each individual line is
wrapped using [makeLine], which also nests another -contentspan inside the main span. The line number is stored in the
data-line attribute of the outer span. The containing element
gains a data-digits attribute. options will be shallowly merged
with DEFAULT_OPTIONS.
Split the contents of the first allowed element in
preinto onespanper line (denoted source by\n). Each individual line is wrapped using [makeLine], which also nests another-contentspaninside the mainspan. The line number is stored in thedata-lineattribute of the outerspan. The containing element gains adata-digitsattribute.optionswill be shallowly merged withDEFAULT_OPTIONS.