code: func newPlainTextInner(ln *line, rslt *result, src *source, parent element, insertBr bool, opts *Options) *plainTextInner {
  	return &plainTextInner{
  		elementBase: newElementBase(ln, rslt, src, parent, opts),
  		insertBr:    insertBr,
  	}
  }
docs: // newPlainTextInner creates and returns a plain text.