the unique non-ambiguous order defined by the formal grammar
/* Keyword value */
/* <string> values */
quotes: "«" "»"; /* Set open-quote and close-quote to the French quotation marks */
quotes: "«" "»" "‹" "›"; /* Set two levels of quotation marks */
/* Global values */
The open-quote and close-quote values of the content property produce no quotation marks.
One or more pairs of <string> values for open-quote and close-quote. The first pair represents the outer level of quotation, the second pair is for the first nested level, next pair for third level and so on.