For the item that has a Gecko of 'font', what is the KHTML value?
CREATE TABLE "grammar_and_rules" (
  "trident" text,
  "gecko" text,
  "web_kit" text,
  "khtml" text,
  "presto" text,
  "prince_xml" text
);
SELECT "khtml" FROM "grammar_and_rules" WHERE "gecko"='font';