Avoid deeply nested control flow statements.

Open

                  if ((data = cache[1]) === true || data === cachedruns) {
                    return data === true;
                  }

Avoid deeply nested control flow statements.

Open

                if (!contains(parts[_i])) {
                  el.className += " " +  parts[_i];
                }

Avoid deeply nested control flow statements.

Open

                if (!contains(parts[_i])) {
                  el.classList.add(parts[_i]);
                }

Avoid deeply nested control flow statements.

Open

                if (contains(parts[_i])) {
                  el.className.replace(parts[_i], "");
                }

Avoid deeply nested control flow statements.

Open

                  if (!(unmatched[i] || setMatched[i])) {
                    setMatched[i] = pop.call(results);
                  }

Avoid deeply nested control flow statements.

Open

                  if (contains(parts[_i])) {
                    el.className.replace(parts[_i], "");
                  } else {
                    el.className += " " +  parts[_i];
                  }

Avoid deeply nested control flow statements.

Open

                  if (contains(parts[_i])) {
                    el.className.replace(parts[_i], "");
                  } else {
                    el.className += " " +  parts[_i];
                  }

Function indexOf has a Cognitive Complexity of 8 (exceeds 5 allowed). Consider refactoring.

Open

  var indexOf = function indexOf(arr, sought /*, fromIndex */ ) {
    var self = splitString && arr.toString() === "[object String]" ?
            this.split("") :
            toObject(this)
      , length = self.length >>> 0;

• Read up
  Read up

Function setMatcher has 6 arguments (exceeds 4 allowed). Consider refactoring.

Open

    function setMatcher(preFilter, selector, matcher, postFilter, postFinder, postSelector) {

Avoid deeply nested control flow statements.

Open

                if (contains(parts[_i])) {
                  el.className.replace(parts[_i], "");
                }

Avoid deeply nested control flow statements.

Open

              if (elem && elem.parentNode) {
                // Handle the case where IE, Opera, and Webkit return items
                // by name instead of ID
                if (elem.id === m) {
                  results.push(elem);

Avoid deeply nested control flow statements.

Open

              if (context.ownerDocument && (elem = context.ownerDocument.getElementById(m)) &&
                contains(context, elem) && elem.id === m) {
                results.push(elem);
                return results;
              }

Avoid deeply nested control flow statements.

Open

                if (v !== undefined) {
                  value[k] = v;
                } else {
                  delete value[k];
                }

Avoid deeply nested control flow statements.

Open

                  if (contains(parts[_i])) {
                    el.classList.remove(parts[_i]);
                  } else {
                    el.classList.add(parts[_i]);
                  }

Avoid deeply nested control flow statements.

Open

                  if (contains(parts[_i])) {
                    el.className.replace(parts[_i], "");
                  }

Avoid deeply nested control flow statements.

Open

              if (v) {
                partial.push(quote(k) + (gap ? ": " : ":") + v);
              }

Avoid deeply nested control flow statements.

Open

              if ((seed = find(
                token.matches[0].replace(runescape, funescape),
                rsibling.test(tokens[0].type) && context.parentNode || context
             ))) {

Avoid deeply nested control flow statements.

Open

                if (v !== undefined) {
                  value[k] = v;
                } else {
                  delete value[k];
                }

Avoid deeply nested control flow statements.

Open

              if ((seed = find(
                token.matches[0].replace(runescape, funescape),
                rsibling.test(tokens[0].type) && context.parentNode || context
             ))) {

Avoid deeply nested control flow statements.

Open

                  if (!contains(parts[_i])) {
                    el.classList.add(parts[_i]);
                  }