code: function checkHacks(declarations, rule, name, value) {
        var needsHack = name === 'content' && value.indexOf('viewport-units-buggyfill') > -1;
        if (!needsHack) {
          return;
        }
  
        var fakeRules = value.replace(quoteExpression, '');
        fakeRules.split(';').forEach(function(fakeRuleElement) {
          var fakeRule = fakeRuleElement.split(':');
          if (fakeRule.length !== 2) {
            return;
          }
  
          var name = fakeRule[0].trim();
          if (name === 'viewport-units-buggyfill') {
            return;
          }
  
          var value = fakeRule[1].trim();
          declarations.push([rule, name, value]);
          if (calcExpression.test(value)) {
            var webkitValue = value.replace(calcExpression, '-webkit-calc(');
            declarations.push([rule, name, webkitValue]);
          }
        });
      }
docs: iOS SAFARI, IE9, or Stock Android: abuse "content" if "viewport-units-buggyfill" specified