matches.js

      // If the input value looks something like `font-family: arial`, then
      // check to make sure the name and value match.  Otherwise, just compare
      // the input string directly against the name and value elements.
      let matches = false;
      if (propertyMatch && name && value) {
        matches = propertyName.contains(name) && propertyValue.contains(value);
      } else {
        matches = (name && propertyName.contains(name)) ||
                  (value && propertyValue.contains(value));
      }