lib/zest.js
function(param) {
    return function(el) {
      var text = el.innerText || el.textContent || el.value || '';
      return !!~text.indexOf(param);
    };
  }
function(param) {
    return function(el) {
      var text = el.innerText || el.textContent || el.value || '';
      return !!~text.indexOf(param);
    };
  }
function ( param ) { return function ( el ) { var text = el . innerText || el . textContent || el . value || '' ; return ! ! ~ text . indexOf ( param ) ; } ; }
Non-standard, for compatibility purposes.
Non - standard for compatibility purposes .