docs: function find(n, sel){
      if(typeof n === 'string'){
        sel = n;
        n = false;
      }
      if(typeof document.querySelectorAll !== 'undefined'){
        return (n||document).querySelectorAll( sel );
      }else{
        error('You can test PURE standalone with: iPhone, FF3.5+, Safari4+ and IE8+\n\nTo run PURE on your browser, you need a JS library/framework with a CSS selector engine');
      }
    }