PaulKinlan/criticalcss-bookmarklet-devtool-snippet.js

## criticalcss-bookmarklet-devtool-snippet.js
(function() {
  var CSSCriticalPath = function(w, d, opts) {
    var opt = opts || {};
    var css = {};
    var pushCSS = function(r) {
      if(!!css[r.selectorText] === false) css[r.selectorText] = {};
      var styles = r.style.cssText.split(/;(?![A-Za-z0-9])/);
      for(var i = 0; i < styles.length; i++) {
        if(!!styles[i] === false) continue;
        var pair = styles[i].split(": ");
        pair[0] = pair[0].trim();
        pair[1] = pair[1].trim();
        css[r.selectorText][pair[0]] = pair[1];
      }
    };

    var parseTree = function() {
      // Get a list of all the elements in the view.
      var height = w.innerHeight;
      var walker = d.createTreeWalker(d, NodeFilter.SHOW_ELEMENT, function(node) { return NodeFilter.FILTER_ACCEPT; }, true);

      while(walker.nextNode()) {
        var node = walker.currentNode;
        var rect = node.getBoundingClientRect();
        if(rect.top < height || opt.scanFullPage) {
          var rules = w.getMatchedCSSRules(node);
          if(!!rules) {
            for(var r = 0; r < rules.length; r++) {
              pushCSS(rules[r]);
            }
          }
        }
      }
    };

    this.generateCSS = function() {
      var finalCSS = "";
      for(var k in css) {
        finalCSS += k + " { ";
        for(var j in css[k]) {
          finalCSS += j + ": " + css[k][j] + "; ";
        }
        finalCSS += "}\n";
      }

      return finalCSS;
    };

    parseTree();
  };


  var cp = new CSSCriticalPath(window, document);
  var css = cp.generateCSS();

  console.log(css);
})();
	(function() {
	var CSSCriticalPath = function(w, d, opts) {
	var opt = opts \|\| {};
	var css = {};
	var pushCSS = function(r) {
	if(!!css[r.selectorText] === false) css[r.selectorText] = {};
	var styles = r.style.cssText.split(/;(?![A-Za-z0-9])/);
	for(var i = 0; i < styles.length; i++) {
	if(!!styles[i] === false) continue;
	var pair = styles[i].split(": ");
	pair[0] = pair[0].trim();
	pair[1] = pair[1].trim();
	css[r.selectorText][pair[0]] = pair[1];
	}
	};

	var parseTree = function() {
	// Get a list of all the elements in the view.
	var height = w.innerHeight;
	var walker = d.createTreeWalker(d, NodeFilter.SHOW_ELEMENT, function(node) { return NodeFilter.FILTER_ACCEPT; }, true);

	while(walker.nextNode()) {
	var node = walker.currentNode;
	var rect = node.getBoundingClientRect();
	if(rect.top < height \|\| opt.scanFullPage) {
	var rules = w.getMatchedCSSRules(node);
	if(!!rules) {
	for(var r = 0; r < rules.length; r++) {
	pushCSS(rules[r]);
	}
	}
	}
	}
	};

	this.generateCSS = function() {
	var finalCSS = "";
	for(var k in css) {
	finalCSS += k + " { ";
	for(var j in css[k]) {
	finalCSS += j + ": " + css[k][j] + "; ";
	}
	finalCSS += "}\n";
	}

	return finalCSS;
	};

	parseTree();
	};


	var cp = new CSSCriticalPath(window, document);
	var css = cp.generateCSS();

	console.log(css);
	})();