ytanruengsri

import React, {PureComponent} from 'react';
import PropTypes from 'prop-types';

/**
 * Based on Intersection Observer API
 **/
const BASE_CLASS = 'tracking_view';
const INTERSECTION_TYPES = {
  UPPER: 'UPPER',
  HALF: 'HALF',

ytanruengsri

(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(": ");