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10//# sourceMappingURL=bootstrap.bundle.min.js.map
11/**
12 * Copyright 2016 Google Inc. All Rights Reserved.
13 *
14 * Licensed under the W3C SOFTWARE AND DOCUMENT NOTICE AND LICENSE.
15 *
16 *  https://www.w3.org/Consortium/Legal/2015/copyright-software-and-document
17 *
18 */
19(function() {
20'use strict';
21
22// Exit early if we're not running in a browser.
23if (typeof window !== 'object') {
24  return;
25}
26
27// Exit early if all IntersectionObserver and IntersectionObserverEntry
28// features are natively supported.
29if ('IntersectionObserver' in window &&
30    'IntersectionObserverEntry' in window &&
31    'intersectionRatio' in window.IntersectionObserverEntry.prototype) {
32
33  // Minimal polyfill for Edge 15's lack of `isIntersecting`
34  // See: https://github.com/w3c/IntersectionObserver/issues/211
35  if (!('isIntersecting' in window.IntersectionObserverEntry.prototype)) {
36    Object.defineProperty(window.IntersectionObserverEntry.prototype,
37      'isIntersecting', {
38      get: function () {
39        return this.intersectionRatio > 0;
40      }
41    });
42  }
43  return;
44}
45
46
47/**
48 * A local reference to the document.
49 */
50var document = window.document;
51
52
53/**
54 * An IntersectionObserver registry. This registry exists to hold a strong
55 * reference to IntersectionObserver instances currently observing a target
56 * element. Without this registry, instances without another reference may be
57 * garbage collected.
58 */
59var registry = [];
60
61/**
62 * The signal updater for cross-origin intersection. When not null, it means
63 * that the polyfill is configured to work in a cross-origin mode.
64 * @type {function(DOMRect|ClientRect, DOMRect|ClientRect)}
65 */
66var crossOriginUpdater = null;
67
68/**
69 * The current cross-origin intersection. Only used in the cross-origin mode.
70 * @type {DOMRect|ClientRect}
71 */
72var crossOriginRect = null;
73
74
75/**
76 * Creates the global IntersectionObserverEntry constructor.
77 * https://w3c.github.io/IntersectionObserver/#intersection-observer-entry
78 * @param {Object} entry A dictionary of instance properties.
79 * @constructor
80 */
81function IntersectionObserverEntry(entry) {
82  this.time = entry.time;
83  this.target = entry.target;
84  this.rootBounds = ensureDOMRect(entry.rootBounds);
85  this.boundingClientRect = ensureDOMRect(entry.boundingClientRect);
86  this.intersectionRect = ensureDOMRect(entry.intersectionRect || getEmptyRect());
87  this.isIntersecting = !!entry.intersectionRect;
88
89  // Calculates the intersection ratio.
90  var targetRect = this.boundingClientRect;
91  var targetArea = targetRect.width * targetRect.height;
92  var intersectionRect = this.intersectionRect;
93  var intersectionArea = intersectionRect.width * intersectionRect.height;
94
95  // Sets intersection ratio.
96  if (targetArea) {
97    // Round the intersection ratio to avoid floating point math issues:
98    // https://github.com/w3c/IntersectionObserver/issues/324
99    this.intersectionRatio = Number((intersectionArea / targetArea).toFixed(4));
100  } else {
101    // If area is zero and is intersecting, sets to 1, otherwise to 0
102    this.intersectionRatio = this.isIntersecting ? 1 : 0;
103  }
104}
105
106
107/**
108 * Creates the global IntersectionObserver constructor.
109 * https://w3c.github.io/IntersectionObserver/#intersection-observer-interface
110 * @param {Function} callback The function to be invoked after intersection
111 *     changes have queued. The function is not invoked if the queue has
112 *     been emptied by calling the `takeRecords` method.
113 * @param {Object=} opt_options Optional configuration options.
114 * @constructor
115 */
116function IntersectionObserver(callback, opt_options) {
117
118  var options = opt_options || {};
119
120  if (typeof callback != 'function') {
121    throw new Error('callback must be a function');
122  }
123
124  if (options.root && options.root.nodeType != 1) {
125    throw new Error('root must be an

125 Element');
126  }
127
128  // Binds and throttles `this._checkForIntersections`.
129  this._checkForIntersections = throttle(
130      this._checkForIntersections.bind(this), this.THROTTLE_TIMEOUT);
131
132  // Private properties.
133  this._callback = callback;
134  this._observationTargets = [];
135  this._queuedEntries = [];
136  this._rootMarginValues = this._parseRootMargin(options.rootMargin);
137
138  // Public properties.
139  this.thresholds = this._initThresholds(options.threshold);
140  this.root = options.root || null;
141  this.rootMargin = this._rootMarginValues.map(function(margin) {
142    return margin.value + margin.unit;
143  }).join(' ');
144
145  /** @private @const {!Array<!Document>} */
146  this._monitoringDocuments = [];
147  /** @private @const {!Array<function()>} */
148  this._monitoringUnsubscribes = [];
149}
150
151
152/**
153 * The minimum interval within which the document will be checked for
154 * intersection changes.
155 */
156IntersectionObserver.prototype.THROTTLE_TIMEOUT = 100;
157
158
159/**
160 * The frequency in which the polyfill polls for intersection changes.
161 * this can be updated on a per instance basis and must be set prior to
162 * calling `observe` on the first target.
163 */
164IntersectionObserver.prototype.POLL_INTERVAL = null;
165
166/**
167 * Use a mutation observer on the root element
168 * to detect intersection changes.
169 */
170IntersectionObserver.prototype.USE_MUTATION_OBSERVER = true;
171
172
173/**
174 * Sets up the polyfill in the cross-origin mode. The result is the
175 * updater function that accepts two arguments: `boundingClientRect` and
176 * `intersectionRect` - just as these fields would be available to the
177 * parent via `IntersectionObserverEntry`. This function should be called
178 * each time the iframe receives intersection information from the parent
179 * window, e.g. via messaging.
180 * @return {function(DOMRect|ClientRect, DOMRect|ClientRect)}
181 */
182IntersectionObserver._setupCrossOriginUpdater = function() {
183  if (!crossOriginUpdater) {
184    /**
185     * @param {DOMRect|ClientRect} boundingClientRect
186     * @param {DOMRect|ClientRect} intersectionRect
187     */
188    crossOriginUpdater = function(boundingClientRect, intersectionRect) {
189      if (!boundingClientRect || !intersectionRect) {
190        crossOriginRect = getEmptyRect();
191      } else {
192        crossOriginRect = convertFromParentRect(boundingClientRect, intersectionRect);
193      }
194      registry.forEach(function(observer) {
195        observer._checkForIntersections();
196      });
197    };
198  }
199  return crossOriginUpdater;
200};
201
202
203/**
204 * Resets the cross-origin mode.
205 */
206IntersectionObserver._resetCrossOriginUpdater = function() {
207  crossOriginUpdater = null;
208  crossOriginRect = null;
209};
210
211
212/**
213 * Starts observing a target element for intersection changes based on
214 * the thresholds values.
215 * @param {Element} target The DOM element to observe.
216 */
217IntersectionObserver.prototype.observe = function(target) {
218  var isTargetAlreadyObserved = this._observationTargets.some(function(item) {
219    return item.element == target;
220  });
221
222  if (isTargetAlreadyObserved) {
223    return;
224  }
225
226  if (!(target && target.nodeType == 1)) {
227    throw new Error('target must be an Element');
228  }
229
230  this._registerInstance();
231  this._observationTargets.push({element: target, entry: null});
232  this._monitorIntersections(target.ownerDocument);
233  this._checkForIntersections();
234};
235
236
237/**
238 * Stops observing a target element for intersection changes.
239 * @param {Element} target The DOM element to observe.
240 */
241IntersectionObserver.prototype.unobserve = function(target) {
242  this._observationTargets =
243      this._observationTargets.filter(function(item) {
244        return item.element != target;
245      });
246  this._unmonitorIntersections(target.ownerDocument);
247  if (this._observationTargets.length == 0) {
248    this._unregisterInstance();
249  }
250};
251
252
253/**
254 * Stops observing all target elements for intersection changes.
255 */
256IntersectionObserver.prototype.disconnect = function() {
257  this._observationTargets = [];
258  this._unmonitorAllIntersections();
259  this._unregisterInstance();
260};
261
262
263/**
264 * Returns any queue entries that have not yet been reported to the
265 * callback and clears the queue. This can be used in conjunction with the
266 * callback to obtain the absolute most up-to-date intersection information.
267 * @return {Array} The currently queued entries.
268 */
269IntersectionObserver.prototype.takeRecords = function() {
270  var records = this._queuedEntries.slice();
271  this._queuedEntries = [];
272  return records;
273};
274
275
276/**
277 * Accepts the threshold value from the user configuration object and
278 * returns a sorted array of unique threshold values. If a value is not
279 * between 0 and 1 and error is thrown.
280 * @private
281 * @param {Array|number=} opt_threshold An optional threshold value or
282 *     a list of threshold values, defaulting to [0].
283 * @return {Array} A sorted list of unique and valid threshold values.
284 */
285IntersectionObserver.prototype._initThresholds = function(opt_threshold) {
286  var threshold = opt_threshold || [0];
287  if (!Array.isArray(threshold)) threshold = [threshold];
288
289  return threshold.sort().filter(function(t, i, a) {
290    if (typeof t != 'number' || isNaN(t) || t < 0 || t > 1) {
291      throw new Error('threshold must be a number between 0 and 1 inclusively');
292    }
293    return t !== a[i - 1];
294  });
295};
296
297
298/**
299 * Accepts the rootMargin value from the user configuration object
300 * and returns an array of the four margin values as an object containing
301 * the value and unit properties. If any of the values are not properly
302 * formatted or use a unit other than px or %, and error is thrown.
303 * @private
304 * @param {string=} opt_rootMargin An optional rootMargin value,
305 *     defaulting to '0px'.
306 * @return {Array<Object>} An array of margin objects with the keys
307 *     value and unit.
308 */
309IntersectionObserver.prototype._parseRootMargin = function(opt_rootMargin) {
310  var marginString = opt_rootMargin || '0px';
311  var margins = marginString.split(/\s+/).map(function(margin) {
312    var parts = /^(-?\d*\.?\d+)(px|%)$/.exec(margin);
313    if (!parts) {
314      throw new Error('rootMargin must be specified in pixels or percent');
315    }
316    return {value: parseFloat(parts[1]), unit: parts[2]};
317  });
318
319  // Handles shorthand.
320  margins[1] = margins[1] || margins[0];
321  margins[2] = margins[2] || margins[0];
322  margins[3] = margins[3] || margins[1];
323
324  return margins;
325};
326
327
328/**
329 * Starts polling for intersection changes if the polling is not already
330 * happening, and if the page's visibility state is visible.
331 * @param {!Document} doc
332 * @private
333 */
334IntersectionObserver.prototype._monitorIntersections = function(doc) {
335  var win = doc.defaultView;
336  if (!win) {
337    // Already destroyed.
338    return;
339  }
340  if (this._monitoringDocuments.indexOf(doc) != -1) {
341    // Already monitoring.
342    return;
343  }
344
345  // Private state for monitoring.
346  var callback = this._checkForIntersections;
347  var monitoringInterval = null;
348  var domObserver = null;
349
350  // If a poll interval is set, use polling instead of listening to
351  // resize and scroll events or DOM mutations.
352  if (this.POLL_INTERVAL) {
353    monitoringInterval = win.setInterval(callback, this.POLL_INTERVAL);
354  } else {
355    addEvent(win, 'resize', callback, true);
356    addEvent(doc, 'scroll', callback, true);
357    if (this.USE_MUTATION_OBSERVER && 'MutationObserver' in win) {
358      domObserver = new win.MutationObserver(callback);
359      domObserver.observe(doc, {
360        attributes: true,
361        childList: true,
362        characterData: true,
363        subtree: true
364      });
365    }
366  }
367
368  this._monitoringDocuments.push(doc);
369  this._monitoringUnsubscribes.push(function() {
370    // Get the window object again. When a friendly iframe is destroyed, it
371    // will be null.
372    var win = doc.defaultView;
373
374    if (win) {
375      if (monitoringInterval) {
376        win.clearInterval(monitoringInterval);
377      }
378      removeEvent(win, 'resize', callback, true);
379    }
380
381    removeEvent(doc, 'scroll', callback, true);
382    if (domObserver) {
383      domObserver.disconnect();
384    }
385  });
386
387  // Also monitor the parent.
388  

388if (doc != (this.root && this.root.ownerDocument || document)) {
389    var frame = getFrameElement(doc);
390    if (frame) {
391      this._monitorIntersections(frame.ownerDocument);
392    }
393  }
394};
395
396
397/**
398 * Stops polling for intersection changes.
399 * @param {!Document} doc
400 * @private
401 */
402IntersectionObserver.prototype._unmonitorIntersections = function(doc) {
403  var index = this._monitoringDocuments.indexOf(doc);
404  if (index == -1) {
405    return;
406  }
407
408  var rootDoc = (this.root && this.root.ownerDocument || document);
409
410  // Check if any dependent targets are still remaining.
411  var hasDependentTargets =
412      this._observationTargets.some(function(item) {
413        var itemDoc = item.element.ownerDocument;
414        // Target is in this context.
415        if (itemDoc == doc) {
416          return true;
417        }
418        // Target is nested in this context.
419        while (itemDoc && itemDoc != rootDoc) {
420          var frame = getFrameElement(itemDoc);
421          itemDoc = frame && frame.ownerDocument;
422          if (itemDoc == doc) {
423            return true;
424          }
425        }
426        return false;
427      });
428  if (hasDependentTargets) {
429    return;
430  }
431
432  // Unsubscribe.
433  var unsubscribe = this._monitoringUnsubscribes[index];
434  this._monitoringDocuments.splice(index, 1);
435  this._monitoringUnsubscribes.splice(index, 1);
436  unsubscribe();
437
438  // Also unmonitor the parent.
439  if (doc != rootDoc) {
440    var frame = getFrameElement(doc);
441    if (frame) {
442      this._unmonitorIntersections(frame.ownerDocument);
443    }
444  }
445};
446
447
448/**
449 * Stops polling for intersection changes.
450 * @param {!Document} doc
451 * @private
452 */
453IntersectionObserver.prototype._unmonitorAllIntersections = function() {
454  var unsubscribes = this._monitoringUnsubscribes.slice(0);
455  this._monitoringDocuments.length = 0;
456  this._monitoringUnsubscribes.length = 0;
457  for (var i = 0; i < unsubscribes.length; i++) {
458    unsubscribes[i]();
459  }
460};
461
462
463/**
464 * Scans each observation target for intersection changes and adds them
465 * to the internal entries queue. If new entries are found, it
466 * schedules the callback to be invoked.
467 * @private
468 */
469IntersectionObserver.prototype._checkForIntersections = function() {
470  if (!this.root && crossOriginUpdater && !crossOriginRect) {
471    // Cross origin monitoring, but no initial data available yet.
472    return;
473  }
474
475  var rootIsInDom = this._rootIsInDom();
476  var rootRect = rootIsInDom ? this._getRootRect() : getEmptyRect();
477
478  this._observationTargets.forEach(function(item) {
479    var target = item.element;
480    var targetRect = getBoundingClientRect(target);
481    var rootContainsTarget = this._rootContainsTarget(target);
482    var oldEntry = item.entry;
483    var intersectionRect = rootIsInDom && rootContainsTarget &&
484        this._computeTargetAndRootIntersection(target, targetRect, rootRect);
485
486    var newEntry = item.entry = new IntersectionObserverEntry({
487      time: now(),
488      target: target,
489      boundingClientRect: targetRect,
490      rootBounds: crossOriginUpdater && !this.root ? null : rootRect,
491      intersectionRect: intersectionRect
492    });
493
494    if (!oldEntry) {
495      this._queuedEntries.push(newEntry);
496    } else if (rootIsInDom && rootContainsTarget) {
497      // If the new entry intersection ratio has crossed any of the
498      // thresholds, add a new entry.
499      if (this._hasCrossedThreshold(oldEntry, newEntry)) {
500        this._queuedEntries.push(newEntry);
501      }
502    } else {
503      // If the root is not in the DOM or target is not contained within
504      // root but the previous entry for this target had an intersection,
505      // add a new record indicating removal.
506      if (oldEntry && oldEntry.isIntersecting) {
507        this._queuedEntries.push(newEntry);
508      }
509    }
510  }, this);
511
512  if (this._queuedEntries.length) {
513    this._callback(this.takeRecords(), this);
514  }
515};
516
517
518/**
519 * Accepts a target and root rect computes the intersection between then
520 * following the algorithm in the spec.
521 * TODO(philipwalton): at this time clip-path is not considered.
522 * https://w3c.github.io/IntersectionObserver/#calculate-intersection-rect-algo
523 * @param {Element} target The target DOM element
524 * @param {Object} targetRect The bounding rect of the target.
525 * @param {Object} rootRect The bounding rect of the root after being
526 *     expanded by the rootMargin value.
527 * @return {?Object} The final intersection rect object or undefined if no
528 *     intersection is found.
529 * @private
530 */
531IntersectionObserver.prototype._computeTargetAndRootIntersection =
532    function(target, targetRect, rootRect) {
533  // If the element isn't displayed, an intersection can't happen.
534  if (window.getComputedStyle(target).display == 'none') return;
535
536  var intersectionRect = targetRect;
537  var parent = getParentNode(target);
538  var atRoot = false;
539
540  while (!atRoot && parent) {
541    var parentRect = null;
542    var parentComputedStyle = parent.nodeType == 1 ?
543        window.getComputedStyle(parent) : {};
544
545    // If the parent isn't displayed, an intersection can't happen.
546    if (parentComputedStyle.display == 'none') return null;
547
548    if (parent == this.root || parent.nodeType == /* DOCUMENT */ 9) {
549      atRoot = true;
550      if (parent == this.root || parent == document) {
551        if (crossOriginUpdater && !this.root) {
552          if (!crossOriginRect ||
553              crossOriginRect.width == 0 && crossOriginRect.height == 0) {
554            // A 0-size cross-origin intersection means no-intersection.
555            parent = null;
556            parentRect = null;
557            intersectionRect = null;
558          } else {
559            parentRect = crossOriginRect;
560          }
561        } else {
562          parentRect = rootRect;
563        }
564      } else {
565        // Check if there's a frame that can be navigated to.
566        var frame = getParentNode(parent);
567        var frameRect = frame && getBoundingClientRect(frame);
568        var frameIntersect =
569            frame &&
570            this._computeTargetAndRootIntersection(frame, frameRect, rootRect);
571        if (frameRect && frameIntersect) {
572          parent = frame;
573          parentRect = convertFromParentRect(frameRect, frameIntersect);
574        } else {
575          parent = null;
576          intersectionRect = null;
577        }
578      }
579    } else {
580      // If the element has a non-visible overflow, and it's not the <body>
581      // or <html> element, update the intersection rect.
582      // Note: <body> and <html> cannot be clipped to a rect that's not also
583      // the document rect, so no need to compute a new intersection.
584      var doc = parent.ownerDocument;
585      if (parent != doc.body &&
586          parent != doc.documentElement &&
587          parentComputedStyle.overflow != 'visible') {
588        parentRect = getBoundingClientRect(parent);
589      }
590    }
591
592    // If either of the above conditionals set a new parentRect,
593    // calculate new intersection data.
594    if (parentRect) {
595      intersectionRect = computeRectIntersection(parentRect, intersectionRect);
596    }
597    if (!intersectionRect) break;
598    parent = parent && getParentNode(parent);
599  }
600  return intersectionRect;
601};
602
603
604/**
605 * Returns the root rect after being expanded by the rootMargin value.
606 * @return {ClientRect} The expanded root rect.
607 * @private
608 */
609IntersectionObserver.prototype._getRootRect = function() {
610  var rootRect;
611  if (this.root) {
612    rootRect = getBoundingClientRect(this.root);
613  } else {
614    // Use <html>/<body> instead of window since scroll bars affect size.
615    var html = document.documentElement;
616    var body = document.body;
617    rootRect = {
618      top: 0,
619      left: 0,
620      right: html.clientWidth || body.clientWidth,
621      width: html.clientWidth || body.clientWidth,
622      bottom: html.clientHeight || body.clientHeight,
623      height: html.clientHeight || body.clientHeight
624    };
625  }
626  return this._expandRectByRootMargin(rootRect);
627};
628
629
630/**
631 * Accepts a rect and expands it by the rootMargin value.
632 * @param {DOMRect|ClientRect} rect The rect object to expand.
633 * @return {ClientRect} The expanded rect.
634 * @private
635 */
636IntersectionObserver.prototype._expandRectByRootMargin = function(rect) {
637  var margins = this._rootMarginValues.map(function(margin, i) {
638    return margin.unit == 'px' ? margin.value :
639        margin.value * (i % 2 ? rect.width : rect.height) / 100;
640  });
641  var newRect = {
642    top: rect.top - margins[0],
643    right: rect.right + margins[1],
644    bottom: rect.bottom + margins[2],
645    left: rect.left - margins[3]
646  };
647  newRect.width = newRect.right - newRect.left;
648  newRect.height = newRect.bottom - newRect.top;
649
650  return newRect;
651};
652
653
654/**
655 * Accepts an old and new entry and returns true if at least one of the
656 * threshold values has been crossed.
657 * @param {?IntersectionObserverEntry} oldEntry The previous entry for a
658 *    particular target element or null if no previous entry exists.
659 * @param {IntersectionObserverEntry} newEntry The current entry for a
660 *    particular target element.
661 * @return {boolean} Returns true if a any threshold has been crossed.
662 * @private
663 */
664IntersectionObserver.prototype._hasCrossedThreshold =
665    function(oldEntry, newEntry) {
666
667  // To make comparing easier, an entry that has a ratio of 0
668  // but does not actually intersect is given a value of -1
669  var oldRatio = oldEntry && oldEntry.isIntersecting ?
670      oldEntry.intersectionRatio || 0 : -1;
671  var newRatio = newEntry.isIntersecting ?
672      newEntry.intersectionRatio || 0 : -1;
673
674  // Ignore unchanged ratios
675  if (oldRatio === newRatio) return;
676
677  for (var i = 0; i < this.thresholds.length; i++) {
678    var threshold = this.thresholds[i];
679
680    // Return true if an entry matches a threshold or if the new ratio
681    // and the old ratio are on the opposite sides of a threshold.
682    if (threshold == oldRatio || threshold == newRatio ||
683        threshold < oldRatio !== threshold < newRatio) {
684      return true;
685    }
686  }
687};
688
689
690/**
691 * Returns whether or not the root element is an element and is in the DOM.
692 * @return {boolean} True if the root element is an element and is in the DOM.
693 * @private
694 */
695IntersectionObserver.prototype._rootIsInDom = function() {
696  return !this.root || containsDeep(document, this.root);
697};
698
699
700/**
701 * Returns whether or not the target element is a child of root.
702 * @param {Element} target The target element to check.
703 * @return {boolean} True if the target element is a child of root.
704 * @private
705 */
706IntersectionObserver.prototype._rootContainsTarget = function(target) {
707  return containsDeep(this.root || document, target) &&
708    (!this.root || this.root.ownerDocument == target.ownerDocument);
709};
710
711
712/**
713 * Adds the instance to the global IntersectionObserver registry if it isn't
714 * already present.
715 * @private
716 */
717IntersectionObserver.prototype._registerInstance = function() {
718  if (registry.indexOf(this) < 0) {
719    registry.push(this);
720  }
721};
722
723
724/**
725 * Removes the instance from the global IntersectionObserver registry.
726 * @private
727 */
728IntersectionObserver.prototype._unregisterInstance = function() {
729  var index = registry.indexOf(this);
730  if (index != -1) registry.splice(index, 1);
731};
732
733
734/**
735 * Returns the result of the performance.now() method or null in browsers
736 * that don't support the API.
737 * @return {number} The elapsed time since the page was requested.
738 */
739function now() {
740  return window.performance && performance.now && performance.now();
741}
742
743
744/**
745 * Throttles a function and delays its execution, so it's only called at most
746 * once within a given time period.
747 * @param {Function} fn The function to throttle.
748 * @param {number} timeout The amount of time that must pass before the
749 *     function can be called again.
750 * @return {Function} The throttled function.
751 */
752function throttle(fn, timeout) {
753  var timer = null;
754  return function () {
755    if (!timer) {
756      timer = setTimeout(function() {
757        fn();
758        timer = null;
759      }, timeout);
760    }
761  };
762}
763
764
765/**
766 * Adds an event handler to a DOM node ensuring cross-browser compatibility.
767 * @param {Node} node The DOM node to add the event handler to.
768 * @param {string} event The event name.
769 * @param {Function} fn The event handler to add.
770 * @param {boolean} opt_useCapture Optionally adds the even to the capture
771 *     phase. Note: this only works in modern browsers.
772 */
773function addEvent(node, event, fn, opt_useCapture) {
774  if (typeof node.addEventListener == 'function') {
775    node.addEventListener(event, fn, opt_useCapture || false);
776  }
777  else if (typeof node.attachEvent == 'function') {
778    node.attachEvent('on' + event, fn);
779  }
780}
781
782
783/**
784 * Removes a previously added event handler from a DOM node.
785 * @param {Node} node The DOM node to remove the event handler from.
786 * @param {string} event The event name.
787 * @param {Function} fn The event handler to remove.
788 * @param {boolean} opt_useCapture If the event handler was added with this
789 *     flag set to true, it should be set to true here in order to remove it.
790 */
791function removeEvent(node, event, fn, opt_useCapture) {
792  if (typeof node.removeEventListener == 'function') {
793    node.removeEventListener(event, fn, opt_useCapture || false);
794  }
795  else if (typeof node.detatchEvent == 'function') {
796    node.detatchEvent('on' + event, fn);
797  }
798}
799
800
801/**
802 * Returns the intersection between two rect objects.
803 * @param {Object} rect1 The first rect.
804 * @param {Object} rect2 The second rect.
805 * @return {?Object|?ClientRect} The intersection rect or undefined if no
806 *     intersection is found.
807 */
808function computeRectIntersection(rect1, rect2) {
809  var top = Math.max(rect1.top, rect2.top);
810  var bottom = Math.min(rect1.bottom, rect2.bottom);
811  var left = Math.max(rect1.left, rect2.left);
812  var right = Math.min(rect1.right, rect2.right);
813  var width = right - left;
814  var height = bottom - top;
815
816  return (width >= 0 && height >= 0) && {
817    top: top,
818    bottom: bottom,
819    left: left,
820    right: right,
821    width: width,
822    height: height
823  } || null;
824}
825
826
827/**
828 * Shims the native getBoundingClientRect for compatibility with older IE.
829 * @param {Element} el The element whose bounding rect to get.
830 * @return {DOMRect|ClientRect} The (possibly shimmed) rect of the element.
831 */
832function getBoundingClientRect(el) {
833  var rect;
834
835  try {
836    rect = el.getBoundingClientRect();
837  } catch (err) {
838    // Ignore Windows 7 IE11 "Unspecified error"