diff --git a/js/src/alert.js b/js/src/alert.js
index 1bdd9706a4..9332aa891d 100644
--- a/js/src/alert.js
+++ b/js/src/alert.js
@@ -114,8 +114,11 @@ class Alert {
   }
 
   _destroyElement(element) {
+    if (element.parentNode) {
+      element.parentNode.removeChild(element)
+    }
+
     EventHandler.trigger(element, Event.CLOSED)
-    element.parentNode.removeChild(element)
   }
 
   // Static
@@ -150,8 +153,8 @@ EventHandler.on(document, Event.CLICK_DATA_API, Selector.DISMISS, Alert._handleD
  * add .alert to jQuery only if jQuery is present
  */
 
-if (typeof window.$ !== 'undefined' || typeof window.jQuery !== 'undefined') {
-  const $                  = window.$ || window.jQuery
+const $ = Util.jQuery
+if (typeof $ !== 'undefined') {
   const JQUERY_NO_CONFLICT = $.fn[NAME]
   $.fn[NAME]               = Alert._jQueryInterface
   $.fn[NAME].Constructor   = Alert
diff --git a/js/src/button.js b/js/src/button.js
index acba736af4..0e3b8a9df5 100644
--- a/js/src/button.js
+++ b/js/src/button.js
@@ -9,6 +9,7 @@ import Data from './dom/data'
 import EventHandler from './dom/eventHandler'
 import Manipulator from './dom/manipulator'
 import SelectorEngine from './dom/selectorEngine'
+import Util from './util'
 
 /**
  * ------------------------------------------------------------------------
@@ -175,8 +176,8 @@ EventHandler.on(document, Event.BLUR_DATA_API, Selector.DATA_TOGGLE_CARROT, (eve
  * add .button to jQuery only if jQuery is present
  */
 
-if (typeof window.$ !== 'undefined' || typeof window.jQuery !== 'undefined') {
-  const $                   = window.$ || window.jQuery
+const $ = Util.jQuery
+if (typeof $ !== 'undefined') {
   const JQUERY_NO_CONFLICT  = $.fn[NAME]
   $.fn[NAME]                = Button._jQueryInterface
   $.fn[NAME].Constructor    = Button
diff --git a/js/src/carousel.js b/js/src/carousel.js
index e33788594d..fd6d5bf802 100644
--- a/js/src/carousel.js
+++ b/js/src/carousel.js
@@ -571,7 +571,7 @@ class Carousel {
       config.interval = false
     }
 
-    Carousel._jQueryInterface.call($(target), config)
+    Carousel._carouselInterface(target, config)
 
     if (slideIndex) {
       Data.getData(target, DATA_KEY).to(slideIndex)
@@ -605,8 +605,8 @@ EventHandler.on(window, Event.LOAD_DATA_API, () => {
  * add .carousel to jQuery only if jQuery is present
  */
 
-if (typeof window.$ !== 'undefined' || typeof window.jQuery !== 'undefined') {
-  const $                  = window.$ || window.jQuery
+const $ = Util.jQuery
+if (typeof $ !== 'undefined') {
   const JQUERY_NO_CONFLICT = $.fn[NAME]
   $.fn[NAME]               = Carousel._jQueryInterface
   $.fn[NAME].Constructor   = Carousel
diff --git a/js/src/collapse.js b/js/src/collapse.js
index 31200c33a8..7d6aa30ed8 100644
--- a/js/src/collapse.js
+++ b/js/src/collapse.js
@@ -141,12 +141,11 @@ class Collapse {
       }
     }
 
+    const container = SelectorEngine.findOne(this._selector)
     if (actives) {
-      const tempActiveData = actives.filter((elem) => {
-        const container = SelectorEngine.findOne(this._selector)
-        return !container.contains(elem)
-      })
+      const tempActiveData = actives.filter((elem) => container !== elem)
       activesData = tempActiveData[0] ? Data.getData(tempActiveData[0], DATA_KEY) : null
+
       if (activesData && activesData._isTransitioning) {
         return
       }
@@ -159,14 +158,14 @@ class Collapse {
 
     if (actives) {
       actives.forEach((elemActive) => {
-        const container = SelectorEngine.findOne(this._selector)
-        if (!container.contains(elemActive)) {
+        if (container !== elemActive) {
           Collapse._collapseInterface(elemActive, 'hide')
         }
+
+        if (!activesData) {
+          Data.setData(elemActive, DATA_KEY, null)
+        }
       })
-      if (!activesData) {
-        Data.setData(actives[0], DATA_KEY, null)
-      }
     }
 
     const dimension = this._getDimension()
diff --git a/js/src/dom/data.js b/js/src/dom/data.js
index 82ff5eae83..4cee65d2b8 100644
--- a/js/src/dom/data.js
+++ b/js/src/dom/data.js
@@ -23,10 +23,10 @@ const Data = (() => {
             key,
             id
           }
+          id++
         }
 
-        storeData[id] = data
-        id++
+        storeData[element.key.id] = data
       },
       get(element, key) {
         if (typeof element === 'undefined' || typeof element.key === 'undefined') {
diff --git a/js/src/dropdown.js b/js/src/dropdown.js
index 85d8738e0d..ddc783c0dd 100644
--- a/js/src/dropdown.js
+++ b/js/src/dropdown.js
@@ -460,7 +460,7 @@ class Dropdown {
     if (/input|textarea/i.test(event.target.tagName)
       ? event.which === SPACE_KEYCODE || event.which !== ESCAPE_KEYCODE &&
       (event.which !== ARROW_DOWN_KEYCODE && event.which !== ARROW_UP_KEYCODE ||
-        $(event.target).closest(Selector.MENU).length) : !REGEXP_KEYDOWN.test(event.which)) {
+        SelectorEngine.closest(event.target, Selector.MENU)) : !REGEXP_KEYDOWN.test(event.which)) {
       return
     }
 
diff --git a/js/src/index.js b/js/src/index.js
index 665b889c55..327de242b2 100644
--- a/js/src/index.js
+++ b/js/src/index.js
@@ -17,21 +17,6 @@ import Util from './util'
  * Licensed under MIT (https://github.com/twbs/bootstrap/blob/master/LICENSE)
  * --------------------------------------------------------------------------
  */
-(() => {
-  // only check jQuery version if jQuery is available
-  if (typeof window.$ !== 'undefined' || typeof window.jQuery !== 'undefined') {
-    const version = window.$.fn.jquery.split(' ')[0].split('.')
-    const minMajor = 1
-    const ltMajor  = 2
-    const minMinor = 9
-    const minPatch = 1
-    const maxMajor = 4
-
-    if (version[0] < ltMajor && version[1] < minMinor || version[0] === minMajor && version[1] === minMinor && version[2] < minPatch || version[0] >= maxMajor) {
-      throw new Error('Bootstrap\'s JavaScript requires at least jQuery v1.9.1 but less than v4.0.0')
-    }
-  }
-})()
 
 export {
   Util,
diff --git a/js/src/modal.js b/js/src/modal.js
index 898d1c73d7..6da3d25aa8 100644
--- a/js/src/modal.js
+++ b/js/src/modal.js
@@ -232,7 +232,7 @@ class Modal {
   }
 
   _showElement(relatedTarget) {
-    const transition = $(this._element).hasClass(ClassName.FADE)
+    const transition = this._element.classList.contains(ClassName.FADE)
 
     if (!this._element.parentNode ||
         this._element.parentNode.nodeType !== Node.ELEMENT_NODE) {
@@ -295,14 +295,14 @@ class Modal {
 
   _setEscapeEvent() {
     if (this._isShown && this._config.keyboard) {
-      $(this._element).on(Event.KEYDOWN_DISMISS, (event) => {
+      EventHandler.on(this._element, Event.KEYDOWN_DISMISS, (event) => {
         if (event.which === ESCAPE_KEYCODE) {
           event.preventDefault()
           this.hide()
         }
       })
     } else if (!this._isShown) {
-      $(this._element).off(Event.KEYDOWN_DISMISS)
+      EventHandler.off(this._element, Event.KEYDOWN_DISMISS)
     }
   }
 
diff --git a/js/src/util.js b/js/src/util.js
index 667f46076f..78f5fe3fbe 100644
--- a/js/src/util.js
+++ b/js/src/util.js
@@ -69,8 +69,8 @@ const Util = {
     }
 
     // Get transition-duration of the element
-    let transitionDuration = element.style.transitionDuration
-    let transitionDelay = element.style.transitionDelay
+    let transitionDuration = window.getComputedStyle(element).transitionDuration
+    let transitionDelay = window.getComputedStyle(element).transitionDelay
 
     const floatTransitionDuration = parseFloat(transitionDuration)
     const floatTransitionDelay = parseFloat(transitionDelay)
@@ -92,7 +92,7 @@ const Util = {
   },
 
   triggerTransitionEnd(element) {
-    EventHandler.trigger(element, Util.TRANSITION_END)
+    element.dispatchEvent(new Event(Util.TRANSITION_END))
   },
 
   // TODO: Remove in v5
diff --git a/js/tests/unit/alert.js b/js/tests/unit/alert.js
index 588908d66e..3fe796e28b 100644
--- a/js/tests/unit/alert.js
+++ b/js/tests/unit/alert.js
@@ -91,7 +91,7 @@ $(function () {
     var done = assert.async()
     var $el = $('<div/>')
     var $alert = $el.bootstrapAlert()
-    var alertInstance = $alert.data('bs.alert')
+    var alertInstance = Data.getData($alert[0], 'bs.alert')
 
     $alert.one('closed.bs.alert', function () {
       assert.ok('alert closed')
@@ -107,11 +107,11 @@ $(function () {
     var $el = $('<div/>')
     var $alert = $el.bootstrapAlert()
 
-    assert.ok(typeof $alert.data('bs.alert') !== 'undefined')
+    assert.ok(typeof Data.getData($alert[0], 'bs.alert') !== 'undefined')
 
-    $alert.data('bs.alert').dispose()
+    Data.getData($alert[0], 'bs.alert').dispose()
 
-    assert.ok(typeof $alert.data('bs.button') === 'undefined')
+    assert.ok(Data.getData($alert[0], 'bs.alert') === null)
   })
 
   QUnit.test('should return alert version', function (assert) {
diff --git a/js/tests/unit/button.js b/js/tests/unit/button.js
index c162e3a9fd..0fa19d1548 100644
--- a/js/tests/unit/button.js
+++ b/js/tests/unit/button.js
@@ -208,11 +208,11 @@ $(function () {
     var $el = $('<div/>')
     var $button = $el.bootstrapButton()
 
-    assert.ok(typeof $button.data('bs.button') !== 'undefined')
+    assert.ok(typeof Data.getData($button[0], 'bs.button') !== 'undefined')
 
-    $button.data('bs.button').dispose()
+    Data.getData($button[0], 'bs.button').dispose()
 
-    assert.ok(typeof $button.data('bs.button') === 'undefined')
+    assert.ok(Data.getData($button[0], 'bs.button') === null)
   })
 
   QUnit.test('should return button version', function (assert) {
diff --git a/js/tests/unit/dropdown.js b/js/tests/unit/dropdown.js
index 2595ec27b2..c94b8a4410 100644
--- a/js/tests/unit/dropdown.js
+++ b/js/tests/unit/dropdown.js
@@ -1025,7 +1025,7 @@ $(function () {
       .find('[data-toggle="dropdown"]')
       .bootstrapDropdown()
 
-    var dropdown = $dropdown.data('bs.dropdown')
+    var dropdown = Data.getData($dropdown[0], 'bs.dropdown')
     dropdown.toggle()
     assert.ok(dropdown._popper)
 
@@ -1053,7 +1053,7 @@ $(function () {
       .find('[data-toggle="dropdown"]')
       .bootstrapDropdown()
 
-    var dropdown = $dropdown.data('bs.dropdown')
+    var dropdown = Data.getData($dropdown[0], 'bs.dropdown')
     var spyDetectNavbar = sinon.spy(dropdown, '_detectNavbar')
 
     dropdown.update()
@@ -1078,7 +1078,7 @@ $(function () {
       .find('[data-toggle="dropdown"]')
       .bootstrapDropdown()
 
-    var dropdown = $dropdown.data('bs.dropdown')
+    var dropdown = Data.getData($dropdown[0], 'bs.dropdown')
     dropdown.toggle()
 
     assert.ok(dropdown._popper)
@@ -1109,7 +1109,7 @@ $(function () {
       .find('[data-toggle="dropdown"]')
       .bootstrapDropdown()
 
-    var dropdown = $dropdown.data('bs.dropdown')
+    var dropdown = Data.getData($dropdown[0], 'bs.dropdown')
 
     assert.notOk(dropdown._popper)
     assert.ok(dropdown._menu !== null)
diff --git a/js/tests/unit/popover.js b/js/tests/unit/popover.js
index da436ad283..0dd9c98e39 100644
--- a/js/tests/unit/popover.js
+++ b/js/tests/unit/popover.js
@@ -279,14 +279,14 @@ $(function () {
       })
       .one('shown.bs.popover', function () {
         assert.notEqual($('.popover').length, 0, 'popover was inserted')
-        $div.find('a').trigger('click')
+        EventHandler.trigger($div.find('a')[0], 'click')
       })
       .one('hidden.bs.popover', function () {
         assert.strictEqual($('.popover').length, 0, 'popover was removed')
         done()
       })
 
-    $div.find('a').trigger('click')
+    EventHandler.trigger($div.find('a')[0], 'click')
   })
 
   QUnit.test('should detach popover content rather than removing it so that event handlers are left intact', function (assert) {
diff --git a/js/tests/unit/tooltip.js b/js/tests/unit/tooltip.js
index d2729fa64f..081cbb1099 100644
--- a/js/tests/unit/tooltip.js
+++ b/js/tests/unit/tooltip.js
@@ -1000,7 +1000,7 @@ $(function () {
       .appendTo('#qunit-fixture')
       .bootstrapTooltip()
 
-    var tooltip = $tooltip.data('bs.tooltip')
+    var tooltip = Data.getData($tooltip[0], 'bs.tooltip')
     tooltip.show()
     assert.ok(tooltip._popper)
 
@@ -1016,7 +1016,7 @@ $(function () {
       .appendTo('#qunit-fixture')
       .bootstrapTooltip()
 
-    var tooltip = $tooltip.data('bs.tooltip')
+    var tooltip = Data.getData($tooltip[0], 'bs.tooltip')
     tooltip.update()
 
     assert.ok(tooltip._popper === null)