diff --git a/wp-includes/js/dist/vendor/wp-polyfill-dom-rect.js b/wp-includes/js/dist/vendor/wp-polyfill-dom-rect.js
new file mode 100644
index 0000000000..237c40619c
--- /dev/null
+++ b/wp-includes/js/dist/vendor/wp-polyfill-dom-rect.js
@@ -0,0 +1,99 @@
+(function (global) {
+	function number(v) {
+		return v === undefined ? 0 : Number(v);
+	}
+
+ 	function different(u, v) {
+		return u !== v && !(isNaN(u) && isNaN(v));
+	}
+
+ 	function DOMRect(xArg, yArg, wArg, hArg) {
+		var x, y, width, height, left, right, top, bottom;
+
+ 		x = number(xArg);
+		y = number(yArg);
+		width = number(wArg);
+		height = number(hArg);
+
+ 		Object.defineProperties(this, {
+			x: {
+				get: function () { return x; },
+				set: function (newX) {
+					if (different(x, newX)) {
+						x = newX;
+						left = right = undefined;
+					}
+				},
+				enumerable: true
+			},
+			y: {
+				get: function () { return y; },
+				set: function (newY) {
+					if (different(y, newY)) {
+						y = newY;
+						top = bottom = undefined;
+					}
+				},
+				enumerable: true
+			},
+			width: {
+				get: function () { return width; },
+				set: function (newWidth) {
+					if (different(width, newWidth)) {
+						width = newWidth;
+						left = right = undefined;
+					}
+				},
+				enumerable: true
+			},
+			height: {
+				get: function () { return height; },
+				set: function (newHeight) {
+					if (different(height, newHeight)) {
+						height = newHeight;
+						top = bottom = undefined;
+					}
+				},
+				enumerable: true
+			},
+			left: {
+				get: function () {
+					if (left === undefined) {
+						left = x + Math.min(0, width);
+					}
+					return left;
+				},
+				enumerable: true
+			},
+			right: {
+				get: function () {
+					if (right === undefined) {
+						right = x + Math.max(0, width);
+					}
+					return right;
+				},
+				enumerable: true
+			},
+			top: {
+				get: function () {
+					if (top === undefined) {
+						top = y + Math.min(0, height);
+					}
+					return top;
+				},
+				enumerable: true
+			},
+			bottom: {
+				get: function () {
+					if (bottom === undefined) {
+						bottom = y + Math.max(0, height);
+					}
+					return bottom;
+				},
+				enumerable: true
+			}
+		});
+	}
+
+ 	global.DOMRect = DOMRect;
+}(this));
\ No newline at end of file
diff --git a/wp-includes/js/dist/vendor/wp-polyfill-dom-rect.min.js b/wp-includes/js/dist/vendor/wp-polyfill-dom-rect.min.js
new file mode 100644
index 0000000000..9a8d73c039
--- /dev/null
+++ b/wp-includes/js/dist/vendor/wp-polyfill-dom-rect.min.js
@@ -0,0 +1 @@
+!function(e){function d(e){return void 0===e?0:Number(e)}function g(e,t){return e!==t&&!(isNaN(e)&&isNaN(t))}e.DOMRect=function(e,t,n,i){var u,r,o,c,f,a,m,b;u=d(e),r=d(t),o=d(n),c=d(i),Object.defineProperties(this,{x:{get:function(){return u},set:function(e){g(u,e)&&(u=e,f=a=void 0)},enumerable:!0},y:{get:function(){return r},set:function(e){g(r,e)&&(r=e,m=b=void 0)},enumerable:!0},width:{get:function(){return o},set:function(e){g(o,e)&&(o=e,f=a=void 0)},enumerable:!0},height:{get:function(){return c},set:function(e){g(c,e)&&(c=e,m=b=void 0)},enumerable:!0},left:{get:function(){return void 0===f&&(f=u+Math.min(0,o)),f},enumerable:!0},right:{get:function(){return void 0===a&&(a=u+Math.max(0,o)),a},enumerable:!0},top:{get:function(){return void 0===m&&(m=r+Math.min(0,c)),m},enumerable:!0},bottom:{get:function(){return void 0===b&&(b=r+Math.max(0,c)),b},enumerable:!0}})}}(this);
\ No newline at end of file
diff --git a/wp-includes/js/dist/vendor/wp-polyfill-url.js b/wp-includes/js/dist/vendor/wp-polyfill-url.js
new file mode 100644
index 0000000000..f102bc0032
--- /dev/null
+++ b/wp-includes/js/dist/vendor/wp-polyfill-url.js
@@ -0,0 +1,493 @@
+/* global Symbol */
+// URL Polyfill
+// Draft specification: https://url.spec.whatwg.org
+
+// Notes:
+// - Primarily useful for parsing URLs and modifying query parameters
+// - Should work in IE8+ and everything more modern, with es5.js polyfills
+
+(function (global) {
+  'use strict';
+
+  function isSequence(o) {
+    if (!o) return false;
+    if ('Symbol' in global && 'iterator' in global.Symbol &&
+        typeof o[Symbol.iterator] === 'function') return true;
+    if (Array.isArray(o)) return true;
+    return false;
+  }
+
+  function toArray(iter) {
+    return ('from' in Array) ? Array.from(iter) : Array.prototype.slice.call(iter);
+  }
+
+  (function() {
+
+    // Browsers may have:
+    // * No global URL object
+    // * URL with static methods only - may have a dummy constructor
+    // * URL with members except searchParams
+    // * Full URL API support
+    var origURL = global.URL;
+    var nativeURL;
+    try {
+      if (origURL) {
+        nativeURL = new global.URL('http://example.com');
+        if ('searchParams' in nativeURL) {
+					var url = new URL('http://example.com');
+					url.search = 'a=1&b=2';
+					if (url.href === 'http://example.com/?a=1&b=2') {
+						url.search = '';
+						if (url.href === 'http://example.com/') {
+							return;
+						}
+					}
+				}
+        if (!('href' in nativeURL)) {
+					nativeURL = undefined;
+				}
+				nativeURL = undefined;
+      }
+    } catch (_) {}
+
+    // NOTE: Doesn't do the encoding/decoding dance
+    function urlencoded_serialize(pairs) {
+      var output = '', first = true;
+      pairs.forEach(function (pair) {
+        var name = encodeURIComponent(pair.name);
+        var value = encodeURIComponent(pair.value);
+        if (!first) output += '&';
+        output += name + '=' + value;
+        first = false;
+      });
+      return output.replace(/%20/g, '+');
+    }
+
+    // NOTE: Doesn't do the encoding/decoding dance
+    function urlencoded_parse(input, isindex) {
+      var sequences = input.split('&');
+      if (isindex && sequences[0].indexOf('=') === -1)
+        sequences[0] = '=' + sequences[0];
+      var pairs = [];
+      sequences.forEach(function (bytes) {
+        if (bytes.length === 0) return;
+        var index = bytes.indexOf('=');
+        if (index !== -1) {
+          var name = bytes.substring(0, index);
+          var value = bytes.substring(index + 1);
+        } else {
+          name = bytes;
+          value = '';
+        }
+        name = name.replace(/\+/g, ' ');
+        value = value.replace(/\+/g, ' ');
+        pairs.push({ name: name, value: value });
+      });
+      var output = [];
+      pairs.forEach(function (pair) {
+        output.push({
+          name: decodeURIComponent(pair.name),
+          value: decodeURIComponent(pair.value)
+        });
+      });
+      return output;
+    }
+
+    function URLUtils(url) {
+      if (nativeURL)
+        return new origURL(url);
+      var anchor = document.createElement('a');
+      anchor.href = url;
+      return anchor;
+    }
+
+    function URLSearchParams(init) {
+      var $this = this;
+      this._list = [];
+
+      if (init === undefined || init === null) {
+        // no-op
+      } else if (init instanceof URLSearchParams) {
+        // In ES6 init would be a sequence, but special case for ES5.
+        this._list = urlencoded_parse(String(init));
+      } else if (typeof init === 'object' && isSequence(init)) {
+        toArray(init).forEach(function(e) {
+          if (!isSequence(e)) throw TypeError();
+          var nv = toArray(e);
+          if (nv.length !== 2) throw TypeError();
+          $this._list.push({name: String(nv[0]), value: String(nv[1])});
+        });
+      } else if (typeof init === 'object' && init) {
+        Object.keys(init).forEach(function(key) {
+          $this._list.push({name: String(key), value: String(init[key])});
+        });
+      } else {
+        init = String(init);
+        if (init.substring(0, 1) === '?')
+          init = init.substring(1);
+        this._list = urlencoded_parse(init);
+      }
+
+      this._url_object = null;
+      this._setList = function (list) { if (!updating) $this._list = list; };
+
+      var updating = false;
+      this._update_steps = function() {
+        if (updating) return;
+        updating = true;
+
+        if (!$this._url_object) return;
+
+        // Partial workaround for IE issue with 'about:'
+        if ($this._url_object.protocol === 'about:' &&
+            $this._url_object.pathname.indexOf('?') !== -1) {
+          $this._url_object.pathname = $this._url_object.pathname.split('?')[0];
+        }
+
+        $this._url_object.search = urlencoded_serialize($this._list);
+
+        updating = false;
+      };
+    }
+
+
+    Object.defineProperties(URLSearchParams.prototype, {
+      append: {
+        value: function (name, value) {
+          this._list.push({ name: name, value: value });
+          this._update_steps();
+        }, writable: true, enumerable: true, configurable: true
+      },
+
+      'delete': {
+        value: function (name) {
+          for (var i = 0; i < this._list.length;) {
+            if (this._list[i].name === name)
+              this._list.splice(i, 1);
+            else
+              ++i;
+          }
+          this._update_steps();
+        }, writable: true, enumerable: true, configurable: true
+      },
+
+      get: {
+        value: function (name) {
+          for (var i = 0; i < this._list.length; ++i) {
+            if (this._list[i].name === name)
+              return this._list[i].value;
+          }
+          return null;
+        }, writable: true, enumerable: true, configurable: true
+      },
+
+      getAll: {
+        value: function (name) {
+          var result = [];
+          for (var i = 0; i < this._list.length; ++i) {
+            if (this._list[i].name === name)
+              result.push(this._list[i].value);
+          }
+          return result;
+        }, writable: true, enumerable: true, configurable: true
+      },
+
+      has: {
+        value: function (name) {
+          for (var i = 0; i < this._list.length; ++i) {
+            if (this._list[i].name === name)
+              return true;
+          }
+          return false;
+        }, writable: true, enumerable: true, configurable: true
+      },
+
+      set: {
+        value: function (name, value) {
+          var found = false;
+          for (var i = 0; i < this._list.length;) {
+            if (this._list[i].name === name) {
+              if (!found) {
+                this._list[i].value = value;
+                found = true;
+                ++i;
+              } else {
+                this._list.splice(i, 1);
+              }
+            } else {
+              ++i;
+            }
+          }
+
+          if (!found)
+            this._list.push({ name: name, value: value });
+
+          this._update_steps();
+        }, writable: true, enumerable: true, configurable: true
+      },
+
+      entries: {
+        value: function() { return new Iterator(this._list, 'key+value'); },
+        writable: true, enumerable: true, configurable: true
+      },
+
+      keys: {
+        value: function() { return new Iterator(this._list, 'key'); },
+        writable: true, enumerable: true, configurable: true
+      },
+
+      values: {
+        value: function() { return new Iterator(this._list, 'value'); },
+        writable: true, enumerable: true, configurable: true
+      },
+
+      forEach: {
+        value: function(callback) {
+          var thisArg = (arguments.length > 1) ? arguments[1] : undefined;
+          this._list.forEach(function(pair) {
+            callback.call(thisArg, pair.value, pair.name);
+          });
+
+        }, writable: true, enumerable: true, configurable: true
+      },
+
+      toString: {
+        value: function () {
+          return urlencoded_serialize(this._list);
+        }, writable: true, enumerable: false, configurable: true
+      }
+    });
+
+    function Iterator(source, kind) {
+      var index = 0;
+      this['next'] = function() {
+        if (index >= source.length)
+          return {done: true, value: undefined};
+        var pair = source[index++];
+        return {done: false, value:
+                kind === 'key' ? pair.name :
+                kind === 'value' ? pair.value :
+                [pair.name, pair.value]};
+      };
+    }
+
+    if ('Symbol' in global && 'iterator' in global.Symbol) {
+      Object.defineProperty(URLSearchParams.prototype, global.Symbol.iterator, {
+        value: URLSearchParams.prototype.entries,
+        writable: true, enumerable: true, configurable: true});
+      Object.defineProperty(Iterator.prototype, global.Symbol.iterator, {
+        value: function() { return this; },
+        writable: true, enumerable: true, configurable: true});
+    }
+
+    function URL(url, base) {
+      if (!(this instanceof global.URL))
+        throw new TypeError("Failed to construct 'URL': Please use the 'new' operator.");
+
+      if (base) {
+        url = (function () {
+          if (nativeURL) return new origURL(url, base).href;
+          var iframe;
+          try {
+            var doc;
+            // Use another document/base tag/anchor for relative URL resolution, if possible
+            if (Object.prototype.toString.call(window.operamini) === "[object OperaMini]") {
+              iframe = document.createElement('iframe');
+              iframe.style.display = 'none';
+              document.documentElement.appendChild(iframe);
+              doc = iframe.contentWindow.document;
+            } else if (document.implementation && document.implementation.createHTMLDocument) {
+              doc = document.implementation.createHTMLDocument('');
+            } else if (document.implementation && document.implementation.createDocument) {
+              doc = document.implementation.createDocument('http://www.w3.org/1999/xhtml', 'html', null);
+              doc.documentElement.appendChild(doc.createElement('head'));
+              doc.documentElement.appendChild(doc.createElement('body'));
+            } else if (window.ActiveXObject) {
+              doc = new window.ActiveXObject('htmlfile');
+              doc.write('<head><\/head><body><\/body>');
+              doc.close();
+            }
+
+            if (!doc) throw Error('base not supported');
+
+            var baseTag = doc.createElement('base');
+            baseTag.href = base;
+            doc.getElementsByTagName('head')[0].appendChild(baseTag);
+            var anchor = doc.createElement('a');
+            anchor.href = url;
+            return anchor.href;
+          } finally {
+            if (iframe)
+              iframe.parentNode.removeChild(iframe);
+          }
+        }());
+      }
+
+      // An inner object implementing URLUtils (either a native URL
+      // object or an HTMLAnchorElement instance) is used to perform the
+      // URL algorithms. With full ES5 getter/setter support, return a
+      // regular object For IE8's limited getter/setter support, a
+      // different HTMLAnchorElement is returned with properties
+      // overridden
+
+      var instance = URLUtils(url || '');
+
+      // Detect for ES5 getter/setter support
+      // (an Object.defineProperties polyfill that doesn't support getters/setters may throw)
+      var ES5_GET_SET = (function() {
+        if (!('defineProperties' in Object)) return false;
+        try {
+          var obj = {};
+          Object.defineProperties(obj, { prop: { 'get': function () { return true; } } });
+          return obj.prop;
+        } catch (_) {
+          return false;
+        }
+      }());
+
+      var self = ES5_GET_SET ? this : document.createElement('a');
+
+
+
+      var query_object = new URLSearchParams(
+        instance.search ? instance.search.substring(1) : null);
+      query_object._url_object = self;
+
+      Object.defineProperties(self, {
+        href: {
+          get: function () { return instance.href; },
+          set: function (v) { instance.href = v; tidy_instance(); update_steps(); },
+          enumerable: true, configurable: true
+        },
+        origin: {
+          get: function () {
+            if ('origin' in instance) return instance.origin;
+            return this.protocol + '//' + this.host;
+          },
+          enumerable: true, configurable: true
+        },
+        protocol: {
+          get: function () { return instance.protocol; },
+          set: function (v) { instance.protocol = v; },
+          enumerable: true, configurable: true
+        },
+        username: {
+          get: function () { return instance.username; },
+          set: function (v) { instance.username = v; },
+          enumerable: true, configurable: true
+        },
+        password: {
+          get: function () { return instance.password; },
+          set: function (v) { instance.password = v; },
+          enumerable: true, configurable: true
+        },
+        host: {
+          get: function () {
+            // IE returns default port in |host|
+            var re = {'http:': /:80$/, 'https:': /:443$/, 'ftp:': /:21$/}[instance.protocol];
+            return re ? instance.host.replace(re, '') : instance.host;
+          },
+          set: function (v) { instance.host = v; },
+          enumerable: true, configurable: true
+        },
+        hostname: {
+          get: function () { return instance.hostname; },
+          set: function (v) { instance.hostname = v; },
+          enumerable: true, configurable: true
+        },
+        port: {
+          get: function () { return instance.port; },
+          set: function (v) { instance.port = v; },
+          enumerable: true, configurable: true
+        },
+        pathname: {
+          get: function () {
+            // IE does not include leading '/' in |pathname|
+            if (instance.pathname.charAt(0) !== '/') return '/' + instance.pathname;
+            return instance.pathname;
+          },
+          set: function (v) { instance.pathname = v; },
+          enumerable: true, configurable: true
+        },
+        search: {
+          get: function () { return instance.search; },
+          set: function (v) {
+            if (instance.search === v) return;
+            instance.search = v; tidy_instance(); update_steps();
+          },
+          enumerable: true, configurable: true
+        },
+        searchParams: {
+          get: function () { return query_object; },
+          enumerable: true, configurable: true
+        },
+        hash: {
+          get: function () { return instance.hash; },
+          set: function (v) { instance.hash = v; tidy_instance(); },
+          enumerable: true, configurable: true
+        },
+        toString: {
+          value: function() { return instance.toString(); },
+          enumerable: false, configurable: true
+        },
+        valueOf: {
+          value: function() { return instance.valueOf(); },
+          enumerable: false, configurable: true
+        }
+      });
+
+      function tidy_instance() {
+        var href = instance.href.replace(/#$|\?$|\?(?=#)/g, '');
+        if (instance.href !== href)
+          instance.href = href;
+      }
+
+      function update_steps() {
+        query_object._setList(instance.search ? urlencoded_parse(instance.search.substring(1)) : []);
+        query_object._update_steps();
+      }
+
+      return self;
+    }
+
+    if (origURL) {
+      for (var i in origURL) {
+        if (origURL.hasOwnProperty(i) && typeof origURL[i] === 'function')
+          URL[i] = origURL[i];
+      }
+    }
+
+    global.URL = URL;
+    global.URLSearchParams = URLSearchParams;
+  }());
+
+  // Patch native URLSearchParams constructor to handle sequences/records
+  // if necessary.
+  (function() {
+    if (new global.URLSearchParams([['a', 1]]).get('a') === '1' &&
+        new global.URLSearchParams({a: 1}).get('a') === '1')
+      return;
+    var orig = global.URLSearchParams;
+    global.URLSearchParams = function(init) {
+      if (init && typeof init === 'object' && isSequence(init)) {
+        var o = new orig();
+        toArray(init).forEach(function(e) {
+          if (!isSequence(e)) throw TypeError();
+          var nv = toArray(e);
+          if (nv.length !== 2) throw TypeError();
+          o.append(nv[0], nv[1]);
+        });
+        return o;
+      } else if (init && typeof init === 'object') {
+        o = new orig();
+        Object.keys(init).forEach(function(key) {
+          o.set(key, init[key]);
+        });
+        return o;
+      } else {
+        return new orig(init);
+      }
+    };
+  }());
+
+}(self));
diff --git a/wp-includes/js/dist/vendor/wp-polyfill-url.min.js b/wp-includes/js/dist/vendor/wp-polyfill-url.min.js
new file mode 100644
index 0000000000..29682d9b8c
--- /dev/null
+++ b/wp-includes/js/dist/vendor/wp-polyfill-url.min.js
@@ -0,0 +1 @@
+!function(f){"use strict";function i(e){return!!e&&("Symbol"in f&&"iterator"in f.Symbol&&"function"==typeof e[Symbol.iterator]||!!Array.isArray(e))}function o(e){return"from"in Array?Array.from(e):Array.prototype.slice.call(e)}!function(){var u,l=f.URL;try{if(l){if("searchParams"in(u=new f.URL("http://example.com"))){var e=new n("http://example.com");if(e.search="a=1&b=2","http://example.com/?a=1&b=2"===e.href&&(e.search="","http://example.com/"===e.href))return}"href"in u||(u=void 0),u=void 0}}catch(e){}function a(e){var r="",a=!0;return e.forEach(function(e){var t=encodeURIComponent(e.name),n=encodeURIComponent(e.value);a||(r+="&"),r+=t+"="+n,a=!1}),r.replace(/%20/g,"+")}function c(e,t){var n=e.split("&");t&&-1===n[0].indexOf("=")&&(n[0]="="+n[0]);var a=[];n.forEach(function(e){if(0!==e.length){var t=e.indexOf("=");if(-1!==t)var n=e.substring(0,t),r=e.substring(t+1);else n=e,r="";n=n.replace(/\+/g," "),r=r.replace(/\+/g," "),a.push({name:n,value:r})}});var r=[];return a.forEach(function(e){r.push({name:decodeURIComponent(e.name),value:decodeURIComponent(e.value)})}),r}function s(t){var n=this;this._list=[],null==t||(t instanceof s?this._list=c(String(t)):"object"==typeof t&&i(t)?o(t).forEach(function(e){if(!i(e))throw TypeError();var t=o(e);if(2!==t.length)throw TypeError();n._list.push({name:String(t[0]),value:String(t[1])})}):"object"==typeof t&&t?Object.keys(t).forEach(function(e){n._list.push({name:String(e),value:String(t[e])})}):("?"===(t=String(t)).substring(0,1)&&(t=t.substring(1)),this._list=c(t))),this._url_object=null;var r=!(this._setList=function(e){r||(n._list=e)});this._update_steps=function(){r||(r=!0,n._url_object&&("about:"===n._url_object.protocol&&-1!==n._url_object.pathname.indexOf("?")&&(n._url_object.pathname=n._url_object.pathname.split("?")[0]),n._url_object.search=a(n._list),r=!1))}}function t(t,n){var r=0;this.next=function(){if(r>=t.length)return{done:!0,value:void 0};var e=t[r++];return{done:!1,value:"key"===n?e.name:"value"===n?e.value:[e.name,e.value]}}}function n(a,i){if(!(this instanceof f.URL))throw new TypeError("Failed to construct 'URL': Please use the 'new' operator.");i&&(a=function(){if(u)return new l(a,i).href;var e;try{var t;if("[object OperaMini]"===Object.prototype.toString.call(window.operamini)?((e=document.createElement("iframe")).style.display="none",document.documentElement.appendChild(e),t=e.contentWindow.document):document.implementation&&document.implementation.createHTMLDocument?t=document.implementation.createHTMLDocument(""):document.implementation&&document.implementation.createDocument?((t=document.implementation.createDocument("http://www.w3.org/1999/xhtml","html",null)).documentElement.appendChild(t.createElement("head")),t.documentElement.appendChild(t.createElement("body"))):window.ActiveXObject&&((t=new window.ActiveXObject("htmlfile")).write("<head></head><body></body>"),t.close()),!t)throw Error("base not supported");var n=t.createElement("base");n.href=i,t.getElementsByTagName("head")[0].appendChild(n);var r=t.createElement("a");return r.href=a,r.href}finally{e&&e.parentNode.removeChild(e)}}());var t=function(e){if(u)return new l(e);var t=document.createElement("a");return t.href=e,t}(a||""),e=function(){if(!("defineProperties"in Object))return!1;try{var e={};return Object.defineProperties(e,{prop:{get:function(){return!0}}}),e.prop}catch(e){return!1}}()?this:document.createElement("a"),n=new s(t.search?t.search.substring(1):null);function r(){var e=t.href.replace(/#$|\?$|\?(?=#)/g,"");t.href!==e&&(t.href=e)}function o(){n._setList(t.search?c(t.search.substring(1)):[]),n._update_steps()}return n._url_object=e,Object.defineProperties(e,{href:{get:function(){return t.href},set:function(e){t.href=e,r(),o()},enumerable:!0,configurable:!0},origin:{get:function(){return"origin"in t?t.origin:this.protocol+"//"+this.host},enumerable:!0,configurable:!0},protocol:{get:function(){return t.protocol},set:function(e){t.protocol=e},enumerable:!0,configurable:!0},username:{get:function(){return t.username},set:function(e){t.username=e},enumerable:!0,configurable:!0},password:{get:function(){return t.password},set:function(e){t.password=e},enumerable:!0,configurable:!0},host:{get:function(){var e={"http:":/:80$/,"https:":/:443$/,"ftp:":/:21$/}[t.protocol];return e?t.host.replace(e,""):t.host},set:function(e){t.host=e},enumerable:!0,configurable:!0},hostname:{get:function(){return t.hostname},set:function(e){t.hostname=e},enumerable:!0,configurable:!0},port:{get:function(){return t.port},set:function(e){t.port=e},enumerable:!0,configurable:!0},pathname:{get:function(){return"/"!==t.pathname.charAt(0)?"/"+t.pathname:t.pathname},set:function(e){t.pathname=e},enumerable:!0,configurable:!0},search:{get:function(){return t.search},set:function(e){t.search!==e&&(t.search=e,r(),o())},enumerable:!0,configurable:!0},searchParams:{get:function(){return 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t},writable:!0,enumerable:!0,configurable:!0},has:{value:function(e){for(var t=0;t<this._list.length;++t)if(this._list[t].name===e)return!0;return!1},writable:!0,enumerable:!0,configurable:!0},set:{value:function(e,t){for(var n=!1,r=0;r<this._list.length;)this._list[r].name===e?n?this._list.splice(r,1):(this._list[r].value=t,n=!0,++r):++r;n||this._list.push({name:e,value:t}),this._update_steps()},writable:!0,enumerable:!0,configurable:!0},entries:{value:function(){return new t(this._list,"key+value")},writable:!0,enumerable:!0,configurable:!0},keys:{value:function(){return new t(this._list,"key")},writable:!0,enumerable:!0,configurable:!0},values:{value:function(){return new t(this._list,"value")},writable:!0,enumerable:!0,configurable:!0},forEach:{value:function(t){var n=1<arguments.length?arguments[1]:void 0;this._list.forEach(function(e){t.call(n,e.value,e.name)})},writable:!0,enumerable:!0,configurable:!0},toString:{value:function(){return a(this._list)},writable:!0,enumerable:!1,configurable:!0}}),"Symbol"in f&&"iterator"in f.Symbol&&(Object.defineProperty(s.prototype,f.Symbol.iterator,{value:s.prototype.entries,writable:!0,enumerable:!0,configurable:!0}),Object.defineProperty(t.prototype,f.Symbol.iterator,{value:function(){return this},writable:!0,enumerable:!0,configurable:!0})),l)for(var r in l)l.hasOwnProperty(r)&&"function"==typeof l[r]&&(n[r]=l[r]);f.URL=n,f.URLSearchParams=s}(),function(){if("1"!==new f.URLSearchParams([["a",1]]).get("a")||"1"!==new f.URLSearchParams({a:1}).get("a")){var e=f.URLSearchParams;f.URLSearchParams=function(t){if(t&&"object"==typeof t&&i(t)){var n=new e;return o(t).forEach(function(e){if(!i(e))throw TypeError();var t=o(e);if(2!==t.length)throw TypeError();n.append(t[0],t[1])}),n}return t&&"object"==typeof t?(n=new e,Object.keys(t).forEach(function(e){n.set(e,t[e])}),n):new e(t)}}}()}(self);
\ No newline at end of file
diff --git a/wp-includes/script-loader.php b/wp-includes/script-loader.php
index cdb479c547..445d66aeaf 100644
--- a/wp-includes/script-loader.php
+++ b/wp-includes/script-loader.php
@@ -86,6 +86,8 @@ function wp_default_packages_vendor( &$scripts ) {
 		'wp-polyfill-fetch',
 		'wp-polyfill-formdata',
 		'wp-polyfill-node-contains',
+		'wp-polyfill-url',
+		'wp-polyfill-dom-rect',
 		'wp-polyfill-element-closest',
 		'wp-polyfill',
 	);
@@ -97,7 +99,9 @@ function wp_default_packages_vendor( &$scripts ) {
 		'lodash'                      => '4.17.15',
 		'wp-polyfill-fetch'           => '3.0.0',
 		'wp-polyfill-formdata'        => '3.0.12',
-		'wp-polyfill-node-contains'   => '3.26.0-0',
+		'wp-polyfill-node-contains'   => '3.42.0',
+		'wp-polyfill-url'             => '3.42.0',
+		'wp-polyfill-dom-rect'        => '3.42.0',
 		'wp-polyfill-element-closest' => '2.0.2',
 		'wp-polyfill'                 => '7.4.4',
 	);
@@ -122,6 +126,8 @@ function wp_default_packages_vendor( &$scripts ) {
 			array(
 				'\'fetch\' in window' => 'wp-polyfill-fetch',
 				'document.contains'   => 'wp-polyfill-node-contains',
+				'window.URL'          => 'wp-polyfill-url',
+				'window.DOMRect'      => 'wp-polyfill-dom-rect',
 				'window.FormData && window.FormData.prototype.keys' => 'wp-polyfill-formdata',
 				'Element.prototype.matches && Element.prototype.closest' => 'wp-polyfill-element-closest',
 			)
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ff69c4ded0..19e5cc6d50 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.4-alpha-47237';
+$wp_version = '5.4-alpha-47238';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.