diff --git a/wp-includes/js/dist/vendor/wp-polyfill-fetch.min.js b/wp-includes/js/dist/vendor/wp-polyfill-fetch.min.js
index b34c007379..6a28ae779d 100644
--- a/wp-includes/js/dist/vendor/wp-polyfill-fetch.min.js
+++ b/wp-includes/js/dist/vendor/wp-polyfill-fetch.min.js
@@ -1 +1 @@
-!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e(t.WHATWGFetch={})}(this,function(a){"use strict";var e="URLSearchParams"in self,r="Symbol"in self&&"iterator"in Symbol,h="FileReader"in self&&"Blob"in self&&function(){try{return new Blob,!0}catch(t){return!1}}(),o="FormData"in self,n="ArrayBuffer"in self;if(n)var i=["[object Int8Array]","[object Uint8Array]","[object Uint8ClampedArray]","[object Int16Array]","[object Uint16Array]","[object Int32Array]","[object Uint32Array]","[object Float32Array]","[object Float64Array]"],s=ArrayBuffer.isView||function(t){return t&&-1<i.indexOf(Object.prototype.toString.call(t))};function u(t){if("string"!=typeof t&&(t=String(t)),/[^a-z0-9\-#$%&'*+.^_`|~]/i.test(t))throw new TypeError("Invalid character in header field name");return t.toLowerCase()}function f(t){return"string"!=typeof t&&(t=String(t)),t}function t(e){var t={next:function(){var t=e.shift();return{done:void 0===t,value:t}}};return r&&(t[Symbol.iterator]=function(){return t}),t}function d(e){this.map={},e instanceof d?e.forEach(function(t,e){this.append(e,t)},this):Array.isArray(e)?e.forEach(function(t){this.append(t[0],t[1])},this):e&&Object.getOwnPropertyNames(e).forEach(function(t){this.append(t,e[t])},this)}function c(t){if(t.bodyUsed)return Promise.reject(new TypeError("Already read"));t.bodyUsed=!0}function p(r){return new Promise(function(t,e){r.onload=function(){t(r.result)},r.onerror=function(){e(r.error)}})}function y(t){var e=new FileReader,r=p(e);return e.readAsArrayBuffer(t),r}function l(t){if(t.slice)return t.slice(0);var e=new Uint8Array(t.byteLength);return e.set(new Uint8Array(t)),e.buffer}function b(){return this.bodyUsed=!1,this._initBody=function(t){(this._bodyInit=t)?"string"==typeof t?this._bodyText=t:h&&Blob.prototype.isPrototypeOf(t)?this._bodyBlob=t:o&&FormData.prototype.isPrototypeOf(t)?this._bodyFormData=t:e&&URLSearchParams.prototype.isPrototypeOf(t)?this._bodyText=t.toString():n&&h&&function(t){return t&&DataView.prototype.isPrototypeOf(t)}(t)?(this._bodyArrayBuffer=l(t.buffer),this._bodyInit=new Blob([this._bodyArrayBuffer])):n&&(ArrayBuffer.prototype.isPrototypeOf(t)||s(t))?this._bodyArrayBuffer=l(t):this._bodyText=t=Object.prototype.toString.call(t):this._bodyText="",this.headers.get("content-type")||("string"==typeof t?this.headers.set("content-type","text/plain;charset=UTF-8"):this._bodyBlob&&this._bodyBlob.type?this.headers.set("content-type",this._bodyBlob.type):e&&URLSearchParams.prototype.isPrototypeOf(t)&&this.headers.set("content-type","application/x-www-form-urlencoded;charset=UTF-8"))},h&&(this.blob=function(){var t=c(this);if(t)return t;if(this._bodyBlob)return Promise.resolve(this._bodyBlob);if(this._bodyArrayBuffer)return Promise.resolve(new Blob([this._bodyArrayBuffer]));if(this._bodyFormData)throw new Error("could not read FormData body as blob");return Promise.resolve(new Blob([this._bodyText]))},this.arrayBuffer=function(){return this._bodyArrayBuffer?c(this)||Promise.resolve(this._bodyArrayBuffer):this.blob().then(y)}),this.text=function(){var t=c(this);if(t)return t;if(this._bodyBlob)return function(t){var e=new FileReader,r=p(e);return e.readAsText(t),r}(this._bodyBlob);if(this._bodyArrayBuffer)return Promise.resolve(function(t){for(var e=new Uint8Array(t),r=new Array(e.length),o=0;o<e.length;o++)r[o]=String.fromCharCode(e[o]);return r.join("")}(this._bodyArrayBuffer));if(this._bodyFormData)throw new Error("could not read FormData body as text");return Promise.resolve(this._bodyText)},o&&(this.formData=function(){return this.text().then(v)}),this.json=function(){return this.text().then(JSON.parse)},this}d.prototype.append=function(t,e){t=u(t),e=f(e);var r=this.map[t];this.map[t]=r?r+", "+e:e},d.prototype.delete=function(t){delete this.map[u(t)]},d.prototype.get=function(t){return t=u(t),this.has(t)?this.map[t]:null},d.prototype.has=function(t){return this.map.hasOwnProperty(u(t))},d.prototype.set=function(t,e){this.map[u(t)]=f(e)},d.prototype.forEach=function(t,e){for(var r in this.map)this.map.hasOwnProperty(r)&&t.call(e,this.map[r],r,this)},d.prototype.keys=function(){var r=[];return this.forEach(function(t,e){r.push(e)}),t(r)},d.prototype.values=function(){var e=[];return this.forEach(function(t){e.push(t)}),t(e)},d.prototype.entries=function(){var r=[];return this.forEach(function(t,e){r.push([e,t])}),t(r)},r&&(d.prototype[Symbol.iterator]=d.prototype.entries);var m=["DELETE","GET","HEAD","OPTIONS","POST","PUT"];function w(t,e){var r=(e=e||{}).body;if(t instanceof w){if(t.bodyUsed)throw new TypeError("Already read");this.url=t.url,this.credentials=t.credentials,e.headers||(this.headers=new d(t.headers)),this.method=t.method,this.mode=t.mode,this.signal=t.signal,r||null==t._bodyInit||(r=t._bodyInit,t.bodyUsed=!0)}else this.url=String(t);if(this.credentials=e.credentials||this.credentials||"same-origin",!e.headers&&this.headers||(this.headers=new d(e.headers)),this.method=function(t){var e=t.toUpperCase();return-1<m.indexOf(e)?e:t}(e.method||this.method||"GET"),this.mode=e.mode||this.mode||null,this.signal=e.signal||this.signal,this.referrer=null,("GET"===this.method||"HEAD"===this.method)&&r)throw new TypeError("Body not allowed for GET or HEAD requests");this._initBody(r)}function v(t){var n=new FormData;return t.trim().split("&").forEach(function(t){if(t){var e=t.split("="),r=e.shift().replace(/\+/g," "),o=e.join("=").replace(/\+/g," ");n.append(decodeURIComponent(r),decodeURIComponent(o))}}),n}function E(t,e){e||(e={}),this.type="default",this.status=void 0===e.status?200:e.status,this.ok=200<=this.status&&this.status<300,this.statusText="statusText"in e?e.statusText:"OK",this.headers=new d(e.headers),this.url=e.url||"",this._initBody(t)}w.prototype.clone=function(){return new w(this,{body:this._bodyInit})},b.call(w.prototype),b.call(E.prototype),E.prototype.clone=function(){return new E(this._bodyInit,{status:this.status,statusText:this.statusText,headers:new d(this.headers),url:this.url})},E.error=function(){var t=new E(null,{status:0,statusText:""});return t.type="error",t};var A=[301,302,303,307,308];E.redirect=function(t,e){if(-1===A.indexOf(e))throw new RangeError("Invalid status code");return new E(null,{status:e,headers:{location:t}})},a.DOMException=self.DOMException;try{new a.DOMException}catch(t){a.DOMException=function(t,e){this.message=t,this.name=e;var r=Error(t);this.stack=r.stack},a.DOMException.prototype=Object.create(Error.prototype),a.DOMException.prototype.constructor=a.DOMException}function _(i,s){return new Promise(function(r,t){var e=new w(i,s);if(e.signal&&e.signal.aborted)return t(new a.DOMException("Aborted","AbortError"));var o=new XMLHttpRequest;function n(){o.abort()}o.onload=function(){var t={status:o.status,statusText:o.statusText,headers:function(t){var n=new d;return t.replace(/\r?\n[\t ]+/g," ").split(/\r?\n/).forEach(function(t){var e=t.split(":"),r=e.shift().trim();if(r){var o=e.join(":").trim();n.append(r,o)}}),n}(o.getAllResponseHeaders()||"")};t.url="responseURL"in o?o.responseURL:t.headers.get("X-Request-URL");var e="response"in o?o.response:o.responseText;r(new E(e,t))},o.onerror=function(){t(new TypeError("Network request failed"))},o.ontimeout=function(){t(new TypeError("Network request failed"))},o.onabort=function(){t(new a.DOMException("Aborted","AbortError"))},o.open(e.method,e.url,!0),"include"===e.credentials?o.withCredentials=!0:"omit"===e.credentials&&(o.withCredentials=!1),"responseType"in o&&h&&(o.responseType="blob"),e.headers.forEach(function(t,e){o.setRequestHeader(e,t)}),e.signal&&(e.signal.addEventListener("abort",n),o.onreadystatechange=function(){4===o.readyState&&e.signal.removeEventListener("abort",n)}),o.send(void 0===e._bodyInit?null:e._bodyInit)})}_.polyfill=!0,self.fetch||(self.fetch=_,self.Headers=d,self.Request=w,self.Response=E),a.Headers=d,a.Request=w,a.Response=E,a.fetch=_,Object.defineProperty(a,"__esModule",{value:!0})});
\ No newline at end of file
+!function(t,e){"object"==typeof exports&&"undefined"!=typeof module?e(exports):"function"==typeof define&&define.amd?define(["exports"],e):e(t.WHATWGFetch={})}(this,function(a){"use strict";var r="URLSearchParams"in self,o="Symbol"in self&&"iterator"in Symbol,h="FileReader"in self&&"Blob"in self&&function(){try{return new Blob,!0}catch(t){return!1}}(),n="FormData"in self,i="ArrayBuffer"in self;if(i)var e=["[object Int8Array]","[object Uint8Array]","[object Uint8ClampedArray]","[object Int16Array]","[object Uint16Array]","[object Int32Array]","[object Uint32Array]","[object Float32Array]","[object Float64Array]"],s=ArrayBuffer.isView||function(t){return t&&-1<e.indexOf(Object.prototype.toString.call(t))};function u(t){if("string"!=typeof t&&(t=String(t)),/[^a-z0-9\-#$%&'*+.^_`|~]/i.test(t))throw new TypeError("Invalid character in header field name");return t.toLowerCase()}function f(t){return"string"!=typeof t&&(t=String(t)),t}function t(e){var t={next:function(){var t=e.shift();return{done:void 0===t,value:t}}};return o&&(t[Symbol.iterator]=function(){return t}),t}function d(e){this.map={},e instanceof d?e.forEach(function(t,e){this.append(e,t)},this):Array.isArray(e)?e.forEach(function(t){this.append(t[0],t[1])},this):e&&Object.getOwnPropertyNames(e).forEach(function(t){this.append(t,e[t])},this)}function c(t){if(t.bodyUsed)return Promise.reject(new TypeError("Already read"));t.bodyUsed=!0}function p(r){return new Promise(function(t,e){r.onload=function(){t(r.result)},r.onerror=function(){e(r.error)}})}function y(t){var e=new FileReader,r=p(e);return e.readAsArrayBuffer(t),r}function l(t){if(t.slice)return t.slice(0);var e=new Uint8Array(t.byteLength);return e.set(new Uint8Array(t)),e.buffer}function b(){return this.bodyUsed=!1,this._initBody=function(t){var e;(this._bodyInit=t)?"string"==typeof t?this._bodyText=t:h&&Blob.prototype.isPrototypeOf(t)?this._bodyBlob=t:n&&FormData.prototype.isPrototypeOf(t)?this._bodyFormData=t:r&&URLSearchParams.prototype.isPrototypeOf(t)?this._bodyText=t.toString():i&&h&&((e=t)&&DataView.prototype.isPrototypeOf(e))?(this._bodyArrayBuffer=l(t.buffer),this._bodyInit=new Blob([this._bodyArrayBuffer])):i&&(ArrayBuffer.prototype.isPrototypeOf(t)||s(t))?this._bodyArrayBuffer=l(t):this._bodyText=t=Object.prototype.toString.call(t):this._bodyText="",this.headers.get("content-type")||("string"==typeof t?this.headers.set("content-type","text/plain;charset=UTF-8"):this._bodyBlob&&this._bodyBlob.type?this.headers.set("content-type",this._bodyBlob.type):r&&URLSearchParams.prototype.isPrototypeOf(t)&&this.headers.set("content-type","application/x-www-form-urlencoded;charset=UTF-8"))},h&&(this.blob=function(){var t=c(this);if(t)return t;if(this._bodyBlob)return Promise.resolve(this._bodyBlob);if(this._bodyArrayBuffer)return Promise.resolve(new Blob([this._bodyArrayBuffer]));if(this._bodyFormData)throw new Error("could not read FormData body as blob");return Promise.resolve(new Blob([this._bodyText]))},this.arrayBuffer=function(){return this._bodyArrayBuffer?c(this)||Promise.resolve(this._bodyArrayBuffer):this.blob().then(y)}),this.text=function(){var t,e,r,o=c(this);if(o)return o;if(this._bodyBlob)return t=this._bodyBlob,e=new FileReader,r=p(e),e.readAsText(t),r;if(this._bodyArrayBuffer)return Promise.resolve(function(t){for(var e=new Uint8Array(t),r=new Array(e.length),o=0;o<e.length;o++)r[o]=String.fromCharCode(e[o]);return r.join("")}(this._bodyArrayBuffer));if(this._bodyFormData)throw new Error("could not read FormData body as text");return Promise.resolve(this._bodyText)},n&&(this.formData=function(){return this.text().then(v)}),this.json=function(){return this.text().then(JSON.parse)},this}d.prototype.append=function(t,e){t=u(t),e=f(e);var r=this.map[t];this.map[t]=r?r+", "+e:e},d.prototype.delete=function(t){delete this.map[u(t)]},d.prototype.get=function(t){return t=u(t),this.has(t)?this.map[t]:null},d.prototype.has=function(t){return this.map.hasOwnProperty(u(t))},d.prototype.set=function(t,e){this.map[u(t)]=f(e)},d.prototype.forEach=function(t,e){for(var r in this.map)this.map.hasOwnProperty(r)&&t.call(e,this.map[r],r,this)},d.prototype.keys=function(){var r=[];return this.forEach(function(t,e){r.push(e)}),t(r)},d.prototype.values=function(){var e=[];return this.forEach(function(t){e.push(t)}),t(e)},d.prototype.entries=function(){var r=[];return this.forEach(function(t,e){r.push([e,t])}),t(r)},o&&(d.prototype[Symbol.iterator]=d.prototype.entries);var m=["DELETE","GET","HEAD","OPTIONS","POST","PUT"];function w(t,e){var r,o,n=(e=e||{}).body;if(t instanceof w){if(t.bodyUsed)throw new TypeError("Already read");this.url=t.url,this.credentials=t.credentials,e.headers||(this.headers=new d(t.headers)),this.method=t.method,this.mode=t.mode,this.signal=t.signal,n||null==t._bodyInit||(n=t._bodyInit,t.bodyUsed=!0)}else this.url=String(t);if(this.credentials=e.credentials||this.credentials||"same-origin",!e.headers&&this.headers||(this.headers=new d(e.headers)),this.method=(r=e.method||this.method||"GET",o=r.toUpperCase(),-1<m.indexOf(o)?o:r),this.mode=e.mode||this.mode||null,this.signal=e.signal||this.signal,this.referrer=null,("GET"===this.method||"HEAD"===this.method)&&n)throw new TypeError("Body not allowed for GET or HEAD requests");this._initBody(n)}function v(t){var n=new FormData;return t.trim().split("&").forEach(function(t){if(t){var e=t.split("="),r=e.shift().replace(/\+/g," "),o=e.join("=").replace(/\+/g," ");n.append(decodeURIComponent(r),decodeURIComponent(o))}}),n}function E(t,e){e||(e={}),this.type="default",this.status=void 0===e.status?200:e.status,this.ok=200<=this.status&&this.status<300,this.statusText="statusText"in e?e.statusText:"OK",this.headers=new d(e.headers),this.url=e.url||"",this._initBody(t)}w.prototype.clone=function(){return new w(this,{body:this._bodyInit})},b.call(w.prototype),b.call(E.prototype),E.prototype.clone=function(){return new E(this._bodyInit,{status:this.status,statusText:this.statusText,headers:new d(this.headers),url:this.url})},E.error=function(){var t=new E(null,{status:0,statusText:""});return t.type="error",t};var A=[301,302,303,307,308];E.redirect=function(t,e){if(-1===A.indexOf(e))throw new RangeError("Invalid status code");return new E(null,{status:e,headers:{location:t}})},a.DOMException=self.DOMException;try{new a.DOMException}catch(t){a.DOMException=function(t,e){this.message=t,this.name=e;var r=Error(t);this.stack=r.stack},a.DOMException.prototype=Object.create(Error.prototype),a.DOMException.prototype.constructor=a.DOMException}function _(n,s){return new Promise(function(o,t){var e=new w(n,s);if(e.signal&&e.signal.aborted)return t(new a.DOMException("Aborted","AbortError"));var i=new XMLHttpRequest;function r(){i.abort()}i.onload=function(){var t,n,e={status:i.status,statusText:i.statusText,headers:(t=i.getAllResponseHeaders()||"",n=new d,t.replace(/\r?\n[\t ]+/g," ").split(/\r?\n/).forEach(function(t){var e=t.split(":"),r=e.shift().trim();if(r){var o=e.join(":").trim();n.append(r,o)}}),n)};e.url="responseURL"in i?i.responseURL:e.headers.get("X-Request-URL");var r="response"in i?i.response:i.responseText;o(new E(r,e))},i.onerror=function(){t(new TypeError("Network request failed"))},i.ontimeout=function(){t(new TypeError("Network request failed"))},i.onabort=function(){t(new a.DOMException("Aborted","AbortError"))},i.open(e.method,e.url,!0),"include"===e.credentials?i.withCredentials=!0:"omit"===e.credentials&&(i.withCredentials=!1),"responseType"in i&&h&&(i.responseType="blob"),e.headers.forEach(function(t,e){i.setRequestHeader(e,t)}),e.signal&&(e.signal.addEventListener("abort",r),i.onreadystatechange=function(){4===i.readyState&&e.signal.removeEventListener("abort",r)}),i.send(void 0===e._bodyInit?null:e._bodyInit)})}_.polyfill=!0,self.fetch||(self.fetch=_,self.Headers=d,self.Request=w,self.Response=E),a.Headers=d,a.Request=w,a.Response=E,a.fetch=_,Object.defineProperty(a,"__esModule",{value:!0})});
\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index fe0cf8a36b..31c88c8afe 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.3-alpha-45445';
+$wp_version = '5.3-alpha-45446';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.