diff --git a/wp-admin/admin-header.php b/wp-admin/admin-header.php
index 53e3c06cfd..235468f146 100644
--- a/wp-admin/admin-header.php
+++ b/wp-admin/admin-header.php
@@ -203,7 +203,7 @@ if ( is_network_admin() ) {
 	$admin_body_class .= ' network-admin';
 }
 
-$admin_body_class .= ' no-customize-support no-svg';
+$admin_body_class .= ' no-customize-support svg';
 
 if ( $current_screen->is_block_editor() ) {
 	$admin_body_class .= ' block-editor-page wp-embed-responsive';
diff --git a/wp-admin/js/svg-painter.js b/wp-admin/js/svg-painter.js
index a356735446..6a99d070d7 100644
--- a/wp-admin/js/svg-painter.js
+++ b/wp-admin/js/svg-painter.js
@@ -8,123 +8,22 @@ window.wp = window.wp || {};
 
 wp.svgPainter = ( function( $, window, document, undefined ) {
 	'use strict';
-	var selector, base64, painter,
+	var selector, painter,
 		colorscheme = {},
 		elements = [];
 
 	$( function() {
-		// Detection for browser SVG capability.
-		if ( document.implementation.hasFeature( 'http://www.w3.org/TR/SVG11/feature#Image', '1.1' ) ) {
-			$( document.body ).removeClass( 'no-svg' ).addClass( 'svg' );
-			wp.svgPainter.init();
-		}
+		wp.svgPainter.init();
 	});
 
-	/**
-	 * Needed only for IE9
-	 *
-	 * Based on jquery.base64.js 0.0.3 - https://github.com/yckart/jquery.base64.js
-	 *
-	 * Based on: https://gist.github.com/Yaffle/1284012
-	 *
-	 * Copyright (c) 2012 Yannick Albert (http://yckart.com)
-	 * Licensed under the MIT license
-	 * http://www.opensource.org/licenses/mit-license.php
-	 */
-	base64 = ( function() {
-		var c,
-			b64 = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/',
-			a256 = '',
-			r64 = [256],
-			r256 = [256],
-			i = 0;
-
-		function init() {
-			while( i < 256 ) {
-				c = String.fromCharCode(i);
-				a256 += c;
-				r256[i] = i;
-				r64[i] = b64.indexOf(c);
-				++i;
-			}
-		}
-
-		function code( s, discard, alpha, beta, w1, w2 ) {
-			var tmp, length,
-				buffer = 0,
-				i = 0,
-				result = '',
-				bitsInBuffer = 0;
-
-			s = String(s);
-			length = s.length;
-
-			while( i < length ) {
-				c = s.charCodeAt(i);
-				c = c < 256 ? alpha[c] : -1;
-
-				buffer = ( buffer << w1 ) + c;
-				bitsInBuffer += w1;
-
-				while( bitsInBuffer >= w2 ) {
-					bitsInBuffer -= w2;
-					tmp = buffer >> bitsInBuffer;
-					result += beta.charAt(tmp);
-					buffer ^= tmp << bitsInBuffer;
-				}
-				++i;
-			}
-
-			if ( ! discard && bitsInBuffer > 0 ) {
-				result += beta.charAt( buffer << ( w2 - bitsInBuffer ) );
-			}
-
-			return result;
-		}
-
-		function btoa( plain ) {
-			if ( ! c ) {
-				init();
-			}
-
-			plain = code( plain, false, r256, b64, 8, 6 );
-			return plain + '===='.slice( ( plain.length % 4 ) || 4 );
-		}
-
-		function atob( coded ) {
-			var i;
-
-			if ( ! c ) {
-				init();
-			}
-
-			coded = coded.replace( /[^A-Za-z0-9\+\/\=]/g, '' );
-			coded = String(coded).split('=');
-			i = coded.length;
-
-			do {
-				--i;
-				coded[i] = code( coded[i], true, r64, a256, 6, 8 );
-			} while ( i > 0 );
-
-			coded = coded.join('');
-			return coded;
-		}
-
-		return {
-			atob: atob,
-			btoa: btoa
-		};
-	})();
-
 	return {
 		init: function() {
 			painter = this;
 			selector = $( '#adminmenu .wp-menu-image, #wpadminbar .ab-item' );
 
-			this.setColors();
-			this.findElements();
-			this.paint();
+			painter.setColors();
+			painter.findElements();
+			painter.paint();
 		},
 
 		setColors: function( colors ) {
@@ -201,11 +100,7 @@ wp.svgPainter = ( function( $, window, document, undefined ) {
 				}
 
 				try {
-					if ( 'atob' in window ) {
-						xml = window.atob( encoded[1] );
-					} else {
-						xml = base64.atob( encoded[1] );
-					}
+					xml = window.atob( encoded[1] );
 				} catch ( error ) {}
 
 				if ( xml ) {
@@ -218,11 +113,7 @@ wp.svgPainter = ( function( $, window, document, undefined ) {
 					// Replace `fill` properties in `<style>` tags.
 					xml = xml.replace( /fill:.*?;/g, 'fill: ' + color + ';');
 
-					if ( 'btoa' in window ) {
-						xml = window.btoa( xml );
-					} else {
-						xml = base64.btoa( xml );
-					}
+					xml = window.btoa( xml );
 
 					$element.data( 'wp-ui-svg-' + color, xml );
 				} else {
diff --git a/wp-admin/js/svg-painter.min.js b/wp-admin/js/svg-painter.min.js
index a6f012e8b1..459c2b1007 100644
--- a/wp-admin/js/svg-painter.min.js
+++ b/wp-admin/js/svg-painter.min.js
@@ -1,2 +1,2 @@
 /*! This file is auto-generated */
-window.wp=window.wp||{},wp.svgPainter=function(e,i,n){"use strict";var t,o,a,m,r,s,c,u,l,f={},g=[];function p(){for(;l<256;)m=String.fromCharCode(l),s+=m,u[l]=l,c[l]=r.indexOf(m),++l}function d(n,t,e,a,i,o){for(var r,s=0,c=0,u="",l=0,f=(n=String(n)).length;c<f;){for(s=(s<<i)+(m=(m=n.charCodeAt(c))<256?e[m]:-1),l+=i;o<=l;)l-=o,u+=a.charAt(r=s>>l),s^=r<<l;++c}return!t&&0<l&&(u+=a.charAt(s<<o-l)),u}return e(function(){n.implementation.hasFeature("http://www.w3.org/TR/SVG11/feature#Image","1.1")&&(e(n.body).removeClass("no-svg").addClass("svg"),wp.svgPainter.init())}),r="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",s="",c=[256],u=[256],l=0,o={atob:function(n){var t;for(m||p(),n=n.replace(/[^A-Za-z0-9\+\/\=]/g,""),t=(n=String(n).split("=")).length;n[--t]=d(n[t],!0,c,s,6,8),0<t;);return n=n.join("")},btoa:function(n){return m||p(),(n=d(n,!1,u,r,8,6))+"====".slice(n.length%4||4)}},{init:function(){a=this,t=e("#adminmenu .wp-menu-image, #wpadminbar .ab-item"),this.setColors(),this.findElements(),this.paint()},setColors:function(n){(n=void 0===n&&void 0!==i._wpColorScheme?i._wpColorScheme:n)&&n.icons&&n.icons.base&&n.icons.current&&n.icons.focus&&(f=n.icons)},findElements:function(){t.each(function(){var n=e(this),t=n.css("background-image");t&&-1!=t.indexOf("data:image/svg+xml;base64")&&g.push(n)})},paint:function(){e.each(g,function(n,t){var e=t.parent().parent();e.hasClass("current")||e.hasClass("wp-has-current-submenu")?a.paintElement(t,"current"):(a.paintElement(t,"base"),e.on("mouseenter",function(){a.paintElement(t,"focus")}).on("mouseleave",function(){i.setTimeout(function(){a.paintElement(t,"base")},100)}))})},paintElement:function(n,t){var e,a;if(t&&f.hasOwnProperty(t)&&(t=f[t]).match(/^(#[0-9a-f]{3}|#[0-9a-f]{6})$/i)&&"none"!==(e=n.data("wp-ui-svg-"+t))){if(!e){if(!(a=n.css("background-image").match(/.+data:image\/svg\+xml;base64,([A-Za-z0-9\+\/\=]+)/))||!a[1])return void n.data("wp-ui-svg-"+t,"none");try{e=("atob"in i?i:o).atob(a[1])}catch(n){}if(!e)return void n.data("wp-ui-svg-"+t,"none");e=(e=(e=e.replace(/fill="(.+?)"/g,'fill="'+t+'"')).replace(/style="(.+?)"/g,'style="fill:'+t+'"')).replace(/fill:.*?;/g,"fill: "+t+";"),e=("btoa"in i?i:o).btoa(e),n.data("wp-ui-svg-"+t,e)}n.attr("style",'background-image: url("data:image/svg+xml;base64,'+e+'") !important;')}}}}(jQuery,window,document);
\ No newline at end of file
+window.wp=window.wp||{},wp.svgPainter=function(a,i){"use strict";var n,t,s={},o=[];return a(function(){wp.svgPainter.init()}),{init:function(){t=this,n=a("#adminmenu .wp-menu-image, #wpadminbar .ab-item"),t.setColors(),t.findElements(),t.paint()},setColors:function(n){(n=void 0===n&&void 0!==i._wpColorScheme?i._wpColorScheme:n)&&n.icons&&n.icons.base&&n.icons.current&&n.icons.focus&&(s=n.icons)},findElements:function(){n.each(function(){var n=a(this),e=n.css("background-image");e&&-1!=e.indexOf("data:image/svg+xml;base64")&&o.push(n)})},paint:function(){a.each(o,function(n,e){var a=e.parent().parent();a.hasClass("current")||a.hasClass("wp-has-current-submenu")?t.paintElement(e,"current"):(t.paintElement(e,"base"),a.on("mouseenter",function(){t.paintElement(e,"focus")}).on("mouseleave",function(){i.setTimeout(function(){t.paintElement(e,"base")},100)}))})},paintElement:function(n,e){var a,t;if(e&&s.hasOwnProperty(e)&&(e=s[e]).match(/^(#[0-9a-f]{3}|#[0-9a-f]{6})$/i)&&"none"!==(a=n.data("wp-ui-svg-"+e))){if(!a){if(!(t=n.css("background-image").match(/.+data:image\/svg\+xml;base64,([A-Za-z0-9\+\/\=]+)/))||!t[1])return void n.data("wp-ui-svg-"+e,"none");try{a=i.atob(t[1])}catch(n){}if(!a)return void n.data("wp-ui-svg-"+e,"none");a=(a=(a=a.replace(/fill="(.+?)"/g,'fill="'+e+'"')).replace(/style="(.+?)"/g,'style="fill:'+e+'"')).replace(/fill:.*?;/g,"fill: "+e+";"),a=i.btoa(a),n.data("wp-ui-svg-"+e,a)}n.attr("style",'background-image: url("data:image/svg+xml;base64,'+a+'") !important;')}}}}(jQuery,window,document);
\ No newline at end of file
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 6b9fe875c4..05975adac3 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58996';
+$wp_version = '6.7-alpha-58997';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.