diff --git a/src/wp-content/themes/twentynineteen/package-lock.json b/src/wp-content/themes/twentynineteen/package-lock.json
index 616dcc79f6dae..e573413168e38 100644
--- a/src/wp-content/themes/twentynineteen/package-lock.json
+++ b/src/wp-content/themes/twentynineteen/package-lock.json
@@ -311,13 +311,16 @@
       "dev": true
     },
     "node_modules/baseline-browser-mapping": {
-      "version": "2.8.25",
-      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.8.25.tgz",
-      "integrity": "sha512-2NovHVesVF5TXefsGX1yzx1xgr7+m9JQenvz6FQY3qd+YXkKkYiv+vTCc7OriP9mcDZpTC5mAOYN4ocd29+erA==",
+      "version": "2.10.35",
+      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.10.35.tgz",
+      "integrity": "sha512-honAfLBde0HAFLdNyBEfuuENkF6zR+ozxqxa/2zJKHBe1qzLqyTSeRKpdPEHAP03rlDGyQOPnCSxnVpVqQo9Mg==",
       "dev": true,
       "license": "Apache-2.0",
       "bin": {
-        "baseline-browser-mapping": "dist/cli.js"
+        "baseline-browser-mapping": "dist/cli.cjs"
+      },
+      "engines": {
+        "node": ">=6.0.0"
       }
     },
     "node_modules/binary-extensions": {
@@ -483,9 +486,9 @@
       }
     },
     "node_modules/caniuse-lite": {
-      "version": "1.0.30001754",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001754.tgz",
-      "integrity": "sha512-x6OeBXueoAceOmotzx3PO4Zpt4rzpeIFsSr6AAePTZxSkXiYDUmpypEl7e2+8NCd9bD7bXjqyef8CJYPC1jfxg==",
+      "version": "1.0.30001799",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001799.tgz",
+      "integrity": "sha512-hG1bReV+OUU+MOqK4t/ZWI0tZOyz3rqS9XuhOUz1cIcbwBKjOyJEJuw9ER5JuNyqxNk8u/JUVbGibBOL1yrjFw==",
       "dev": true,
       "funding": [
         {
@@ -4118,9 +4121,9 @@
       "dev": true
     },
     "baseline-browser-mapping": {
-      "version": "2.8.25",
-      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.8.25.tgz",
-      "integrity": "sha512-2NovHVesVF5TXefsGX1yzx1xgr7+m9JQenvz6FQY3qd+YXkKkYiv+vTCc7OriP9mcDZpTC5mAOYN4ocd29+erA==",
+      "version": "2.10.35",
+      "resolved": "https://registry.npmjs.org/baseline-browser-mapping/-/baseline-browser-mapping-2.10.35.tgz",
+      "integrity": "sha512-honAfLBde0HAFLdNyBEfuuENkF6zR+ozxqxa/2zJKHBe1qzLqyTSeRKpdPEHAP03rlDGyQOPnCSxnVpVqQo9Mg==",
       "dev": true
     },
     "binary-extensions": {
@@ -4238,9 +4241,9 @@
       }
     },
     "caniuse-lite": {
-      "version": "1.0.30001754",
-      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001754.tgz",
-      "integrity": "sha512-x6OeBXueoAceOmotzx3PO4Zpt4rzpeIFsSr6AAePTZxSkXiYDUmpypEl7e2+8NCd9bD7bXjqyef8CJYPC1jfxg==",
+      "version": "1.0.30001799",
+      "resolved": "https://registry.npmjs.org/caniuse-lite/-/caniuse-lite-1.0.30001799.tgz",
+      "integrity": "sha512-hG1bReV+OUU+MOqK4t/ZWI0tZOyz3rqS9XuhOUz1cIcbwBKjOyJEJuw9ER5JuNyqxNk8u/JUVbGibBOL1yrjFw==",
       "dev": true
     },
     "chalk": {
diff --git a/src/wp-content/themes/twentynineteen/postcss.config.js b/src/wp-content/themes/twentynineteen/postcss.config.js
index ff4a27544dc88..93fdeffe44d2f 100644
--- a/src/wp-content/themes/twentynineteen/postcss.config.js
+++ b/src/wp-content/themes/twentynineteen/postcss.config.js
@@ -1,15 +1,11 @@
 var postcssFocusWithin = require('postcss-focus-within');
-
-module.exports = {
-    plugins: {
-        autoprefixer: {}
-    }
-};
+var autoprefixer = require('autoprefixer');
 
 module.exports = {
     plugins: [
         postcssFocusWithin({
             disablePolyfillReadyClass: true
-        })
+        }),
+        autoprefixer()
     ]
 };
diff --git a/src/wp-content/themes/twentynineteen/sass/site/header/_site-featured-image.scss b/src/wp-content/themes/twentynineteen/sass/site/header/_site-featured-image.scss
index b46df6311d1f2..68aeb904cf036 100644
--- a/src/wp-content/themes/twentynineteen/sass/site/header/_site-featured-image.scss
+++ b/src/wp-content/themes/twentynineteen/sass/site/header/_site-featured-image.scss
@@ -60,9 +60,7 @@
 
 	.social-navigation svg,
 	.site-featured-image svg {
-		/* Use -webkit- only if supporting: Chrome < 54, iOS < 9.3, Android < 4.4.4 */
-		-webkit-filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.35) );
-				filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.35) );
+		filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.35) );
 	}
 
 	/* Entry header */
diff --git a/src/wp-content/themes/twentynineteen/style-editor.css b/src/wp-content/themes/twentynineteen/style-editor.css
index 3f4c8bd298a38..cd3ad211bb680 100644
--- a/src/wp-content/themes/twentynineteen/style-editor.css
+++ b/src/wp-content/themes/twentynineteen/style-editor.css
@@ -1482,7 +1482,6 @@ ul.wp-block-archives li ul,
   padding: 0.5rem;
   text-align: left;
   text-align: center;
-  -webkit-margin-start: 0;
   margin-inline-start: 0;
 }
 
diff --git a/src/wp-content/themes/twentynineteen/style-rtl.css b/src/wp-content/themes/twentynineteen/style-rtl.css
index 719f0f52fc7ad..7fa379ed02370 100644
--- a/src/wp-content/themes/twentynineteen/style-rtl.css
+++ b/src/wp-content/themes/twentynineteen/style-rtl.css
@@ -1955,7 +1955,8 @@ abbr[title] {
   /* 1 */
   text-decoration: underline;
   /* 2 */
-  text-decoration: underline dotted;
+  -webkit-text-decoration: underline dotted;
+          text-decoration: underline dotted;
   /* 2 */
 }
 
@@ -2396,9 +2397,6 @@ h6 {
 .error-404 .page-title,
 .comments-title,
 blockquote {
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   word-break: break-word;
   word-wrap: break-word;
@@ -2407,9 +2405,6 @@ blockquote {
 /* Do not hyphenate entry title on tablet view and bigger. */
 @media only screen and (min-width: 768px) {
   .entry-title {
-    -webkit-hyphens: none;
-    -moz-hyphens: none;
-    -ms-hyphens: none;
     hyphens: none;
   }
 }
@@ -2480,10 +2475,6 @@ html {
   box-sizing: border-box;
 }
 
-::-moz-selection {
-  background-color: #bfdcea;
-}
-
 ::selection {
   background-color: #bfdcea;
 }
@@ -2920,8 +2911,6 @@ body.page .main-navigation {
 @media only screen and (min-width: 768px) {
   .main-navigation .sub-menu {
     width: auto;
-    min-width: -moz-max-content;
-    min-width: -webkit-max-content;
     min-width: max-content;
   }
 }
@@ -3036,8 +3025,6 @@ body.page .main-navigation {
     top: auto;
     bottom: auto;
     height: auto;
-    min-width: -moz-max-content;
-    min-width: -webkit-max-content;
     min-width: max-content;
     transform: none;
   }
@@ -3051,8 +3038,6 @@ body.page .main-navigation {
     top: auto;
     bottom: auto;
     height: auto;
-    min-width: -moz-max-content;
-    min-width: -webkit-max-content;
     min-width: max-content;
     transform: none;
   }
@@ -3175,8 +3160,6 @@ body.page .main-navigation {
     top: auto;
     bottom: auto;
     height: auto;
-    min-width: -moz-max-content;
-    min-width: -webkit-max-content;
     min-width: max-content;
     transform: none;
   }
@@ -3467,7 +3450,8 @@ body.page .main-navigation {
 
 .post-navigation .nav-links a .meta-nav {
   color: #767676;
-  user-select: none;
+  -webkit-user-select: none;
+          user-select: none;
 }
 
 .post-navigation .nav-links a .meta-nav:before, .post-navigation .nav-links a .meta-nav:after {
@@ -3756,9 +3740,6 @@ body.page .main-navigation {
 
 .site-branding {
   color: #767676;
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   position: relative;
   word-wrap: break-word;
@@ -3957,8 +3938,6 @@ body.page .main-navigation {
 
 .site-header.featured-image .social-navigation svg,
 .site-header.featured-image .site-featured-image svg {
-  /* Use -webkit- only if supporting: Chrome < 54, iOS < 9.3, Android < 4.4.4 */
-  -webkit-filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.35));
   filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.35));
 }
 
@@ -4157,10 +4136,6 @@ body.page .main-navigation {
   }
 }
 
-.site-header.featured-image ::-moz-selection {
-  background: rgba(255, 255, 255, 0.17);
-}
-
 .site-header.featured-image ::selection {
   background: rgba(255, 255, 255, 0.17);
 }
@@ -4557,9 +4532,6 @@ body.page .main-navigation {
 }
 
 .comments-area {
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   margin: calc(2 * 1rem) 1rem;
   word-wrap: break-word;
@@ -5088,9 +5060,6 @@ body.page .main-navigation {
 }
 
 #colophon .widget-column .widget {
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   width: 100%;
   word-wrap: break-word;
@@ -5105,9 +5074,6 @@ body.page .main-navigation {
 
 #colophon .site-info {
   color: #767676;
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   word-wrap: break-word;
 }
diff --git a/src/wp-content/themes/twentynineteen/style.css b/src/wp-content/themes/twentynineteen/style.css
index 22c57138ee73f..07abd805b7718 100644
--- a/src/wp-content/themes/twentynineteen/style.css
+++ b/src/wp-content/themes/twentynineteen/style.css
@@ -1955,7 +1955,8 @@ abbr[title] {
   /* 1 */
   text-decoration: underline;
   /* 2 */
-  text-decoration: underline dotted;
+  -webkit-text-decoration: underline dotted;
+          text-decoration: underline dotted;
   /* 2 */
 }
 
@@ -2396,9 +2397,6 @@ h6 {
 .error-404 .page-title,
 .comments-title,
 blockquote {
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   word-break: break-word;
   word-wrap: break-word;
@@ -2407,9 +2405,6 @@ blockquote {
 /* Do not hyphenate entry title on tablet view and bigger. */
 @media only screen and (min-width: 768px) {
   .entry-title {
-    -webkit-hyphens: none;
-    -moz-hyphens: none;
-    -ms-hyphens: none;
     hyphens: none;
   }
 }
@@ -2480,10 +2475,6 @@ html {
   box-sizing: border-box;
 }
 
-::-moz-selection {
-  background-color: #bfdcea;
-}
-
 ::selection {
   background-color: #bfdcea;
 }
@@ -2920,8 +2911,6 @@ body.page .main-navigation {
 @media only screen and (min-width: 768px) {
   .main-navigation .sub-menu {
     width: auto;
-    min-width: -moz-max-content;
-    min-width: -webkit-max-content;
     min-width: max-content;
   }
 }
@@ -3036,8 +3025,6 @@ body.page .main-navigation {
     top: auto;
     bottom: auto;
     height: auto;
-    min-width: -moz-max-content;
-    min-width: -webkit-max-content;
     min-width: max-content;
     transform: none;
   }
@@ -3051,8 +3038,6 @@ body.page .main-navigation {
     top: auto;
     bottom: auto;
     height: auto;
-    min-width: -moz-max-content;
-    min-width: -webkit-max-content;
     min-width: max-content;
     transform: none;
   }
@@ -3175,8 +3160,6 @@ body.page .main-navigation {
     top: auto;
     bottom: auto;
     height: auto;
-    min-width: -moz-max-content;
-    min-width: -webkit-max-content;
     min-width: max-content;
     transform: none;
   }
@@ -3467,7 +3450,8 @@ body.page .main-navigation {
 
 .post-navigation .nav-links a .meta-nav {
   color: #767676;
-  user-select: none;
+  -webkit-user-select: none;
+          user-select: none;
 }
 
 .post-navigation .nav-links a .meta-nav:before, .post-navigation .nav-links a .meta-nav:after {
@@ -3762,9 +3746,6 @@ body.page .main-navigation {
 
 .site-branding {
   color: #767676;
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   position: relative;
   word-wrap: break-word;
@@ -3963,8 +3944,6 @@ body.page .main-navigation {
 
 .site-header.featured-image .social-navigation svg,
 .site-header.featured-image .site-featured-image svg {
-  /* Use -webkit- only if supporting: Chrome < 54, iOS < 9.3, Android < 4.4.4 */
-  -webkit-filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.35));
   filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.35));
 }
 
@@ -4163,10 +4142,6 @@ body.page .main-navigation {
   }
 }
 
-.site-header.featured-image ::-moz-selection {
-  background: rgba(255, 255, 255, 0.17);
-}
-
 .site-header.featured-image ::selection {
   background: rgba(255, 255, 255, 0.17);
 }
@@ -4563,9 +4538,6 @@ body.page .main-navigation {
 }
 
 .comments-area {
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   margin: calc(2 * 1rem) 1rem;
   word-wrap: break-word;
@@ -5094,9 +5066,6 @@ body.page .main-navigation {
 }
 
 #colophon .widget-column .widget {
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   width: 100%;
   word-wrap: break-word;
@@ -5111,9 +5080,6 @@ body.page .main-navigation {
 
 #colophon .site-info {
   color: #767676;
-  -webkit-hyphens: auto;
-  -moz-hyphens: auto;
-  -ms-hyphens: auto;
   hyphens: auto;
   word-wrap: break-word;
 }