diff --git a/core/.stylelintrc.json b/core/.stylelintrc.json
index 322fad0..c0ebfe1 100644
--- a/core/.stylelintrc.json
+++ b/core/.stylelintrc.json
@@ -21,7 +21,6 @@
     "length-zero-no-unit": null,
     "no-empty-source": null,
     "no-unknown-animations": true,
-    "number-leading-zero": null,
     "number-no-trailing-zeros": null,
     "plugin/no-browser-hacks": [true, {
       "browsers": [
diff --git a/core/modules/ckeditor/css/ckeditor.admin.css b/core/modules/ckeditor/css/ckeditor.admin.css
index cfbeae0..8d4560d 100644
--- a/core/modules/ckeditor/css/ckeditor.admin.css
+++ b/core/modules/ckeditor/css/ckeditor.admin.css
@@ -180,7 +180,7 @@
   padding: 4px 6px;
   position: relative;
   text-decoration: none;
-  text-shadow: 0 1px 0 rgba(255,255,255,.5);
+  text-shadow: 0 1px 0 rgba(255,255,255,0.5);
   white-space: nowrap;
 }
 .ckeditor-toolbar-dividers {
diff --git a/core/modules/dblog/css/dblog.module.css b/core/modules/dblog/css/dblog.module.css
index e844e14..1346206 100644
--- a/core/modules/dblog/css/dblog.module.css
+++ b/core/modules/dblog/css/dblog.module.css
@@ -5,12 +5,12 @@
 .dblog-filter-form .form-item-type,
 .dblog-filter-form .form-item-severity {
   display: inline-block;
-  margin: .1em .9em .1em .1em; /* LTR */
+  margin: 0.1em 0.9em 0.1em 0.1em; /* LTR */
   max-width: 30%;
 }
 [dir="rtl"] .dblog-filter-form .form-item-type,
 [dir="rtl"] .dblog-filter-form .form-item-severity {
-  margin: .1em .1em .1em .9em;
+  margin: 0.1em 0.1em 0.1em 0.9em;
 }
 .dblog-filter-form .form-actions {
   display: inline-block;
diff --git a/core/modules/field_ui/css/field_ui.admin.css b/core/modules/field_ui/css/field_ui.admin.css
index 08f6c2d..f171649 100644
--- a/core/modules/field_ui/css/field_ui.admin.css
+++ b/core/modules/field_ui/css/field_ui.admin.css
@@ -17,7 +17,7 @@
 }
 .field-ui-overview .field-plugin-summary {
   float: left; /* LTR */
-  font-size: .9em;
+  font-size: 0.9em;
 }
 [dir="rtl"] .field-ui-overview .field-plugin-summary {
   float: right;
@@ -25,7 +25,7 @@
 .field-ui-overview .field-plugin-summary-cell .warning {
   display: block;
   float: left; /* LTR */
-  margin-right: .5em;
+  margin-right: 0.5em;
 }
 [dir="rtl"] .field-ui-overview .field-plugin-summary-cell .warning {
   float: right;
diff --git a/core/modules/image/css/editors/image.theme.css b/core/modules/image/css/editors/image.theme.css
index 5946458..2bd1435 100644
--- a/core/modules/image/css/editors/image.theme.css
+++ b/core/modules/image/css/editors/image.theme.css
@@ -5,12 +5,12 @@
 
 .quickedit-image-dropzone {
   background: rgba(116, 183, 255, 0.8);
-  transition: background .2s;
+  transition: background 0.2s;
 }
 
 .quickedit-image-icon {
   margin: 0 0 10px 0;
-  transition: margin .5s;
+  transition: margin 0.5s;
 }
 
 .quickedit-image-dropzone.hover {
diff --git a/core/modules/locale/css/locale.admin.css b/core/modules/locale/css/locale.admin.css
index aa83c8b..a02533a 100644
--- a/core/modules/locale/css/locale.admin.css
+++ b/core/modules/locale/css/locale.admin.css
@@ -74,12 +74,12 @@
   vertical-align: top;
 }
 .locale-translation-update__wrapper {
-  background: transparent url(../../../misc/menu-collapsed.png) left .6em no-repeat;
+  background: transparent url(../../../misc/menu-collapsed.png) left 0.6em no-repeat;
   margin-left: -12px;
   padding-left: 12px;
 }
 .expanded .locale-translation-update__wrapper {
-  background: transparent url(../../../misc/menu-expanded.png) left .6em no-repeat;
+  background: transparent url(../../../misc/menu-expanded.png) left 0.6em no-repeat;
 }
 #locale-translation-status-form .description {
   cursor: pointer;
diff --git a/core/modules/outside_in/css/off-canvas.motion.css b/core/modules/outside_in/css/off-canvas.motion.css
index e395fbb..5675f9f 100644
--- a/core/modules/outside_in/css/off-canvas.motion.css
+++ b/core/modules/outside_in/css/off-canvas.motion.css
@@ -12,21 +12,21 @@
 
 /* Transition the off-canvas dialog container, with 2s delay to match main canvas speed. */
 .ui-dialog-off-canvas .ui-dialog-content {
-  -webkit-transition: all .7s ease 2s;
-  -moz-transition: all .7s ease 2s;
-  transition: all .7s ease 2s;
+  -webkit-transition: all 0.7s ease 2s;
+  -moz-transition: all 0.7s ease 2s;
+  transition: all 0.7s ease 2s;
 }
 
 @media (max-width: 700px) {
   .ui-dialog-off-canvas .ui-dialog-content {
-    -webkit-transition: all .7s ease;
-    -moz-transition: all .7s ease;
-    transition: all .7s ease;
+    -webkit-transition: all 0.7s ease;
+    -moz-transition: all 0.7s ease;
+    transition: all 0.7s ease;
   }
 }
 
 .dialog-off-canvas__main-canvas {
-  -webkit-transition: all .7s ease;
-  -moz-transition: all .7s ease;
-  transition: all .7s ease;
+  -webkit-transition: all 0.7s ease;
+  -moz-transition: all 0.7s ease;
+  transition: all 0.7s ease;
 }
diff --git a/core/modules/outside_in/css/outside_in.details.css b/core/modules/outside_in/css/outside_in.details.css
index 8ca1406..e04bff2 100644
--- a/core/modules/outside_in/css/outside_in.details.css
+++ b/core/modules/outside_in/css/outside_in.details.css
@@ -31,7 +31,7 @@
   outline: none;
   padding: 10px 20px;
   font-size: 14px;
-  transition: all .5s ease;
+  transition: all 0.5s ease;
 }
 .ui-dialog-outside-in summary:hover,
 .ui-dialog-outside-in summary:focus {
diff --git a/core/modules/outside_in/css/outside_in.form.css b/core/modules/outside_in/css/outside_in.form.css
index 5d4c3be..fa11033 100644
--- a/core/modules/outside_in/css/outside_in.form.css
+++ b/core/modules/outside_in/css/outside_in.form.css
@@ -64,7 +64,7 @@
 .ui-dialog-outside-in .form-textarea,
 .ui-dialog-outside-in .form-date,
 .ui-dialog-outside-in .form-time {
-  box-shadow: inset 0 1px 2px rgba(0, 0, 0, .125);
+  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.125);
   background-color: #eee;
   border-color: #333;
   color: #595959;
@@ -81,7 +81,7 @@
 .ui-dialog-outside-in .form-date:focus,
 .ui-dialog-outside-in .form-time:focus {
   border-color: #40b6ff;
-  box-shadow: inset 0 1px 3px rgba(0, 0, 0, .125), 0 0 8px #40b6ff;
+  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.125), 0 0 8px #40b6ff;
   background-color: #fff;
 }
 .ui-dialog-outside-in input[type="checkbox"],
diff --git a/core/modules/outside_in/css/outside_in.motion.css b/core/modules/outside_in/css/outside_in.motion.css
index 5fae723..4a8c6fc 100644
--- a/core/modules/outside_in/css/outside_in.motion.css
+++ b/core/modules/outside_in/css/outside_in.motion.css
@@ -12,33 +12,33 @@
 
 /* Transition the edit icon in the toolbar. */
 #toolbar-bar.button.toolbar-icon.toolbar-icon.toolbar-icon-edit:before {
-  -webkit-transition: all .7s ease;
-  -moz-transition: all .7s ease;
-  transition: all .7s ease;
+  -webkit-transition: all 0.7s ease;
+  -moz-transition: all 0.7s ease;
+  transition: all 0.7s ease;
 }
 
 /* Transition the editables on the page, their contextual links and their hover states. */
 .dialog-off-canvas__main-canvas .contextual,
 .dialog-off-canvas__main-canvas .js-outside-in-edit-mode .outside-in-editable,
 .dialog-off-canvas__main-canvas.js-tray-open .js-outside-in-edit-mode .outside-in-editable {
-  -webkit-transition: all .7s ease;
-  -moz-transition: all .7s ease;
-  transition: all .7s ease;
+  -webkit-transition: all 0.7s ease;
+  -moz-transition: all 0.7s ease;
+  transition: all 0.7s ease;
 }
 
 /* Transition the position of the toolbar. */
 .toolbar-fixed,
 .toolbar-tray-open {
-  -webkit-transition: all .5s ease;
-  -moz-transition: all .5s ease;
-  transition: all .5s ease;
+  -webkit-transition: all 0.5s ease;
+  -moz-transition: all 0.5s ease;
+  transition: all 0.5s ease;
 }
 
 /* Transition the administration tray.
 #toolbar-administration,
 #toolbar-administration * {
-  -webkit-transition: all .7s ease;
-  -moz-transition: all .7s ease;
-  transition: all .7s ease;
+  -webkit-transition: all 0.7s ease;
+  -moz-transition: all 0.7s ease;
+  transition: all 0.7s ease;
 }
 */
diff --git a/core/modules/outside_in/css/outside_in.theme.css b/core/modules/outside_in/css/outside_in.theme.css
index 0db7a3c..a527fd6 100644
--- a/core/modules/outside_in/css/outside_in.theme.css
+++ b/core/modules/outside_in/css/outside_in.theme.css
@@ -111,7 +111,7 @@
   font-weight: normal;
   color: #85bef4;
   text-decoration: none;
-  transition: color .5s ease;
+  transition: color 0.5s ease;
 }
 .ui-dialog-outside-in a:focus,
 .ui-dialog-outside-in .link:focus,
@@ -139,8 +139,8 @@
   border: 0;
   position: absolute;
   right: 20px;
-  -moz-transition: all .5s ease;
-  transition: background .5s ease;
+  -moz-transition: all 0.5s ease;
+  transition: background 0.5s ease;
 }
 .ui-dialog-outside-in .ui-dialog-titlebar-close:hover {
   background-image: url(../../../misc/icons/ffffff/ex.svg);
@@ -218,7 +218,7 @@
   border-radius: 1em;
   font-size: 14px;
   color: #fff;
-  transition: all .5s ease;
+  transition: all 0.5s ease;
 }
 .ui-dialog-outside-in .button:hover,
 .ui-dialog-outside-in .button:focus {
@@ -228,7 +228,7 @@
   background: #277abd none;
   border: none;
   color: #fff;
-  transition: all .5s ease;
+  transition: all 0.5s ease;
 }
 .ui-dialog-outside-in .button--primary:hover,
 .ui-dialog-outside-in .button--primary:focus {
@@ -246,7 +246,7 @@
   border: 0;
   border-radius: 1em;
   color: #eee;
-  transition: background .5s ease;
+  transition: background 0.5s ease;
 }
 .ui-dialog-outside-in .dropbutton-widget:hover {
   box-shadow: 0 2px 2px 1px rgba(0,0,0,0.5);
@@ -258,7 +258,7 @@
   border-style: solid;
   border-color: #333;
   border-left-width: 1px; /* LTR */
-  transition: background .5s ease;
+  transition: background 0.5s ease;
 }
 [dir="rtl"] .ui-dialog-outside-in .dropbutton-toggle button {
   border-radius: 0;
@@ -284,7 +284,7 @@
   color: #eee;
   font-size: 90%;
   line-height: 1.8;
-  transition: all .5s ease;
+  transition: all 0.5s ease;
 }
 .ui-dialog-outside-in .dropbutton:hover a {
   color: #fff;
diff --git a/core/modules/quickedit/css/quickedit.icons.theme.css b/core/modules/quickedit/css/quickedit.icons.theme.css
index 7845416..fc5b31f 100644
--- a/core/modules/quickedit/css/quickedit.icons.theme.css
+++ b/core/modules/quickedit/css/quickedit.icons.theme.css
@@ -48,7 +48,7 @@
   font-size: 1em;
 }
 .quickedit .icon-pencil {
-  margin-left: .5em;
+  margin-left: 0.5em;
   padding-left: 1.5em;
 }
 
diff --git a/core/modules/quickedit/css/quickedit.theme.css b/core/modules/quickedit/css/quickedit.theme.css
index 120573a..303660f 100644
--- a/core/modules/quickedit/css/quickedit.theme.css
+++ b/core/modules/quickedit/css/quickedit.theme.css
@@ -45,7 +45,7 @@
   margin: 0;
 }
 .quickedit-form .form-wrapper {
-  margin: .5em;
+  margin: 0.5em;
 }
 
 /**
@@ -55,35 +55,35 @@
   opacity: 0;
 }
 .quickedit-animate-default {
-  -webkit-transition: all .4s ease;
-  transition: all .4s ease;
+  -webkit-transition: all 0.4s ease;
+  transition: all 0.4s ease;
 }
 .quickedit-animate-slow {
-  -webkit-transition: all .6s ease;
-  transition: all .6s ease;
+  -webkit-transition: all 0.6s ease;
+  transition: all 0.6s ease;
 }
 .quickedit-animate-delay-veryfast {
-  -webkit-transition-delay: .05s;
-  transition-delay: .05s;
+  -webkit-transition-delay: 0.05s;
+  transition-delay: 0.05s;
 }
 .quickedit-animate-delay-fast {
-  -webkit-transition-delay: .2s;
-  transition-delay: .2s;
+  -webkit-transition-delay: 0.2s;
+  transition-delay: 0.2s;
 }
 .quickedit-animate-disable-width {
   -webkit-transition: width 0s;
   transition: width 0s;
 }
 .quickedit-animate-only-visibility {
-  -webkit-transition: opacity .2s ease;
-  transition: opacity .2s ease;
+  -webkit-transition: opacity 0.2s ease;
+  transition: opacity 0.2s ease;
 }
 
 /**
  * In-place editors that don't use a popup.
  */
 .quickedit-validation-errors .messages.error {
-  box-shadow: 0 0 1px 1px red, 0 0 3px 3px rgba(153, 153, 153, .5);
+  box-shadow: 0 0 1px 1px red, 0 0 3px 3px rgba(153, 153, 153, 0.5);
   background-color: white;
 }
 
@@ -208,8 +208,8 @@
   margin: 0;
   opacity: 1;
   padding: 0.345em;
-  -webkit-transition: opacity .1s ease;
-  transition: opacity .1s ease;
+  -webkit-transition: opacity 0.1s ease;
+  transition: opacity 0.1s ease;
 }
 .quickedit-button[aria-hidden="true"] {
   visibility: hidden;
diff --git a/core/modules/system/css/components/progress.module.css b/core/modules/system/css/components/progress.module.css
index 574c693..566fa86 100644
--- a/core/modules/system/css/components/progress.module.css
+++ b/core/modules/system/css/components/progress.module.css
@@ -27,7 +27,7 @@
 .progress__percentage {
   color: #555;
   overflow: hidden;
-  font-size: .875em;
+  font-size: 0.875em;
   margin-top: 0.2em;
 }
 .progress__description {
diff --git a/core/modules/system/css/components/system-status-report-counters.css b/core/modules/system/css/components/system-status-report-counters.css
index 1a4e240..2a2ef6b 100644
--- a/core/modules/system/css/components/system-status-report-counters.css
+++ b/core/modules/system/css/components/system-status-report-counters.css
@@ -5,11 +5,11 @@
 
 .system-status-report-counters__item {
   width: 100%;
-  padding: .5em 0;
+  padding: 0.5em 0;
   text-align: center;
   white-space: nowrap;
   background-color: rgba(0, 0, 0, 0.063);
-  margin-bottom: .5em;
+  margin-bottom: 0.5em;
 }
 
 @media screen and (min-width: 60em) {
diff --git a/core/modules/system/css/system.admin.css b/core/modules/system/css/system.admin.css
index be739ac..baee5a5 100644
--- a/core/modules/system/css/system.admin.css
+++ b/core/modules/system/css/system.admin.css
@@ -234,7 +234,7 @@ small .admin-link:after {
   background-image: url(../../../misc/icons/e29700/warning.svg);
 }
 .system-status-report__entry__value {
-  padding: 1em .5em;
+  padding: 1em 0.5em;
 }
 
 /**
diff --git a/core/modules/user/css/user.admin.css b/core/modules/user/css/user.admin.css
index 10358c2..21ed153 100644
--- a/core/modules/user/css/user.admin.css
+++ b/core/modules/user/css/user.admin.css
@@ -18,5 +18,5 @@
 /* Account settings */
 .user-admin-settings .details-description {
   font-size: 0.85em;
-  padding-bottom: .5em;
+  padding-bottom: 0.5em;
 }
diff --git a/core/themes/bartik/css/components/node-preview.css b/core/themes/bartik/css/components/node-preview.css
index 520141a..a683c3c 100644
--- a/core/themes/bartik/css/components/node-preview.css
+++ b/core/themes/bartik/css/components/node-preview.css
@@ -14,8 +14,8 @@
   background: url(../../../../misc/icons/000000/chevron-left.svg) left no-repeat, -webkit-linear-gradient(top, #419ff1, #1076d5);
   background: url(../../../../misc/icons/000000/chevron-left.svg) left no-repeat, linear-gradient(to bottom, #419ff1, #1076d5); /* LTR */
   border: 1px solid #0048c8;
-  border-radius: .4em;
-  box-shadow: inset 0 1px 0 rgba(255, 255, 255, .4);
+  border-radius: 0.4em;
+  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.4);
   color: #fff;
   font-size: 0.9em;
   line-height: normal;
@@ -48,7 +48,7 @@
   background: url(../../../../misc/icons/000000/chevron-left.svg) left no-repeat, -webkit-linear-gradient(top, #0e69be, #2a93ef);
   background: url(../../../../misc/icons/000000/chevron-left.svg) left no-repeat, linear-gradient(to bottom, #0e69be, #2a93ef); /* LTR */
   border: 1px solid #0048c8;
-  box-shadow: inset 0 1px 2px rgba(0, 0, 0, .25);
+  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.25);
 }
 [dir="rtl"] .node-preview-backlink:active {
   background: url(../../../../misc/icons/000000/chevron-right.svg) right no-repeat, -webkit-linear-gradient(top, #0e69be, #2a93ef);
diff --git a/core/themes/classy/css/components/dialog.css b/core/themes/classy/css/components/dialog.css
index 1793108..bc9e335 100644
--- a/core/themes/classy/css/components/dialog.css
+++ b/core/themes/classy/css/components/dialog.css
@@ -32,7 +32,7 @@
 .ui-dialog .ui-dialog-buttonpane {
   margin-top: 0;
   background: #f3f4ee;
-  padding: .3em 1em;
+  padding: 0.3em 1em;
   border-width: 1px 0 0 0;
   border-color: #ccc;
 }
diff --git a/core/themes/classy/css/components/form.css b/core/themes/classy/css/components/form.css
index 97b94fe..7529a47 100644
--- a/core/themes/classy/css/components/form.css
+++ b/core/themes/classy/css/components/form.css
@@ -14,14 +14,14 @@ form .field-multiple-table .field-multiple-drag {
   padding-left: 0;
 }
 form .field-multiple-table .field-multiple-drag .tabledrag-handle {
-  padding-right: .5em; /* LTR */
+  padding-right: 0.5em; /* LTR */
 }
 [dir="rtl"] form .field-multiple-table .field-multiple-drag .tabledrag-handle {
   padding-right: 0;
-  padding-left: .5em;
+  padding-left: 0.5em;
 }
 form .field-add-more-submit {
-  margin: .5em 0 0;
+  margin: 0.5em 0 0;
 }
 
 /**
diff --git a/core/themes/seven/css/base/elements.css b/core/themes/seven/css/base/elements.css
index 6644cea..3362d53 100644
--- a/core/themes/seven/css/base/elements.css
+++ b/core/themes/seven/css/base/elements.css
@@ -152,7 +152,7 @@ ol {
 }
 quote,
 code {
-  margin: .5em 0;
+  margin: 0.5em 0;
 }
 pre {
   margin: 0.5em 0;
diff --git a/core/themes/seven/css/components/form.css b/core/themes/seven/css/components/form.css
index 0db30e8..eca1e66 100644
--- a/core/themes/seven/css/components/form.css
+++ b/core/themes/seven/css/components/form.css
@@ -84,7 +84,7 @@ label[for] {
 .form-disabled textarea.form-textarea,
 .form-disabled select.form-select {
   border-color: #d4d4d4;
-  background-color: hsla(0, 0%, 0%, .08);
+  background-color: hsla(0, 0%, 0%, 0.08);
   box-shadow: none;
 }
 .form-item input.error,
@@ -105,7 +105,7 @@ label[for] {
 .form-item select.error:focus {
   border-color: #e62600;
   outline: 0;
-  box-shadow: inset 0 1px 3px rgba(0, 0, 0, .05), 0 0 8px 1px #e62600;
+  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05), 0 0 8px 1px #e62600;
   background-color: #fcf4f2;
 }
 .form-required:after {
@@ -175,7 +175,7 @@ input.form-date,
 input.form-time,
 textarea.form-textarea {
   box-sizing: border-box;
-  padding: .3em .4em .3em .5em; /* LTR */
+  padding: 0.3em 0.4em 0.3em 0.5em; /* LTR */
   max-width: 100%;
   border: 1px solid #b8b8b8;
   border-top-color: #999;
@@ -183,14 +183,14 @@ textarea.form-textarea {
   color: #333;
   border-radius: 2px;
   background: #fcfcfa;
-  box-shadow: inset 0 1px 2px rgba(0, 0, 0, .125);
+  box-shadow: inset 0 1px 2px rgba(0, 0, 0, 0.125);
   font-size: 1em;
   color: #595959;
   -webkit-transition: border linear 0.2s, box-shadow linear 0.2s;
   transition: border linear 0.2s, box-shadow linear 0.2s;
 }
 [dir="rtl"] textarea.form-textarea {
-  padding: .3em .5em .3em .4em;
+  padding: 0.3em 0.5em 0.3em 0.4em;
 }
 .form-text:focus,
 .form-tel:focus,
@@ -205,7 +205,7 @@ textarea.form-textarea {
 .form-time:focus {
   border-color: #40b6ff;
   outline: 0;
-  box-shadow: inset 0 1px 3px rgba(0, 0, 0, .05), 0 0 8px #40b6ff;
+  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05), 0 0 8px #40b6ff;
   background-color: #fff;
 }
 
diff --git a/core/themes/seven/css/components/jquery.ui/theme.css b/core/themes/seven/css/components/jquery.ui/theme.css
index 02dc83d..5b73da8 100644
--- a/core/themes/seven/css/components/jquery.ui/theme.css
+++ b/core/themes/seven/css/components/jquery.ui/theme.css
@@ -44,12 +44,12 @@
 }
 .ui-state-disabled,
 .ui-widget-content .ui-state-disabled {
-  opacity: .35;
+  opacity: 0.35;
   filter: Alpha(Opacity=35);
 }
 .ui-priority-secondary,
 .ui-widget-content .ui-priority-secondary {
-  opacity: .7;
+  opacity: 0.7;
   filter: Alpha(Opacity=70);
 }
 
@@ -333,7 +333,7 @@
  */
 .ui-widget-overlay {
   background: #000;
-  opacity: .70;
+  opacity: 0.70;
   filter: Alpha(Opacity=70);
 }
 
diff --git a/core/themes/seven/css/components/system-status-counter.css b/core/themes/seven/css/components/system-status-counter.css
index 8d71965..5205c91 100644
--- a/core/themes/seven/css/components/system-status-counter.css
+++ b/core/themes/seven/css/components/system-status-counter.css
@@ -21,12 +21,12 @@
   border-right: 1px solid #e6e4df; /* LTR */
   border-left: 0; /* LTR */
   background-color: #faf9f5;
-  box-shadow: 0 1px 1px rgba(0, 0, 0, .1) inset;
+  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1) inset;
 }
 [dir="rtl"] .system-status-counter__status-icon {
   border-right: 0;
   border-left: 1px solid #e6e4df;
-  box-shadow: 0 1px 1px rgba(0, 0, 0, .1) inset;
+  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1) inset;
 }
 .system-status-counter__status-icon:before {
   content: "";
diff --git a/core/themes/stable/css/ckeditor/ckeditor.admin.css b/core/themes/stable/css/ckeditor/ckeditor.admin.css
index cfbeae0..8d4560d 100644
--- a/core/themes/stable/css/ckeditor/ckeditor.admin.css
+++ b/core/themes/stable/css/ckeditor/ckeditor.admin.css
@@ -180,7 +180,7 @@
   padding: 4px 6px;
   position: relative;
   text-decoration: none;
-  text-shadow: 0 1px 0 rgba(255,255,255,.5);
+  text-shadow: 0 1px 0 rgba(255,255,255,0.5);
   white-space: nowrap;
 }
 .ckeditor-toolbar-dividers {
diff --git a/core/themes/stable/css/dblog/dblog.module.css b/core/themes/stable/css/dblog/dblog.module.css
index ed531b7..88cccca 100644
--- a/core/themes/stable/css/dblog/dblog.module.css
+++ b/core/themes/stable/css/dblog/dblog.module.css
@@ -5,12 +5,12 @@
 .dblog-filter-form .form-item-type,
 .dblog-filter-form .form-item-severity {
   display: inline-block;
-  margin: .1em .9em .1em .1em; /* LTR */
+  margin: 0.1em 0.9em 0.1em 0.1em; /* LTR */
   max-width: 30%;
 }
 [dir="rtl"] .dblog-filter-form .form-item-type,
 [dir="rtl"] .dblog-filter-form .form-item-severity {
-  margin: .1em .1em .1em .9em;
+  margin: 0.1em 0.1em 0.1em 0.9em;
 }
 .dblog-filter-form .form-actions {
   display: inline-block;
diff --git a/core/themes/stable/css/field_ui/field_ui.admin.css b/core/themes/stable/css/field_ui/field_ui.admin.css
index 08f6c2d..f171649 100644
--- a/core/themes/stable/css/field_ui/field_ui.admin.css
+++ b/core/themes/stable/css/field_ui/field_ui.admin.css
@@ -17,7 +17,7 @@
 }
 .field-ui-overview .field-plugin-summary {
   float: left; /* LTR */
-  font-size: .9em;
+  font-size: 0.9em;
 }
 [dir="rtl"] .field-ui-overview .field-plugin-summary {
   float: right;
@@ -25,7 +25,7 @@
 .field-ui-overview .field-plugin-summary-cell .warning {
   display: block;
   float: left; /* LTR */
-  margin-right: .5em;
+  margin-right: 0.5em;
 }
 [dir="rtl"] .field-ui-overview .field-plugin-summary-cell .warning {
   float: right;
diff --git a/core/themes/stable/css/image/editors/image.theme.css b/core/themes/stable/css/image/editors/image.theme.css
index f7a1b3a..feaa87f 100644
--- a/core/themes/stable/css/image/editors/image.theme.css
+++ b/core/themes/stable/css/image/editors/image.theme.css
@@ -5,12 +5,12 @@
 
 .quickedit-image-dropzone {
   background: rgba(116, 183, 255, 0.8);
-  transition: background .2s;
+  transition: background 0.2s;
 }
 
 .quickedit-image-icon {
   margin: 0 0 10px 0;
-  transition: margin .5s;
+  transition: margin 0.5s;
 }
 
 .quickedit-image-dropzone.hover {
diff --git a/core/themes/stable/css/locale/locale.admin.css b/core/themes/stable/css/locale/locale.admin.css
index d55b429..935f5ee 100644
--- a/core/themes/stable/css/locale/locale.admin.css
+++ b/core/themes/stable/css/locale/locale.admin.css
@@ -74,12 +74,12 @@
   vertical-align: top;
 }
 .locale-translation-update__wrapper {
-  background: transparent url(../../images/core/menu-collapsed.png) left .6em no-repeat;
+  background: transparent url(../../images/core/menu-collapsed.png) left 0.6em no-repeat;
   margin-left: -12px;
   padding-left: 12px;
 }
 .expanded .locale-translation-update__wrapper {
-  background: transparent url(../../images/core/menu-expanded.png) left .6em no-repeat;
+  background: transparent url(../../images/core/menu-expanded.png) left 0.6em no-repeat;
 }
 #locale-translation-status-form .description {
   cursor: pointer;
diff --git a/core/themes/stable/css/quickedit/quickedit.icons.theme.css b/core/themes/stable/css/quickedit/quickedit.icons.theme.css
index 856a78b..1b2234a 100644
--- a/core/themes/stable/css/quickedit/quickedit.icons.theme.css
+++ b/core/themes/stable/css/quickedit/quickedit.icons.theme.css
@@ -48,7 +48,7 @@
   font-size: 1em;
 }
 .quickedit .icon-pencil {
-  margin-left: .5em;
+  margin-left: 0.5em;
   padding-left: 1.5em;
 }
 
diff --git a/core/themes/stable/css/quickedit/quickedit.theme.css b/core/themes/stable/css/quickedit/quickedit.theme.css
index 120573a..303660f 100644
--- a/core/themes/stable/css/quickedit/quickedit.theme.css
+++ b/core/themes/stable/css/quickedit/quickedit.theme.css
@@ -45,7 +45,7 @@
   margin: 0;
 }
 .quickedit-form .form-wrapper {
-  margin: .5em;
+  margin: 0.5em;
 }
 
 /**
@@ -55,35 +55,35 @@
   opacity: 0;
 }
 .quickedit-animate-default {
-  -webkit-transition: all .4s ease;
-  transition: all .4s ease;
+  -webkit-transition: all 0.4s ease;
+  transition: all 0.4s ease;
 }
 .quickedit-animate-slow {
-  -webkit-transition: all .6s ease;
-  transition: all .6s ease;
+  -webkit-transition: all 0.6s ease;
+  transition: all 0.6s ease;
 }
 .quickedit-animate-delay-veryfast {
-  -webkit-transition-delay: .05s;
-  transition-delay: .05s;
+  -webkit-transition-delay: 0.05s;
+  transition-delay: 0.05s;
 }
 .quickedit-animate-delay-fast {
-  -webkit-transition-delay: .2s;
-  transition-delay: .2s;
+  -webkit-transition-delay: 0.2s;
+  transition-delay: 0.2s;
 }
 .quickedit-animate-disable-width {
   -webkit-transition: width 0s;
   transition: width 0s;
 }
 .quickedit-animate-only-visibility {
-  -webkit-transition: opacity .2s ease;
-  transition: opacity .2s ease;
+  -webkit-transition: opacity 0.2s ease;
+  transition: opacity 0.2s ease;
 }
 
 /**
  * In-place editors that don't use a popup.
  */
 .quickedit-validation-errors .messages.error {
-  box-shadow: 0 0 1px 1px red, 0 0 3px 3px rgba(153, 153, 153, .5);
+  box-shadow: 0 0 1px 1px red, 0 0 3px 3px rgba(153, 153, 153, 0.5);
   background-color: white;
 }
 
@@ -208,8 +208,8 @@
   margin: 0;
   opacity: 1;
   padding: 0.345em;
-  -webkit-transition: opacity .1s ease;
-  transition: opacity .1s ease;
+  -webkit-transition: opacity 0.1s ease;
+  transition: opacity 0.1s ease;
 }
 .quickedit-button[aria-hidden="true"] {
   visibility: hidden;
diff --git a/core/themes/stable/css/system/components/progress.module.css b/core/themes/stable/css/system/components/progress.module.css
index 80042af..3ae22ae 100644
--- a/core/themes/stable/css/system/components/progress.module.css
+++ b/core/themes/stable/css/system/components/progress.module.css
@@ -27,7 +27,7 @@
 .progress__percentage {
   color: #555;
   overflow: hidden;
-  font-size: .875em;
+  font-size: 0.875em;
   margin-top: 0.2em;
 }
 .progress__description {
diff --git a/core/themes/stable/css/system/components/system-status-report-counters.css b/core/themes/stable/css/system/components/system-status-report-counters.css
index 1a4e240..2a2ef6b 100644
--- a/core/themes/stable/css/system/components/system-status-report-counters.css
+++ b/core/themes/stable/css/system/components/system-status-report-counters.css
@@ -5,11 +5,11 @@
 
 .system-status-report-counters__item {
   width: 100%;
-  padding: .5em 0;
+  padding: 0.5em 0;
   text-align: center;
   white-space: nowrap;
   background-color: rgba(0, 0, 0, 0.063);
-  margin-bottom: .5em;
+  margin-bottom: 0.5em;
 }
 
 @media screen and (min-width: 60em) {
diff --git a/core/themes/stable/css/system/system.admin.css b/core/themes/stable/css/system/system.admin.css
index 6f5f62b..6f64bbf 100644
--- a/core/themes/stable/css/system/system.admin.css
+++ b/core/themes/stable/css/system/system.admin.css
@@ -234,7 +234,7 @@ small .admin-link:after {
   background-image: url(../../images/core/icons/e29700/warning.svg);
 }
 .system-status-report__entry__value {
-  padding: 1em .5em;
+  padding: 1em 0.5em;
 }
 
 /**
diff --git a/core/themes/stable/css/user/user.admin.css b/core/themes/stable/css/user/user.admin.css
index 10358c2..21ed153 100644
--- a/core/themes/stable/css/user/user.admin.css
+++ b/core/themes/stable/css/user/user.admin.css
@@ -18,5 +18,5 @@
 /* Account settings */
 .user-admin-settings .details-description {
   font-size: 0.85em;
-  padding-bottom: .5em;
+  padding-bottom: 0.5em;
 }