Styling option should not override option:checked UA style

Source/core/css/html.css

Index: Source/core/css/html.css
diff --git a/Source/core/css/html.css b/Source/core/css/html.css
index b1ad9ac08e36a6200c371329432854a6b2ad9f7e..91f074ae229dbd1db260468988f494bdaef87e3d 100644
--- a/Source/core/css/html.css
+++ b/Source/core/css/html.css
@@ -757,9 +757,7 @@ select {
     cursor: default;
 }
 
-select[size],
-select[multiple],
-select[size][multiple] {
+select:-internal-list-box {
     -webkit-appearance: listbox;
     align-items: flex-start;
     border: 1px inset gray;
@@ -771,21 +769,6 @@ select[size][multiple] {
     white-space: nowrap;
 }
 
-select[size="0"],
-select[size="1"] {
-    -webkit-appearance: menulist;
-    align-items: center;
-    border-width: 1px;
-    border-style: solid;
-    border-color: initial;
-    border-radius: 5px;
-    overflow-x: initial;
-    overflow-y: initial;
-    vertical-align: initial;
-    -webkit-user-select: initial;
-    white-space: pre;
-}
-
 optgroup {
     font-weight: bolder;
     display: block;
@@ -799,38 +782,21 @@ option {
     min-height: 1.2em;
 }
 
-select:focus[size] option:checked,
-select:focus[multiple] option:checked,
-select:focus[size][multiple] option:checked {
-    background-color: -internal-active-list-box-selection;
-    color: -internal-active-list-box-selection-text;
+select:-internal-list-box:focus option:checked {
+    background-color: -internal-active-list-box-selection !important;

[tkent, 2014/08/07 08:08:58]

Does this mean web authors can't specify option:checked style?

+    color: -internal-active-list-box-selection-text !important;
 }
 
-select[size] option:checked,
-select[multiple] option:checked,
-select[size][multiple] option:checked {
-    background-color: -internal-inactive-list-box-selection;
-    color: -internal-inactive-list-box-selection-text;
+select:-internal-list-box option:checked {
+    background-color: -internal-inactive-list-box-selection !important;
+    color: -internal-inactive-list-box-selection-text !important;
 }
 
-select[size="0"] option:checked,
-select[size="1"] option:checked,
-select:focus[size="0"] option:checked,
-select:focus[size="1"] option:checked {
-    background-color: initial;
-    color: initial;
+select:-internal-list-box:disabled option:checked,
+select:-internal-list-box option:checked:disabled {
+    color: gray !important;
 }
 
-select:disabled option:checked,
-select:disabled[size] option:checked,
-select:disabled[multiple] option:checked,
-select:disabled[size][multiple] option:checked,
-option:checked:disabled,
-select[size] option:checked:disabled,
-select[multiple] option:checked:disabled,
-select[size][multiple] option:checked:disabled {
-    color: gray;
-}
 
 output {
     display: inline;