DevTools: Add hover affordance for checkboxes

Source/devtools/front_end/inspector.css

Index: Source/devtools/front_end/inspector.css
diff --git a/Source/devtools/front_end/inspector.css b/Source/devtools/front_end/inspector.css
index 5bc114cd8cc742c45812c58f87fbbba158f99927..3181b034d468d3693bc3db7a56f78408900b5347 100644
--- a/Source/devtools/front_end/inspector.css
+++ b/Source/devtools/front_end/inspector.css
@@ -39,6 +39,18 @@ input[type="checkbox"] {
     flex-shrink: 0;
 }
 
+label:hover {
+    cursor: pointer;
+}
+
+label:hover input {
+    box-shadow: 0 0 3px highlight;
+}
+
+fieldset[disabled] label:hover input {
+    box-shadow: none;
+}
+
 .fill {
     position: absolute;
     top: 0;