+.devtools-toolbarbutton[type=menu] > .toolbarbutton-menu-dropmarker,
+.devtools-toolbarbutton[type=menu-button] > .toolbarbutton-menubutton-dropmarker {
+}
+
+.devtools-menulist,
+.devtools-toolbarbutton {
+}
+
+/* Text-only buttons */
+.devtools-toolbarbutton[label]:not([text-as-image]):not([type=menu-button]),
+#toolbox-buttons .devtools-toolbarbutton[text-as-image] {
+/* background-color: rgba(0, 0, 0, .2); / Splitter */
+}
+
+/* Button States */
+.devtools-toolbarbutton:not([disabled]):hover,
+#toolbox-buttons .devtools-toolbarbutton:not([disabled])[text-as-image]:hover,
+.devtools-toolbarbutton:not([disabled])[label]:not([text-as-image]):not([type=menu-button]):hover {
+/* background: rgba(0, 0, 0, .3); / Splitters */
+}
+
+.devtools-toolbarbutton:not([disabled]):hover:active,
+#toolbox-buttons .devtools-toolbarbutton:not([disabled])[text-as-image]:hover:active,
+.devtools-toolbarbutton:not([disabled])[label]:not([text-as-image]):not([type=menu-button]):hover:active {
+/* background: rgba(0, 0, 0, .4); / Splitters */
+}
+
+/* Menu type buttons and checked states */
+.devtools-toolbarbutton[checked=true],
+#toolbox-buttons .devtools-toolbarbutton[text-as-image][checked] {
+/* background: rgba(29, 79, 115, .7); / Select highlight blue /
+ color: var(--theme-selection-color); */
+}
+
+.devtools-menulist[open=true],
+.devtools-toolbarbutton[open=true],
+.devtools-toolbarbutton[open=true]:hover,
+.devtools-toolbarbutton[open=true]:hover:active,
+.devtools-toolbarbutton[checked=true],
+.devtools-toolbarbutton[checked=true]:hover,
+#toolbox-buttons .devtools-toolbarbutton[text-as-image][checked] {
+/* background: rgba(29, 79, 115, .8); / Select highlight blue /
+ color: var(--theme-selection-color); */
+}
+
+.devtools-toolbarbutton[checked=true]:hover {