Version: Unity 6.6 Beta (6000.6)
Language : English
Introduction to USS built-in variables
Get custom styles in C# scripts

USS built-in variable references

The following tables list all the USS built-in variables.

metrics

Group Role/Control Name Description Professional Personal Runtime
metrics
--unity-metrics-default-border_radius The default border radius for controls 3px 3px 0px
--unity-metrics-default-font_big_size The big font size 14px 14px 15px
--unity-metrics-default-font_normal_size The normal font size 12px 12px 14px
--unity-metrics-default-font_semi_small_size The semi small font size 11px 11px 13px
--unity-metrics-default-font_small_size The small font size 10px 10px 12px
--unity-metrics-default-font_tiny_size The tiny font size 9px 9px 11px
--unity-metrics-default-font_very_big_size The very big font size 19px 19px 21px
--unity-metrics-inspector_titlebar-height The height of a title bar in an Inspector view 22px 22px Undefined
--unity-metrics-single_line-height The usual height for a single-line Editor control, for example, a one-line text field.
See EditorGUIUtility.singleLineHeight
18px 18px Undefined
--unity-metrics-single_line_large-height The usual height for a large single-line Editor control, for example, an Inspector title bar label 20px 20px Undefined
--unity-metrics-single_line_small-height The usual height for a small single-line Editor control, for example, a mini toggle or a mini text field 16px 16px Undefined
--unity-metrics-toolbar-height The height of a toolbar control 21px 21px Undefined
--unity-metrics-toolbar_button-height The height of a toolbar button control 20px 20px Undefined
****
--current-font UIPackageResources/Fonts/Inter/Inter-Regular SDF.asset UIPackageResources/Fonts/Inter/Inter-Regular SDF.asset Undefined
colors
alternated_rows
--unity-colors-alternated_rows-background The alternate background color for views with alternating row colors #3F3F3F #CACACA Undefined
app_toolbar
--unity-colors-app_toolbar-background The background color for the main toolbar #191919 #8A8A8A Undefined
app_toolbar_button
--unity-colors-app_toolbar_button-background The background color for a button in the main toolbar #383838 #C8C8C8 Undefined
--unity-colors-app_toolbar_button-background-checked The background color for a button in the main toolbar when it is checked #6A6A6A #656565 Undefined
--unity-colors-app_toolbar_button-background-hover The background color for a button in the main toolbar when the mouse pointer hovers over them #424242 #BBBBBB Undefined
--unity-colors-app_toolbar_button-background-pressed The background color for a button in the main toolbar when it is pressed #6A6A6A #656565 Undefined
--unity-colors-app_toolbar_button-border The border color for a button in the main toolbar #191919 #6B6B6B Undefined
--unity-colors-app_toolbar_button-border_accent The accent border color for a button in the main toolbar #222222 #6B6B6B Undefined
box
--unity-colors-box-background The background color for a box control rgba(40, 40, 40, 0.3019608) rgba(185, 185, 185, 0.9019608) #DEDEDE
--unity-colors-box-border The border color for a box control transparent transparent #555555
button
--unity-colors-button-background The background color for a button control #585858 #E4E4E4 #BCBCBC
--unity-colors-button-background-disabled Undefined Undefined #959595
--unity-colors-button-background-focus The background color for a button control when it has focus #6E6E6E #BEBEBE Undefined
--unity-colors-button-background-hover The background color for a button control when the mouse pointer hovers over it #676767 #ECECEC #D1D1D1
--unity-colors-button-background-hover_pressed The background color for a button control when it is hoverd and pressed #4F657F #B0D2FC Undefined
--unity-colors-button-background-pressed The background color for a button control when it is pressed #46607C #96C3FB #959595
--unity-colors-button-border The border color for a button control #303030 #B2B2B2 #959595
--unity-colors-button-border_accent The border accent color for a button control #242424 #939393 Undefined
--unity-colors-button-border_accent-focus The border accent color used for a button control when focused #7BAEFA #018CFF Undefined
--unity-colors-button-border-disabled Undefined Undefined #7E7E7E
--unity-colors-button-border-focus Undefined Undefined #006AA6
--unity-colors-button-border-hover Undefined Undefined #808080
--unity-colors-button-border-pressed The border color for a button control when it is pressed #0D0D0D #707070 #646464
--unity-colors-button-text The text color for a button control #EEEEEE #090909 #1B1B1B
--unity-colors-button-text-disabled Undefined Undefined #2D2D2D
default
--unity-colors-default-background The default background color for controls #282828 #A5A5A5 Undefined
--unity-colors-default-border The default border color for controls #232323 #999999 #959595
--unity-colors-default-text The default text color #D2D2D2 #090909 #1B1B1B
--unity-colors-default-text-hover The default text color when the mouse pointer hovers over the text #BDBDBD #090909 Undefined
dropdown
--unity-colors-dropdown-background The background color for a dropdown control #515151 #DFDFDF #DFDFDF
--unity-colors-dropdown-background-hover The background color for a dropdown control when the mouse pointer hovers over it #585858 #E4E4E4 #E8E8E8
--unity-colors-dropdown-border The border color for a dropdown control #303030 #B2B2B2 #999999
--unity-colors-dropdown-border_accent The border accent color for a dropdown control #242424 #939393 #939393
--unity-colors-dropdown-text The text color for a dropdown control #E4E4E4 #090909 #1B1B1B
error
--unity-colors-error-text The text color for error messages #D32222 #5A0000 Undefined
headerbar
--unity-colors-headerbar-background The background color for a header bar control #3C3C3C #CBCBCB #BCBCBC
headerbar_column
--unity-colors-headerbar_column-background The background color used for a column control in a header bar #3C3C3C #CBCBCB #BCBCBC
--unity-colors-headerbar_column-background-hover The background color used for a button control when hovered over #464646 #C1C1C1 #D1D1D1
--unity-colors-headerbar_column-background-pressed The background color used for a button control when pressed #505050 #EFEFEF #959595
helpbox
--unity-colors-helpbox-background The background color for a helpbox control rgba(96, 96, 96, 0.2039216) rgba(235, 235, 235, 0.2039216) Undefined
--unity-colors-helpbox-border The border color for a helpbox control #232323 #A9A9A9 Undefined
--unity-colors-helpbox-text The text color for a helpbox control #BDBDBD #161616 Undefined
highlight
--unity-colors-highlight-background The background color for selected items or selected text #2C5D87 #3A72B0 Undefined
--unity-colors-highlight-background-hover The background color for items when the mouse pointer hovers over them rgba(256, 256, 256, 0.0627451) rgba(0, 0, 0, 0.0627451) Undefined
--unity-colors-highlight-background-hover-lighter #5F5F5F #9A9A9A Undefined
--unity-colors-highlight-background-inactive The background color for selected items or selected text when the control does not have focus #4D4D4D #AEAEAE Undefined
--unity-colors-highlight-text The text color for selected items or selected text #4C7EFF #0032E6 Undefined
--unity-colors-highlight-text-inactive The text color for selected items or selected text when the control does not have focus #FFFFFF #FFFFFF Undefined
input_field
--unity-colors-input_field-background The background color for an input field control #2A2A2A #F0F0F0 #F0F0F0
--unity-colors-input_field-background-disabled Undefined Undefined #D1D1D1
--unity-colors-input_field-border The border color for an input field control #212121 #B7B7B7 #646464
--unity-colors-input_field-border_accent The border accent color for an input field control #0D0D0D #A0A0A0 Undefined
--unity-colors-input_field-border-focus The border color for an input field control when it has focus #3A79BB #1D5087 #006AA6
--unity-colors-input_field-border-hover The border color for an input field control when the mouse pointer hovers over it #656565 #6C6C6C #323232
--unity-colors-input_field-text-disabled Undefined Undefined #585858
inspector_titlebar
--unity-colors-inspector_titlebar-background The background color for a title bar in an Inspector view #3E3E3E #CBCBCB Undefined
--unity-colors-inspector_titlebar-background-hover The background color for a title bar in an Inspector view when the mouse pointer hovers over it #474747 #D6D6D6 Undefined
--unity-colors-inspector_titlebar-border The border color for a title bar in an Inspector view #1A1A1A #7F7F7F Undefined
--unity-colors-inspector_titlebar-border_accent The border accent color for a title bar in an Inspector view #303030 #BABABA Undefined
label
--unity-colors-label-text The text color for a label control #C4C4C4 #090909 #1B1B1B
--unity-colors-label-text-disabled Undefined Undefined #585858
--unity-colors-label-text-focus The text color for a label when it has focus #81B4FF #003C88 #00526A
link
--unity-colors-link-text The text color for unvisited links #4C7EFF #4C7EFF Undefined
list_view_item
--unity-colors-list_view_item-background-hover The background color for line items generally found in ListView and other similar controls when the mouse pointer hovers over them #303030 #B2B2B2 Undefined
minmax_slider_thumb
--unity-colors-minmax_slider_thumb-background Undefined Undefined #BCBCBC
object_field
--unity-colors-object_field-background The background color for an object field control #282828 #EDEDED Undefined
--unity-colors-object_field-border The border color for an object field control #202020 #B0B0B0 Undefined
--unity-colors-object_field-border-focus The border color for an object field control when it has focus #3A79BB #1D5087 Undefined
--unity-colors-object_field-border-hover The border color for an object field control when the mouse pointer hovers over it #656565 #6C6C6C Undefined
object_field_button
--unity-colors-object_field_button-background The background color for the button in an object field control #373737 #DEDEDE Undefined
--unity-colors-object_field_button-background-hover The background color for the button in an object field control when the mouse pointer hovers over it #4C4C4C #CCCCCC Undefined
play_mode
--unity-colors-play_mode-background The color used to tint the UI in Play Mode #606060 #ECECEC Undefined
popup
--unity-colors-popup-background The background color for a popup window #313131 #C1C1C1 Undefined
preview
--unity-colors-preview-background The background color for a preview control #313131 #C1C1C1 Undefined
--unity-colors-preview-border The border color for a preview control #232323 #999999 Undefined
--unity-colors-preview-text The text color for a preview control #BDBDBD #090909 Undefined
preview_overlay
--unity-colors-preview_overlay-text The text color for a preview control overlay #DEDEDE #FFFFFF Undefined
progress
--unity-colors-progress-background #303030 #606060 Undefined
progress_bar
--unity-colors-progress_bar-background Undefined Undefined #BCBCBC
--unity-colors-progress_bar-border Undefined Undefined #808080
--unity-colors-progress_bar-text Undefined Undefined #1B1B1B
progress_bar_progress
--unity-colors-progress_bar_progress-background Undefined Undefined #E7E7E7
scrollbar_button
--unity-colors-scrollbar_button-background The background color for a scrollbar’s scroll buttons rgba(0, 0, 0, 0.05098039) rgba(0, 0, 0, 0.05098039) #F0F0F0
--unity-colors-scrollbar_button-background-hover The background color for a scrollbar’s scroll buttons when the mouse pointer hovers over them #494949 #A7A7A7 #E7E7E7
--unity-colors-scrollbar_button-border Undefined Undefined #959595
--unity-colors-scrollbar_button-border-focus Undefined Undefined #006AA6
--unity-colors-scrollbar_button-border-hover Undefined Undefined #959595
scrollbar_groove
--unity-colors-scrollbar_groove-background The background color for a scrollbar’s groove (background) rgba(0, 0, 0, 0.05098039) rgba(0, 0, 0, 0.05098039) #BCBCBC
--unity-colors-scrollbar_groove-border The border color for a scrollbar’s groove rgba(0, 0, 0, 0.1019608) rgba(0, 0, 0, 0.1019608) #959595
scrollbar_thumb
--unity-colors-scrollbar_thumb-background The background color for a scrollbar’s thumb/handle #5F5F5F #9A9A9A #E7E7E7
--unity-colors-scrollbar_thumb-background-hover The background color for a scrollbar’s thumb/handle when the mouse pointer hovers over it #686868 #8E8E8E #F0F0F0
--unity-colors-scrollbar_thumb-background-pressed Undefined Undefined #F0F0F0
--unity-colors-scrollbar_thumb-border The border color for a scrollbar’s thumb/handle #323232 #B9B9B9 transparent
--unity-colors-scrollbar_thumb-border-focus Undefined Undefined #00516A
--unity-colors-scrollbar_thumb-border-hover The border color for a scrollbar’s thumb/handle when the mouse pointer hovers over it #686868 #8E8E8E transparent
--unity-colors-scrollbar_thumb-border-pressed Undefined Undefined transparent
slider_groove
--unity-colors-slider_groove-background The background color for a slider’s groove (background) #5E5E5E #8F8F8F #7E7E7E
--unity-colors-slider_groove-background-disabled The background color for a slider’s groove when it is disabled #575757 #A4A4A4 #7E7E7E
--unity-colors-slider_groove-background-focus Undefined Undefined #7E7E7E
--unity-colors-slider_groove-background-hover Undefined Undefined #7E7E7E
--unity-colors-slider_groove-border Undefined Undefined #646464
slider_thumb
--unity-colors-slider_thumb-background The background color for a slider’s thumb/handle #999999 #616161 #F0F0F0
--unity-colors-slider_thumb-background-disabled The background color for a slider’s thumb/handle when it is disabled #666666 #9B9B9B #808080
--unity-colors-slider_thumb-background-focus Undefined Undefined #F0F0F0
--unity-colors-slider_thumb-background-hover The background color for a slider’s thumb/handle when the mouse pointer hovers over it #EAEAEA #4F4F4F #F0F0F0
--unity-colors-slider_thumb-border The border color for a slider’s thumb #999999 #616161 #646464
--unity-colors-slider_thumb-border-disabled The border color for a slider’s thumb when it is disabled #666666 #666666 #7E7E7E
--unity-colors-slider_thumb-border-focus Undefined Undefined #006AA6
--unity-colors-slider_thumb-border-hover Undefined Undefined #323232
slider_thumb_halo
--unity-colors-slider_thumb_halo-background The background color for a slider’s thumb halo rgba(16, 111, 205, 0.5019608) rgba(12, 108, 203, 0.5019608) rgba(12, 108, 203, 0.5019608)
tab
--unity-colors-tab-background The background color for an Editor window tab #353535 #B6B6B6 Undefined
--unity-colors-tab-background-checked The background color for an Editor window tab when it is selected #3C3C3C #CBCBCB Undefined
--unity-colors-tab-background-hover The background color for an Editor window tab when the mouse pointer hovers over it #303030 #B0B0B0 Undefined
--unity-colors-tab-text The text color for an Editor window tab #BDBDBD #090909 Undefined
toggle
--unity-colors-toggle-text-disabled Undefined Undefined #585858
toggle_checkmark
--unity-colors-toggle_checkmark-background Undefined Undefined #F0F0F0
--unity-colors-toggle_checkmark-background-disabled Undefined Undefined #959595
--unity-colors-toggle_checkmark-border Undefined Undefined #646464
--unity-colors-toggle_checkmark-border-disabled Undefined Undefined #7E7E7E
--unity-colors-toggle_checkmark-border-focus Undefined Undefined #006AA6
--unity-colors-toggle_checkmark-border-hover Undefined Undefined #323232
--unity-colors-toggle_checkmark-border-pressed Undefined Undefined #323232
toolbar
--unity-colors-toolbar-background The background color for a toolbar control #3C3C3C #CBCBCB Undefined
--unity-colors-toolbar-border The border color for a toolbar control #232323 #999999 Undefined
toolbar_button
--unity-colors-toolbar_button-background The background color for a toolbar button control #3C3C3C #CBCBCB Undefined
--unity-colors-toolbar_button-background-checked The background color for a toolbar button control when it is checked #505050 #EFEFEF Undefined
--unity-colors-toolbar_button-background-focus The background color for a toolbar button control when it has focus #464646 #C1C1C1 Undefined
--unity-colors-toolbar_button-background-hover The background color for a toolbar button control when the mouse pointer hovers over it #464646 #C1C1C1 Undefined
--unity-colors-toolbar_button-border The border color for a toolbar button control #232323 #999999 Undefined
--unity-colors-toolbar_button-text The text color for a toolbar button control #C4C4C4 #090909 Undefined
--unity-colors-toolbar_button-text-checked The text color for a toolbar button control when it is checked #C4C4C4 #090909 Undefined
--unity-colors-toolbar_button-text-hover The text color for a toolbar button control #BDBDBD #090909 Undefined
tooltip
--unity-colors-tooltip-background #373737 #DEDEDE Undefined
--unity-colors-tooltip-border #191919 #8A8A8A Undefined
visited_link
--unity-colors-visited_link-text The text color for visited links #FF00FF #AA00AA Undefined
warning
--unity-colors-warning-text The text color for warning messages #F4BC02 #333308 Undefined
window
--unity-colors-window-background The background color for a window #383838 #C8C8C8 Undefined
--unity-colors-window-border The border color for a window #242424 #939393 Undefined
--unity-colors-window-text The text color for a window #BDBDBD #090909 #1B1B1B
font
--unity-font-button-padding-bottom 1px 1px Undefined
--unity-font-button-padding-top 1px 1px Undefined
--unity-font-popup-padding-bottom 1px 1px Undefined
--unity-font-popup-padding-top 0 0 Undefined
--unity-font-standard-padding-bottom 0 0 Undefined
--unity-font-standard-padding-bottom-with-border 0 0 Undefined
icons
--unity-icons-arrow_left Builtin Skins/DarkSkin/Images/ArrowNavigationLeft.png Builtin Skins/LightSkin/Images/ArrowNavigationLeft.png Undefined
--unity-icons-arrow_right Builtin Skins/DarkSkin/Images/ArrowNavigationRight.png Builtin Skins/LightSkin/Images/ArrowNavigationRight.png Undefined
--unity-icons-clear UIPackageResources/Images/d_clear.png UIPackageResources/Images/clear.png Undefined
--unity-icons-color_picker UIPackageResources/Images/d_color_picker.png UIPackageResources/Images/color_picker.png Undefined
--unity-icons-console_entry_error Icons/d_console.erroricon.png Icons/console.erroricon.png Undefined
--unity-icons-console_entry_error_small Icons/d_console.erroricon.sml.png Icons/console.erroricon.sml.png Undefined
--unity-icons-console_entry_info Icons/d_console.infoicon.png Icons/console.infoicon.png Undefined
--unity-icons-console_entry_info_small Icons/d_console.infoicon.sml.png Icons/console.infoicon.sml.png Undefined
--unity-icons-console_entry_warn Icons/d_console.warnicon.png Icons/console.warnicon.png Undefined
--unity-icons-console_entry_warn_small Icons/d_console.warnicon.sml.png Icons/console.warnicon.sml.png Undefined
--unity-icons-dropdown UIPackageResources/Images/d_dropdown.png UIPackageResources/Images/dropdown.png Undefined
--unity-icons-dropdown_toggle UIPackageResources/Images/d_dropdown_toggle.png UIPackageResources/Images/dropdown_toggle.png Undefined
--unity-icons-foldout UIPackageResources/Images/d_IN_foldout.png UIPackageResources/Images/IN_foldout.png Undefined
--unity-icons-foldout-checked UIPackageResources/Images/d_IN_foldout_on.png UIPackageResources/Images/IN_foldout_on.png Undefined
--unity-icons-foldout-checked_focus UIPackageResources/Images/d_IN_foldout_focus_on.png UIPackageResources/Images/IN_foldout_focus_on.png Undefined
--unity-icons-foldout-checked_pressed UIPackageResources/Images/d_IN_foldout_act_on.png UIPackageResources/Images/IN_foldout_act_on.png Undefined
--unity-icons-foldout-focus UIPackageResources/Images/d_IN_foldout_focus.png UIPackageResources/Images/IN_foldout_focus.png Undefined
--unity-icons-foldout-pressed UIPackageResources/Images/d_IN_foldout_act.png UIPackageResources/Images/IN_foldout_act.png Undefined
--unity-icons-link Icons/d_UnLinked.png Icons/UnLinked.png Undefined
--unity-icons-link-checked Icons/d_Linked.png Icons/Linked.png Undefined
--unity-icons-lock Builtin Skins/DarkSkin/Images/IN LockButton.png Builtin Skins/LightSkin/Images/IN LockButton.png Undefined
--unity-icons-lock-checked Builtin Skins/DarkSkin/Images/IN LockButton on.png Builtin Skins/LightSkin/Images/IN LockButton on.png Undefined
--unity-icons-lock-checked_pressed Builtin Skins/DarkSkin/Images/IN LockButton on act.png Builtin Skins/LightSkin/Images/IN LockButton on act.png Undefined
--unity-icons-lock-pressed Builtin Skins/DarkSkin/Images/IN LockButton act.png Builtin Skins/LightSkin/Images/IN LockButton act.png Undefined
--unity-icons-minus UIPackageResources/Images/d_ol_minus.png UIPackageResources/Images/ol_minus.png Undefined
--unity-icons-minus-hover UIPackageResources/Images/d_ol_minus_act.png UIPackageResources/Images/ol_minus_act.png Undefined
--unity-icons-pane_options Builtin Skins/DarkSkin/Images/pane options.png Builtin Skins/LightSkin/Images/pane options.png Undefined
--unity-icons-picker UIPackageResources/Images/d_pick.png UIPackageResources/Images/pick.png Undefined
--unity-icons-plus UIPackageResources/Images/d_ol_plus.png UIPackageResources/Images/ol_plus.png Undefined
--unity-icons-plus-hover UIPackageResources/Images/d_ol_plus_act.png UIPackageResources/Images/ol_plus_act.png Undefined
--unity-icons-profiler_timeline_digdown_arrow Profiler/d_ProfilerTimelineDigDownArrow.png Profiler/ProfilerTimelineDigDownArrow.png Undefined
--unity-icons-profiler_timeline_rollup_arrow Profiler/d_ProfilerTimelineRollUpArrow.png Profiler/ProfilerTimelineRollUpArrow.png Undefined
--unity-icons-pulldown UIPackageResources/Images/d_dropdown.png UIPackageResources/Images/dropdown.png Undefined
--unity-icons-scroll_down UIPackageResources/Images/d_scrolldown.png UIPackageResources/Images/scrolldown.png Undefined
--unity-icons-scroll_left UIPackageResources/Images/d_scrollleft.png UIPackageResources/Images/scrollleft.png Undefined
--unity-icons-scroll_right UIPackageResources/Images/d_scrollright.png UIPackageResources/Images/scrollright.png Undefined
--unity-icons-scroll_up UIPackageResources/Images/d_scrollup.png UIPackageResources/Images/scrollup.png Undefined
--unity-icons-search UIPackageResources/Images/d_search_icon.png UIPackageResources/Images/search_icon.png Undefined
--unity-icons-search_menu UIPackageResources/Images/d_search_menu.png UIPackageResources/Images/search_menu.png Undefined
--unity-icons-shuriken_toggle-checked Builtin Skins/DarkSkin/Images/ShurikenToggleNormalOn.png Builtin Skins/LightSkin/Images/ShurikenToggleNormalOn.png Undefined
--unity-icons-shuriken_toggle-checked_focus Builtin Skins/DarkSkin/Images/ShurikenToggleFocusedOn.png Builtin Skins/LightSkin/Images/ShurikenToggleFocusedOn.png Undefined
--unity-icons-shuriken_toggle-checked_hover Builtin Skins/DarkSkin/Images/ShurikenToggleHoverOn.png Builtin Skins/LightSkin/Images/ShurikenToggleHoverOn.png Undefined
--unity-icons-shuriken_toggle_bg Builtin Skins/DarkSkin/Images/ShurikenToggleNormal.png Builtin Skins/LightSkin/Images/ShurikenToggleNormal.png Undefined
--unity-icons-shuriken_toggle_bg-focus Builtin Skins/DarkSkin/Images/ShurikenToggleFocused.png Builtin Skins/LightSkin/Images/ShurikenToggleFocused.png Undefined
--unity-icons-shuriken_toggle_bg-focus_mixed Builtin Skins/DarkSkin/Images/ShurikenToggleFocusedMixed.png Builtin Skins/LightSkin/Images/ShurikenToggleFocusedMixed.png Undefined
--unity-icons-shuriken_toggle_bg-hover Builtin Skins/DarkSkin/Images/ShurikenToggleHover.png Builtin Skins/LightSkin/Images/ShurikenToggleHover.png Undefined
--unity-icons-shuriken_toggle_bg-hover_mixed Builtin Skins/DarkSkin/Images/ShurikenToggleHoverMixed.png Builtin Skins/LightSkin/Images/ShurikenToggleHoverMixed.png Undefined
--unity-icons-shuriken_toggle_bg-mixed Builtin Skins/DarkSkin/Images/ShurikenToggleNormalMixed.png Builtin Skins/LightSkin/Images/ShurikenToggleNormalMixed.png Undefined
--unity-icons-toggle-checked UIPackageResources/Images/d_toggle_on.png UIPackageResources/Images/toggle_on.png Undefined
--unity-icons-toggle-checked_focus UIPackageResources/Images/d_toggle_on_focus.png UIPackageResources/Images/toggle_on_focus.png Undefined
--unity-icons-toggle-checked_hover UIPackageResources/Images/d_toggle_on_hover.png UIPackageResources/Images/toggle_on_hover.png Undefined
--unity-icons-toggle-focus_mixed UIPackageResources/Images/d_toggle_on_focus.png UIPackageResources/Images/toggle_on_focus.png Undefined
--unity-icons-toggle-hover_mixed UIPackageResources/Images/d_toggle_on_hover.png UIPackageResources/Images/toggle_on_hover.png Undefined
--unity-icons-toggle-mixed UIPackageResources/Images/d_toggle_on.png UIPackageResources/Images/toggle_on.png Undefined
--unity-icons-toggle_bg UIPackageResources/Images/d_toggle_bg.png UIPackageResources/Images/toggle_bg.png Undefined
--unity-icons-toggle_bg-focus UIPackageResources/Images/d_toggle_bg_focus.png UIPackageResources/Images/toggle_bg_focus.png Undefined
--unity-icons-toggle_bg-focus_mixed UIPackageResources/Images/d_toggle_mixed_bg_focus.png UIPackageResources/Images/toggle_mixed_bg_focus.png Undefined
--unity-icons-toggle_bg-hover UIPackageResources/Images/d_toggle_bg_hover.png UIPackageResources/Images/toggle_bg_hover.png Undefined
--unity-icons-toggle_bg-hover_mixed UIPackageResources/Images/d_toggle_mixed_bg_hover.png UIPackageResources/Images/toggle_mixed_bg_hover.png Undefined
--unity-icons-toggle_bg-mixed UIPackageResources/Images/d_toggle_mixed_bg.png UIPackageResources/Images/toggle_mixed_bg.png Undefined
--unity-icons-window_button_close Icons/d_winbtn_win_close.png Icons/winbtn_win_close.png Undefined
--unity-icons-window_button_max Icons/d_winbtn_win_max.png Icons/winbtn_win_max.png Undefined
--unity-icons-window_button_restore Icons/d_winbtn_win_restore.png Icons/winbtn_win_restore.png Undefined

Additional resources

Introduction to USS built-in variables
Get custom styles in C# scripts