| Property | Reference | Notes |
|---|---|---|
| color | CSS Color Level 3 | |
| opacity | CSS Color Level 3 | |
| filter | CSS Filter Effect Level 1 | |
| font-family | CSS Fonts Level 3 | defaults to gtk-font-name setting |
| font-size | CSS Fonts Level 3 | defaults to gtk-font-name setting |
| font-style | CSS Fonts Level 3 | |
| font-variant | CSS Fonts Level 3 | only CSS2 values supported |
| font-weight | CSS Fonts Level 3 | |
| font-stretch | CSS Fonts Level 3 | |
| font-kerning | CSS Fonts Level 3 | |
| font-variant-ligatures | CSS Fonts Level 3 | |
| font-variant-position | CSS Fonts Level 3 | |
| font-variant-caps | CSS Fonts Level 3 | |
| font-variant-numeric | CSS Fonts Level 3 | |
| font-variant-alternates | CSS Fonts Level 3 | |
| font-variant-east-asian | CSS Fonts Level 3 | |
| font-feature-settings | CSS Fonts Level 3 | |
| font-variation-settings | CSS Fonts Level 4 | |
| -gtk-dpi | Number | defaults to screen resolution |
| font | CSS Fonts Level 3 | CSS allows line-height, etc |
| font-variant | CSS Fonts Level 3 | |
| caret-color | CSS Basic User Interface Level 3 | CSS allows an auto value |
| -gtk-secondary-caret-color | Color | used for the secondary caret in bidirectional text |
| letter-spacing | CSS Text Level 3 | |
| text-decoration-line | CSS Text Decoration Level 3 | CSS allows overline |
| text-decoration-color | CSS Text Decoration Level 3 | |
| text-decoration-style | CSS Text Decoration Level 3 | CSS allows dashed and dotted |
| text-shadow | CSS Text Decoration Level 3 | |
| text-decoration | CSS Text Decoration Level 3 | |
| -gtk-icon-source | Image, builtin or none | used for builtin icons in buttons and expanders |
| -gtk-icon-size | Length | size used for builtin icons in buttons and expanders |
| -gtk-icon-style | requested, regular or symbolic | preferred style for application-loaded icons |
| -gtk-icon-transform | Transform list or none | applied to builtin and application-loaded icons |
| -gtk-icon-palette | Color palette, as explained above | used to recolor symbolic icons |
| -gtk-icon-shadow | Shadow or none | applied to builtin and application-loaded icons |
| -gtk-icon-filter | Filter value list or none | applied to builtin and application-loaded icons |
| transform | CSS Transforms Level 2 | |
| min-width | CSS Box Model Level 3 | CSS allows percentages |
| min-height | CSS Box Model Level 3 | CSS allows percentages |
| margin-top | CSS Box Model Level 3 | CSS allows percentages or auto |
| margin-right | CSS Box Model Level 3 | CSS allows percentages or auto |
| margin-bottom | CSS Box Model Level 3 | CSS allows percentages or auto |
| margin-left | CSS Box Model Level 3 | CSS allows percentages or auto |
| padding-top | CSS Box Model Level 3 | CSS allows percentages |
| padding-right | CSS Box Model Level 3 | CSS allows percentages |
| padding-bottom | CSS Box Model Level 3 | CSS allows percentages |
| padding-left | CSS Box Model Level 3 | CSS allows percentages |
| margin | CSS Box Model Level 3 | a “four sides” property |
| padding | CSS Box Model Level 3 | a “four sides” property |
| border-top-width | CSS Backgrounds and Borders Level 3 | CSS allows other values |
| border-right-width | CSS Backgrounds and Borders Level 3 | CSS allows other values |
| border-bottom-width | CSS Backgrounds and Borders Level 3 | CSS allows other values |
| border-left-width | CSS Backgrounds and Borders Level 3 | CSS allows other values |
| border-top-style | CSS Backgrounds and Borders Level 3 | |
| border-right-style | CSS Backgrounds and Borders Level 3 | |
| border-bottom-style | CSS Backgrounds and Borders Level 3 | |
| border-left-style | CSS Backgrounds and Borders Level 3 | |
| border-top-right-radius | CSS Backgrounds and Borders Level 3 | |
| border-bottom-right-radius | CSS Backgrounds and Borders Level 3 | |
| border-bottom-left-radius | CSS Backgrounds and Borders Level 3 | |
| border-top-left-radius | CSS Backgrounds and Borders Level 3 | |
| border-top-color | CSS Backgrounds and Borders Level 3 | |
| border-right-color | CSS Backgrounds and Borders Level 3 | |
| border-bottom-color | CSS Backgrounds and Borders Level 3 | |
| border-left-color | CSS Backgrounds and Borders Level 3 | |
| border-image-source | CSS Backgrounds and Borders Level 3 | |
| border-image-repeat | CSS Backgrounds and Borders Level 3 | |
| border-image-slice | CSS Backgrounds and Borders Level 3 | a “four sides” property |
| border-image-width | CSS Backgrounds and Borders Level 3 | a “four sides” property |
| border-width | CSS Backgrounds and Borders Level 3 | a “four sides” property |
| border-style | CSS Backgrounds and Borders Level 3 | a “four sides” property |
| border-color | CSS Backgrounds and Borders Level 3 | a “four sides” property |
| border-top | CSS Backgrounds and Borders Level 3 | |
| border-right | CSS Backgrounds and Borders Level 3 | |
| border-bottom | CSS Backgrounds and Borders Level 3 | |
| border-left | CSS Backgrounds and Borders Level 3 | |
| border | CSS Backgrounds and Borders Level 3 | |
| border-radius | CSS Backgrounds and Borders Level 3 | |
| border-image | CSS Backgrounds and Borders Level 3 | |
| outline-style | CSS Basic User Interface Level 3 | initial value is none, auto is not supported |
| outline-width | CSS Basic User Interface Level 3 | |
| outline-color | CSS Basic User Interface Level 3 | initial value is currentColor, invert is not supported |
| outline-offset | CSS Basic User Interface Level 3 | |
| outline | CSS Basic User Interface Level 3 | |
| background-color | CSS Backgrounds and Borders Level 3 | |
| background-clip | CSS Backgrounds and Borders Level 3 | |
| background-origin | CSS Backgrounds and Borders Level 3 | |
| background-size | CSS Backgrounds and Borders Level 3 | |
| background-position | CSS Backgrounds and Borders Level 3 | |
| background-repeat | CSS Backgrounds and Borders Level 3 | |
| background-image | CSS Backgrounds and Borders Level 3 | not supported: urls without quotes, colors in crossfades |
| box-shadow | CSS Backgrounds and Borders Level 3 | |
| background-blend-mode | CSS Compositing and Blending Level 1 | only affects multiple backgrounds |
| background | CSS Backgrounds and Borders Level 3 | |
| transition-property | CSS Transitions | |
| transition-duration | CSS Transitions | |
| transition-timing-function | CSS Transitions | |
| transition-delay | CSS Transitions | |
| transition | CSS Transitions | |
| animation-name | CSS Animations Level 1 | |
| animation-duration | CSS Animations Level 1 | |
| animation-timing-function | CSS Animations Level 1 | |
| animation-iteration-count | CSS Animations Level 1 | |
| animation-direction | CSS Animations Level 1 | |
| animation-play-state | CSS Animations Level 1 | |
| animation-delay | CSS Animations Level 1 | |
| animation-fill-mode | CSS Animations Level 1 | |
| animation | CSS Animations Level 1 | |
| border-spacing | CSS Table Level 3 | respected by GtkBox and GtkGrid |
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Licensed under the GNU Lesser General Public License version 2.1 or later.
https://developer.gnome.org/gtk4/4.0/ch39s04.html