Supported CSS Specifications

Prince supports, fully or partially, the following CSS specifications:

CSS Level 2

CSS 2.1 Prince supports the specification, with few exceptions: Prince does not support the quotes property or the open-quote and close-quote values. Prince does not support properties that apply only to interactive media. Note that this includes outline and its outline-* subproperties. For similar reasons, Prince does not support visibility: collapse. Prince does not support the armenian or georgian list styles. Prince treats 1ex equivalently to 0.5em, which might not be correct for some fonts.

CSS Level 3

CSS Backgrounds and Borders Module Level 3 Prince does not support box-shadow and the border-image properties.

CSS Fragmentation Module Level 3 Prince largely supports this module. Please note that the initial value of widows and orphans has been changed from 2 to 1.

CSS Color Module Level 3 Prince supports opacity. It supports some of the extensions of the color property. rgba() is supported in builds after Prince 11, hsl() and hsla() are supported as of Prince 12.1 .

CSS Generated Content Module Level 3 Prince does not recognize the quotes property and the quote-related content types.

CSS Fonts Module Level 3 Beyond the definitions in CSS 2.1, Prince supports font-stretch, font-kerning, font-variant-caps and font-variant-ligatures. Prince also provides a different interface to the functionality of the font-feature-settings property through the font-variant: prince-opentype() function.

CSS Lists and Counters Module Level 3 Prince does not support the marker-side and counter-set properties.

CSS Generated Content for Paged Media Module Prince recognizes footnote-display and string-set as well as the mechanism for running elements. It does not recognize the running or footnote-policy properties, but Prince provides a different interface to the functionality of footnotes (see Footnotes).

CSS Page Floats - Editor's Draft Prince recognizes the properties float, float-reference and float-defer, but takes a different syntax.

CSS Images Module Level 3 Prince supports the mandatory values of image-orientation, as well as the properties object-fit and object-position.

CSS Multi-column Layout Module Level 1 Prince largely supports this module.

CSS Overflow Module Level 3 Prince supports the overflow property's behaviour as described in the Level 3 module, but does not support the 2-value syntax.

CSS Paged Media Module Level 3 Prince supports this module.

CSS Text Module Level 3 Prince does not recognize line-break, text-align-all and hanging-punctuation. It does not support the value break-word of the property word-break, nor the value anywhere of the property overflow-wrap, nor the value break-spaces of the property white-space.

CSS Transforms Module Level 1 Prince recognizes transform and transform-origin, but does not recognize transform-box. Prince does not allow perspective transforms.

CSS Basic User Interface Module Level 3 (CSS3 UI) Prince recognizes box-sizing and text-overflow.

CSS Writing Modes Level 3 Prince partially implements writing-mode.

CSS Namespaces Module Level 3 Prince supports namespaces in CSS.

CSS Conditional Rules Module Level 3 Prince supports the @media and @supports at-rules.

Filter Effects Module Level 1 - Editor's Draft Prince supports the filter, color-interpolation-filters, flood-color and flood-opacity properties.

CSS Level 4

CSS Flexible Box Layout Module Level 1 Prince supports this module as of Prince 12, with the exception of page breaking/fragmentation, break-before/-after, visibility: collapse and vertical writing.

Selectors Level 4 Prince largely supports this module.

Media Queries Level 4 Prince supports this module as of Prince 11.1.

CSS Cascading and Inheritance Level 4 Prince supports the new supports() condition for the @import rule.

CSS Backgrounds and Borders Module Level 4 Prince recognizes the border-clip property, but takes a different syntax.

CSS Images Module Level 4 - Editor's Draft Prince recognizes image-resolution, but takes a different syntax.

CSS Custom Properties for Cascading Variables Module Level 1 Prince supports this module.

Living Standards

CSS Books Prince supports target counters, footnote floats, bookmarks labels, levels and states, the flow property and the string-set property.

CSS Figures Prince largely supports the float extensions of the spec.

SVG

SVG 1.1 Prince supports the specification with some exceptions - please see Scalable Vector Graphics (SVG) for a full list of currently not supported elements.

CSS Level 2
CSS 2.1	Prince supports the specification, with few exceptions: Prince does not support the `quotes` property or the `open-quote` and `close-quote` values. Prince does not support properties that apply only to interactive media. Note that this includes `outline` and its `outline-*` subproperties. For similar reasons, Prince does not support `visibility: collapse`. Prince does not support the `armenian` or `georgian` list styles. Prince treats `1ex` equivalently to `0.5em`, which might not be correct for some fonts.
CSS Level 3
CSS Backgrounds and Borders Module Level 3	Prince does not support `box-shadow` and the `border-image` properties.
CSS Fragmentation Module Level 3	Prince largely supports this module. Please note that the initial value of `widows` and `orphans` has been changed from `2` to `1`.
CSS Color Module Level 3	Prince supports `opacity`. It supports some of the extensions of the `color` property. `rgba()` is supported in builds after Prince 11, `hsl()` and `hsla()` are supported as of Prince 12.1 .
CSS Generated Content Module Level 3	Prince does not recognize the `quotes` property and the quote-related content types.
CSS Fonts Module Level 3	Beyond the definitions in CSS 2.1, Prince supports `font-stretch`, `font-kerning`, `font-variant-caps` and `font-variant-ligatures`. Prince also provides a different interface to the functionality of the `font-feature-settings` property through the `font-variant: prince-opentype()` function.
CSS Lists and Counters Module Level 3	Prince does not support the `marker-side` and `counter-set` properties.
CSS Generated Content for Paged Media Module	Prince recognizes `footnote-display` and `string-set` as well as the mechanism for running elements. It does not recognize the `running` or `footnote-policy` properties, but Prince provides a different interface to the functionality of footnotes (see Footnotes).
CSS Page Floats - Editor's Draft	Prince recognizes the properties `float`, `float-reference` and `float-defer`, but takes a different syntax.
CSS Images Module Level 3	Prince supports the mandatory values of `image-orientation`, as well as the properties `object-fit` and `object-position`.
CSS Multi-column Layout Module Level 1	Prince largely supports this module.
CSS Overflow Module Level 3	Prince supports the `overflow` property's behaviour as described in the Level 3 module, but does not support the 2-value syntax.
CSS Paged Media Module Level 3	Prince supports this module.
CSS Text Module Level 3	Prince does not recognize `line-break`, `text-align-all` and `hanging-punctuation`. It does not support the value `break-word` of the property `word-break`, nor the value `anywhere` of the property `overflow-wrap`, nor the value `break-spaces` of the property `white-space`.
CSS Transforms Module Level 1	Prince recognizes `transform` and `transform-origin`, but does not recognize `transform-box`. Prince does not allow perspective transforms.
CSS Basic User Interface Module Level 3 (CSS3 UI)	Prince recognizes `box-sizing` and `text-overflow`.
CSS Writing Modes Level 3	Prince partially implements `writing-mode`.
CSS Namespaces Module Level 3	Prince supports namespaces in CSS.
CSS Conditional Rules Module Level 3	Prince supports the `@media` and `@supports` at-rules.
Filter Effects Module Level 1 - Editor's Draft	Prince supports the `filter`, `color-interpolation-filters`, `flood-color` and `flood-opacity` properties.
CSS Level 4
CSS Flexible Box Layout Module Level 1	Prince supports this module as of Prince 12, with the exception of page breaking/fragmentation, `break-before`/`-after`, `visibility: collapse` and vertical writing.
Selectors Level 4	Prince largely supports this module.
Media Queries Level 4	Prince supports this module as of Prince 11.1.
CSS Cascading and Inheritance Level 4	Prince supports the new `supports()` condition for the `@import` rule.
CSS Backgrounds and Borders Module Level 4	Prince recognizes the `border-clip` property, but takes a different syntax.
CSS Images Module Level 4 - Editor's Draft	Prince recognizes `image-resolution`, but takes a different syntax.
CSS Custom Properties for Cascading Variables Module Level 1	Prince supports this module.
Living Standards
CSS Books	Prince supports target counters, footnote floats, bookmarks labels, levels and states, the `flow` property and the `string-set` property.
CSS Figures	Prince largely supports the float extensions of the spec.
SVG
SVG 1.1	Prince supports the specification with some exceptions - please see Scalable Vector Graphics (SVG) for a full list of currently not supported elements.

CSS Support

Miscellaneous