CSS References

In this section you find the documentation for supported CSS features.

CSS Features

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 does not support break-{before,after,inside}. However, Prince supports also the Prince-specific properties column-break-{before,after}. 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, but not hsl(). rgba() is supported in builds after Prince 11.

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, only font-stretch is recognized. However, Prince provides a different interface to the functionality of the font-variant-* and font-feature-settings properties.

CSS Generated Content for Paged Media Module Prince recognizes footnote-display and string-set. It does not recognize the running or footnote-policy properties, but Prince provides a different interface to the funcitonality of footnotes.

CSS Image Values and Replaced Content Module Level 3 Prince recognizes image-resolution, but takes a different syntax.

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

CSS Overflow Module Level 3 Prince only recognizes the overflow property from CSS 2.1. However, it supports its behaviour as described in the Level 3 module.

CSS Paged Media Module Level 3 Prince largely supports this module.

CSS Text Module Level 3 Prince does not recognize line-break, text-align-all and hanging-punctuation.

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 Prince supports the filter property.

CSS Level 4

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 supports the border-clip property.

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 does not support alignment-baseline, color-interpolation, color-profile, enable-background, glyph-orientation-horizontal, kerning, mask, pointer-events (barely applicable to Prince), font-size-adjust, glyph-orientation-vertical.

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 does not support `break-{before,after,inside}`. However, Prince supports also the Prince-specific properties `column-break-{before,after}`. 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, but not `hsl()`. `rgba()` is supported in builds after Prince 11.
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, only `font-stretch` is recognized. However, Prince provides a different interface to the functionality of the `font-variant-*` and `font-feature-settings` properties.
CSS Generated Content for Paged Media Module	Prince recognizes `footnote-display` and `string-set`. It does not recognize the `running` or `footnote-policy` properties, but Prince provides a different interface to the funcitonality of footnotes.
CSS Image Values and Replaced Content Module Level 3	Prince recognizes `image-resolution`, but takes a different syntax.
CSS Multi-column Layout Module	Prince largely supports this module.
CSS Overflow Module Level 3	Prince only recognizes the `overflow` property from CSS 2.1. However, it supports its behaviour as described in the Level 3 module.
CSS Paged Media Module Level 3	Prince largely supports this module.
CSS Text Module Level 3	Prince does not recognize `line-break`, `text-align-all` and `hanging-punctuation`.
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	Prince supports the `filter` property.
CSS Level 4
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 supports the `border-clip` property.
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 does not support `alignment-baseline`, `color-interpolation`, `color-profile`, `enable-background`, `glyph-orientation-horizontal`, `kerning`, `mask`, `pointer-events` (barely applicable to Prince), `font-size-adjust`, `glyph-orientation-vertical`.

The following sections may be relevant:

Length Units

Prince supports the following length units:

Absolute Length Units

The absolute length units correspond to exact distances in the PDF file.

Absolute length units

cm centimeters

mm millimeters

q quarter-millimeters

in inches

pc picas

pt points

Absolute length units
`cm`	centimeters
`mm`	millimeters
`q`	quarter-millimeters
`in`	inches
`pc`	picas
`pt`	points

Font Length Units

The font length units are relative to the font-size property.

Font length units

em font size of the element

rem font size of the root element

ex x-height of the element's font

Font length units
`em`	font size of the element
`rem`	font size of the root element
`ex`	x-height of the element's font

Pixel Unit

The pixel unit is relative to the de-facto standard of 96dpi (or rather, 96 pixel per inch) for compatibility with browsers.

Pixel unit

px pixel

Pixel unit
`px`	pixel