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Order in which to append Readium CSS reflowable stylesheets

[Implementers’ doc] [Authors’ info]

Readium CSS is leveraging the cascade in order to provide authors with defaults, paginate contents and apply user overrides and themes. As a consequence, there is a specific order in which reflowable stylesheets must be added. Indeed, conformance with CSS Cascading and Inheritance Level 3 requires that we make authors’ stylesheets an integral part of our cascade.

Dist stylesheets

Inject ReadiumCSS dist stylesheets into the <head> of (X)HTML documents.

  1. ReadiumCSS-before.css
  2. Authors’ stylesheet(s) or ReadiumCSS-default.css for unstyled publications
  3. ReadiumCSS-after.css

For RTL, you would then have to load the stylesheets in the rtl folder. Same for CJK. Check the “Internationalization” doc for guidance.

By default, we inject all stylesheets on load and rely on custom properties (a.k.a. CSS variables) set on html to apply user settings.

Src modules

If you want to customize dist stylesheets, you’ll have to respect the following guidelines and rebuild dist stylesheets.

Insert before the author’s stylesheets

The following modules must be inserted before the author’s stylesheets (ReadiumCSS-before.css), in this exact order:

  1. ReadiumCSS-config.css
  2. ReadiumCSS-base.css
  3. ReadiumCSS-day_mode.css
  4. ReadiumCSS-fonts.css
  5. ReadiumCSS-html5patch.css
  6. ReadiumCSS-safeguards.css (or ReadiumCSS-safeguards-vertical.css for CJK – vertical writing mode)

Append if there is no author’s styles

The following modules must be appended if there is no external stylesheet (<link>), internal stylesheet (<style>) or inline styles in the document (style=" "), in this exact order:

  1. ReadiumCSS-default.css

This default must be appended before all other modules in the next section.

Append after the author’s stylesheets

The following modules must be appended after the author’s stylesheets (ReadiumCSS-after.css), ideally in this order:

  1. ReadiumCSS-config.css
  2. ReadiumCSS-pagination.css (or ReadiumCSS-pagination-vertical.css for CJK – vertical writing mode)
  3. ReadiumCSS-scroll.css (or ReadiumCSS-scroll-vertical.css for CJK – vertical writing mode)
  4. ReadiumCSS-night_mode.css
  5. ReadiumCSS-sepia_mode.css
  6. ReadiumCSS-os_a11y.css
  7. User settings:
    1. ReadiumCSS-colNumber_pref.css (does not apply to CJK – vertical writing mode)
    2. ReadiumCSS-lineLength_pref.css (or ReadiumCSS-lineLength-vertical_pref.css for CJK – vertical writing mode)
    3. ReadiumCSS-customColors_pref.css
    4. ReadiumCSS-textAlign_pref.css (does not apply to CJK scripts)
    5. ReadiumCSS-bodyHyphens_pref.css (does not apply to CJK scripts)
    6. ReadiumCSS-fontFamily_pref.css
    7. ReadiumCSS-a11yFont_pref.css (does not apply to RTL and CJK scripts)
    8. ReadiumCSS-fontSize_pref.css
    9. ReadiumCSS-lineHeight_pref.css
    10. ReadiumCSS-paraSpacing_pref.css (or ReadiumCSS-paraSpacing-vertical_pref.css for CJK – vertical writing mode)
    11. ReadiumCSS-paraIndent_pref.css (does not apply to CJK scripts)
    12. ReadiumCSS-wordSpacing_pref.css (does not apply to RTL and CJK scripts)
    13. ReadiumCSS-letterSpacing_pref.css (does not apply to RTL scripts, except in vertical writing mode)
    14. ReadiumCSS-arabicLigatures_pref.css (RTL only)
    15. ReadiumCSS-variableFont_pref.css (this contains optical sizing, weight and width prefs)
    16. ReadiumCSS-ruby_pref.css (CJK only)
  8. ReadiumCSS-fs_normalize.css