readium · JayPanoz · May 13, 2026 · May 13, 2026 · May 13, 2026 · May 13, 2026
diff --git a/.github/workflows/playwright.yml b/.github/workflows/playwright.yml
@@ -3,8 +3,14 @@ name: Playwright Visual Regression
 on:
   push:
     branches: ["develop"]
+    paths:
+      - "css/src/**"
+      - "css/vars/**"
   pull_request:
     branches: ["develop"]
+    paths:
+      - "css/src/**"
+      - "css/vars/**"
 
 jobs:
   test:

diff --git a/css/dist/ReadiumCSS-after.css b/css/dist/ReadiumCSS-after.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.

diff --git a/css/dist/ReadiumCSS-before.css b/css/dist/ReadiumCSS-before.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.
@@ -144,11 +144,11 @@
 
   --RS__am-baseFontFamily:Kefa, Nyala, Roboto, Noto, 'Noto Sans Ethiopic', serif;
 
-  --RS__default-lineHeightCompensation:1;
+  --RS__latin-lineHeightCompensation:1;
 
-  --RS__default-baseFontFamily:var(--RS__oldStyleTf);
-  --RS__baseFontFamily:var(--RS__default-baseFontFamily);
-  --RS__lineHeightCompensation:var(--RS__default-lineHeightCompensation);
+  --RS__latin-baseFontFamily:var(--RS__oldStyleTf);
+  --RS__baseFontFamily:var(--RS__latin-baseFontFamily);
+  --RS__lineHeightCompensation:var(--RS__latin-lineHeightCompensation);
   --RS__baseLineHeight:calc(1.5 * var(--RS__lineHeightCompensation));
 
   --RS__selectionTextColor:inherit;

diff --git a/css/dist/ReadiumCSS-default.css b/css/dist/ReadiumCSS-default.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.

diff --git a/css/dist/cjk-horizontal/ReadiumCSS-after.css b/css/dist/cjk-horizontal/ReadiumCSS-after.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.

diff --git a/css/dist/cjk-horizontal/ReadiumCSS-before.css b/css/dist/cjk-horizontal/ReadiumCSS-before.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.
@@ -144,11 +144,11 @@
 
   --RS__am-baseFontFamily:Kefa, Nyala, Roboto, Noto, 'Noto Sans Ethiopic', serif;
 
-  --RS__default-lineHeightCompensation:1;
+  --RS__latin-lineHeightCompensation:1;
 
-  --RS__default-baseFontFamily:var(--RS__oldStyleTf);
-  --RS__baseFontFamily:var(--RS__default-baseFontFamily);
-  --RS__lineHeightCompensation:var(--RS__default-lineHeightCompensation);
+  --RS__latin-baseFontFamily:var(--RS__oldStyleTf);
+  --RS__baseFontFamily:var(--RS__latin-baseFontFamily);
+  --RS__lineHeightCompensation:var(--RS__latin-lineHeightCompensation);
   --RS__baseLineHeight:calc(1.5 * var(--RS__lineHeightCompensation));
 
   --RS__selectionTextColor:inherit;

diff --git a/css/dist/cjk-horizontal/ReadiumCSS-default.css b/css/dist/cjk-horizontal/ReadiumCSS-default.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.

diff --git a/css/dist/cjk-vertical/ReadiumCSS-after.css b/css/dist/cjk-vertical/ReadiumCSS-after.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.

diff --git a/css/dist/cjk-vertical/ReadiumCSS-before.css b/css/dist/cjk-vertical/ReadiumCSS-before.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.
@@ -144,11 +144,11 @@
 
   --RS__am-baseFontFamily:Kefa, Nyala, Roboto, Noto, 'Noto Sans Ethiopic', serif;
 
-  --RS__default-lineHeightCompensation:1;
+  --RS__latin-lineHeightCompensation:1;
 
-  --RS__default-baseFontFamily:var(--RS__oldStyleTf);
-  --RS__baseFontFamily:var(--RS__default-baseFontFamily);
-  --RS__lineHeightCompensation:var(--RS__default-lineHeightCompensation);
+  --RS__latin-baseFontFamily:var(--RS__oldStyleTf);
+  --RS__baseFontFamily:var(--RS__latin-baseFontFamily);
+  --RS__lineHeightCompensation:var(--RS__latin-lineHeightCompensation);
   --RS__baseLineHeight:calc(1.5 * var(--RS__lineHeightCompensation));
 
   --RS__selectionTextColor:inherit;

diff --git a/css/dist/cjk-vertical/ReadiumCSS-default.css b/css/dist/cjk-vertical/ReadiumCSS-default.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.

diff --git a/css/dist/rtl/ReadiumCSS-after.css b/css/dist/rtl/ReadiumCSS-after.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.

diff --git a/css/dist/rtl/ReadiumCSS-before.css b/css/dist/rtl/ReadiumCSS-before.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.
@@ -144,11 +144,11 @@
 
   --RS__am-baseFontFamily:Kefa, Nyala, Roboto, Noto, 'Noto Sans Ethiopic', serif;
 
-  --RS__default-lineHeightCompensation:1;
+  --RS__latin-lineHeightCompensation:1;
 
-  --RS__default-baseFontFamily:var(--RS__oldStyleTf);
-  --RS__baseFontFamily:var(--RS__default-baseFontFamily);
-  --RS__lineHeightCompensation:var(--RS__default-lineHeightCompensation);
+  --RS__latin-baseFontFamily:var(--RS__oldStyleTf);
+  --RS__baseFontFamily:var(--RS__latin-baseFontFamily);
+  --RS__lineHeightCompensation:var(--RS__latin-lineHeightCompensation);
   --RS__baseLineHeight:calc(1.5 * var(--RS__lineHeightCompensation));
 
   --RS__selectionTextColor:inherit;

diff --git a/css/dist/rtl/ReadiumCSS-default.css b/css/dist/rtl/ReadiumCSS-default.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.

diff --git a/css/dist/webPub/ReadiumCSS-webPub.css b/css/dist/webPub/ReadiumCSS-webPub.css
@@ -1,5 +1,5 @@
 /*!
- * Readium CSS v.2.0.4
+ * Readium CSS v.2.0.5
  * Copyright (c) 2017–2026. Readium Foundation. All rights reserved.
  * Use of this source code is governed by a BSD-style license which is detailed in the
  * LICENSE file present in the project repository where this source code is maintained.

diff --git a/css/src/modules/ReadiumCSS-base.css b/css/src/modules/ReadiumCSS-base.css
@@ -23,10 +23,10 @@
   @import-json "../../vars/i18n.json";
 
   /* Config */
-  --RS__baseFontFamily: var(--RS__default-baseFontFamily);
+  --RS__baseFontFamily: var(--RS__latin-baseFontFamily);
 
   /* For square-ish fonts (CJK, Indic, etc.), we must apply some compensation in leading. Default is 1 i.e. no compensation */
-  --RS__lineHeightCompensation: var(--RS__default-lineHeightCompensation);
+  --RS__lineHeightCompensation: var(--RS__latin-lineHeightCompensation);
   --RS__baseLineHeight: calc(1.5 * var(--RS__lineHeightCompensation));
 
   /* Default colors (previously implemented as day mode) */

diff --git a/css/vars/CSS-Variables.md b/css/vars/CSS-Variables.md
@@ -42,11 +42,11 @@
 
 1. Find the key matching the publication's full BCP-47 language tag.
 2. If no match, strip the region subtag and try again.
-3. If no match, use `default` (or ignore, because the line-height compensation should be `1`).
+3. If no match, use `latin` (or ignore, because the line-height compensation should be `1`).
 
 | Language | Base Font Family | Line Height Compensation |
 | --- | --- | --- |
-| `default` | `var(--RS__oldStyleTf)` | `1` |
+| `latin` | `var(--RS__oldStyleTf)` | `1` |
 | `am` | `Kefa, Nyala, Roboto, Noto, 'Noto Sans Ethiopic', serif` | `1.167` |
 | `ar` | `'Geeza Pro', 'Arabic Typesetting', Roboto, Noto, 'Noto Naskh Arabic', 'Times New Roman', serif` | — |
 | `bn` | `'Kohinoor Bangla', 'Bangla Sangam MN', Vrinda, Roboto, Noto, 'Noto Sans Bengali', sans-serif` | `1.067` |
@@ -81,7 +81,7 @@ User settings vary by stylesheet variant. Each name below maps to a `--USER__` C
 
 | Variant | Disabled | Added |
 | --- | --- | --- |
-| `default` | — | — |
+| `ltr` | — | — |
 | `rtl` | `--USER__bodyHyphens`, `--USER__a11yNormalize`, `--USER__letterSpacing` | — |
 | `cjk-horizontal` | `--USER__textAlign`, `--USER__bodyHyphens`, `--USER__a11yNormalize`, `--USER__ligatures`, `--USER__paraIndent`, `--USER__wordSpacing` | `--USER__noRuby` |
 | `cjk-vertical` | `--USER__colCount`, `--USER__textAlign`, `--USER__bodyHyphens`, `--USER__a11yNormalize`, `--USER__ligatures`, `--USER__paraIndent`, `--USER__wordSpacing` | `--USER__noRuby` |

diff --git a/css/vars/i18n.json b/css/vars/i18n.json
@@ -1,5 +1,5 @@
 {
-  "default": {
+  "latin": {
     "baseFontFamily": "var(--RS__oldStyleTf)",
     "lineHeightCompensation": 1
   },

diff --git a/css/vars/settings.json b/css/vars/settings.json
@@ -1,5 +1,5 @@
 {
-  "default": {
+  "ltr": {
     "disabled": [],
     "added": []
   },

diff --git a/docs/CSS28-migration_guide.md b/docs/CSS28-migration_guide.md
@@ -284,7 +284,7 @@ The custom property has been kept so that consumers of ReadiumCSS can still cust
 
 ## Exposition of i18n stacks and compensation
 
-As of version `2.0.3`, font-stacks and line-height compensation are exposed for languages e.g. `am`, `ja`, `zh`, etc. so that host apps can import the JSON and consume the data. `default` (Latin) is our reference for all other scripts, and can also be used as a fallback when using the map.
+As of version `2.0.5`, font-stacks and line-height compensation are exposed for languages e.g. `am`, `ja`, `zh`, etc. so that host apps can import the JSON and consume the data. `latin` (previously `default` from `2.0.3`) is our reference for all other scripts, and can also be used as a fallback when using the map.
 
 A markdown document with tables generated from the JSON files in `vars` has also been added. 
 

diff --git a/docs/ReadiumCSS_docs.epub b/docs/ReadiumCSS_docs.epub
diff --git a/docs/ReadiumCSS_docs/OEBPS/Text/Section-028.xhtml b/docs/ReadiumCSS_docs/OEBPS/Text/Section-028.xhtml
@@ -342,7 +342,7 @@ const backgroundColor = defaultColors.RS__backgroundColor;</code></pre>
     <section id="i18n-stacks-exposition" class="level2">
       <h2 id="sigil_toc_id_226">Exposition of i18n stacks and compensation</h2>
 
-      <p>As of version <code>2.0.3</code>, font-stacks and line-height compensation are exposed for languages e.g. <code>am</code>, <code>ja</code>, <code>zh</code>, etc. so that host apps can import the JSON and consume the data. <code>default</code> (Latin) is our reference for all other scripts, and can also be used as a fallback when using the map.</p>
+      <p>As of version <code>2.0.5</code>, font-stacks and line-height compensation are exposed for languages e.g. <code>am</code>, <code>ja</code>, <code>zh</code>, etc. so that host apps can import the JSON and consume the data. <code>latin</code> (previously <code>default</code> from <code>2.0.3</code>) is our reference for all other scripts, and can also be used as a fallback when using the map.</p>
 
       <p>A markdown document with tables generated from the JSON files in <code>vars</code> has also been added.</p>
     </section>

diff --git a/package.json b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@readium/css",
   "description": "A set of reference stylesheets for EPUB Reading Systems",
-  "version": "2.0.4",
+  "version": "2.0.5",
   "homepage": "https://github.com/readium/css",
   "license": "BSD-3-Clause",
   "keywords": [

diff --git a/scripts/generate-vars-doc.js b/scripts/generate-vars-doc.js
@@ -26,7 +26,7 @@ const I18N_STRATEGY = `\
 
 1. Find the key matching the publication's full BCP-47 language tag.
 2. If no match, strip the region subtag and try again.
-3. If no match, use \`default\` (or ignore, because the line-height compensation should be \`1\`).
+3. If no match, use \`latin\` (or ignore, because the line-height compensation should be \`1\`).
 
 `;