Release Font Tools 0.2.0

public/CHANGELOG.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## 0.2.0 - 2026-09-02
+
+- Add local WOFF2 decompression, GSUB/GPOS inventories and a browser-backed
+  OpenType shaping comparison lab.
+- Add bounded TTC/OTC 1.0/2.0 validation, per-face selection, isolated
+  standalone-face preview reconstruction and explicit collection export/subset
+  limits.
+- Reject reserved WOFF2 table-transform versions before the third-party decoder
+  receives the input.
+
 ## 0.1.0 - 2026-09-01
 
 - Add bounded TTF/OTF/WOFF inspection in an isolated worker.

public/LICENSES/npm-runtime-licenses.txt

@@ -1,5 +1,5 @@
 ==============================================================================
-@add-ideas/toolbox-contract@0.2.3
+@add-ideas/toolbox-contract@0.3.0
 Declared licence: Apache-2.0
 ==============================================================================
 --- LICENSE ---
@@ -196,9 +196,8 @@ Declared licence: Apache-2.0
       See the License for the specific language governing permissions and
       limitations under the License.
 
-
 ==============================================================================
-@add-ideas/toolbox-helpers@0.1.0
+@add-ideas/toolbox-helpers@0.2.0
 Declared licence: GPL-3.0-or-later
 ==============================================================================
 --- LICENSE ---
@@ -877,9 +876,8 @@ the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <https://www.gnu.org/licenses/why-not-lgpl.html>.
 
-
 ==============================================================================
-@add-ideas/toolbox-shell-react@0.2.3
+@add-ideas/toolbox-shell-react@0.3.0
 Declared licence: Apache-2.0
 ==============================================================================
 --- LICENSE ---
@@ -1076,6 +1074,308 @@ Declared licence: Apache-2.0
       See the License for the specific language governing permissions and
       limitations under the License.
 
+==============================================================================
+@swc/helpers@0.5.23
+Declared licence: Apache-2.0
+==============================================================================
+--- LICENSE ---
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+limitations under the License.
+
+==============================================================================
+base64-js@1.5.1
+Declared licence: MIT
+==============================================================================
+--- LICENSE ---
+The MIT License (MIT)
+
+Copyright (c) 2014 Jameson Little
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+
+==============================================================================
+brotli@1.3.3
+Declared licence: MIT
+==============================================================================
+See upstream package metadata.
+
+==============================================================================
+clone@2.1.2
+Declared licence: MIT
+==============================================================================
+--- LICENSE ---
+Copyright © 2011-2015 Paul Vorbach <paul@vorba.ch>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the “Software”), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+==============================================================================
+dfa@1.2.0
+Declared licence: MIT
+==============================================================================
+See upstream package metadata.
+
+==============================================================================
+fast-deep-equal@3.1.3
+Declared licence: MIT
+==============================================================================
+--- LICENSE ---
+MIT License
+
+Copyright (c) 2017 Evgeny Poberezkin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+==============================================================================
+fontkit@2.0.4
+Declared licence: MIT
+==============================================================================
+See upstream package metadata.
 
 ==============================================================================
 opentype.js@2.0.0
@@ -1103,6 +1403,32 @@ COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
+==============================================================================
+pako@0.2.9
+Declared licence: MIT
+==============================================================================
+--- LICENSE ---
+(The MIT License)
+
+Copyright (C) 2014-2016 by Vitaly Puzrin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
 
 ==============================================================================
 react@19.2.8
@@ -1131,7 +1457,6 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
-
 ==============================================================================
 react-dom@19.2.8
 Declared licence: MIT
@@ -1159,6 +1484,32 @@ LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
 
+==============================================================================
+restructure@3.0.2
+Declared licence: MIT
+==============================================================================
+--- LICENSE ---
+MIT License
+
+Copyright (c) 2015-present Devon Govett
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
 
 ==============================================================================
 scheduler@0.27.0
@@ -1186,3 +1537,74 @@ AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 SOFTWARE.
+
+==============================================================================
+tiny-inflate@1.0.3
+Declared licence: MIT
+==============================================================================
+--- LICENSE ---
+MIT License
+
+Copyright (c) 2015-present Devon Govett
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
+==============================================================================
+tslib@2.8.1
+Declared licence: 0BSD
+==============================================================================
+--- LICENSE.txt ---
+Copyright (c) Microsoft Corporation.
+
+Permission to use, copy, modify, and/or distribute this software for any
+purpose with or without fee is hereby granted.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+PERFORMANCE OF THIS SOFTWARE.
+
+==============================================================================
+unicode-properties@1.4.1
+Declared licence: MIT
+==============================================================================
+--- LICENSE ---
+Copyright 2018
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+==============================================================================
+unicode-trie@2.0.0
+Declared licence: MIT
+==============================================================================
+--- LICENSE ---
+Copyright 2018
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

public/README.md

@@ -1,19 +1,36 @@
 # Font Tools
 
 Font Tools is a GPL-3.0-or-later, local-first browser workbench for inspecting
-TTF, OTF and WOFF fonts. It inventories SFNT tables, names, metrics, Unicode
-coverage, variable axes and OS/2 embedding restrictions; previews arbitrary
-text against local fallbacks; generates inert CSS; and can rebuild a deliberately
-simple static outline subset when the machine-readable restrictions permit it.
+TTF, OTF, TTC, OTC, WOFF and WOFF2 fonts. It inventories SFNT and OpenType-layout
+tables, names, metrics, Unicode coverage, variable axes and OS/2 embedding
+restrictions; provides a browser shaping/comparison lab; generates inert CSS;
+and can rebuild a deliberately simple static outline subset when
+machine-readable restrictions permit it.
 
 Files never leave the browser. Parsing and subsetting run in a disposable worker
 with an 8-second operation limit. Preview rendering is contained in a scriptless
-sandboxed frame. WOFF2 is detected but not parsed in v0.1.0.
+sandboxed frame. WOFF2 inspection uses Fontkit's pinned browser build and local
+Brotli decoder under the strict no-`unsafe-eval` CSP; it never calls a
+conversion service. TTC/OTC 1.0 and 2.0 headers, up to 64 unique aligned face
+offsets, every selected SFNT directory and optional DSIG boundaries are
+validated before Fontkit exposes the face list. Selecting a face rebuilds a
+bounded standalone SFNT only for the sandboxed in-memory preview.
 
-Limits: 16 MiB input, 64 MiB declared expanded SFNT size, 128 tables, 65,535
-glyphs, 250,000 Unicode mappings, 20,000 preview characters and 1,024 subset
-glyphs. Suspicious WOFF ratios and invalid table bounds are rejected before the
-font library sees the data.
+WOFF2 and collection static subset export remain disabled until those paths can
+preserve the same source-metadata guarantees as the SFNT/WOFF writer. Font
+Tools does not export a selected collection face or rebuild TTC/OTC containers:
+shared tables, face ordering and DSIG data would require a dedicated
+round-trip-safe writer. Generated collection CSS uses `format("collection")`,
+but CSS cannot portably address the selected face by numeric index; verify
+family/style matching or deploy an authorized standalone face prepared by
+suitable tooling.
+
+Limits: 16 MiB input, 64 MiB declared or reconstructed SFNT size, 64 collection
+faces, 128 tables per face, 65,535 glyphs, 250,000 Unicode mappings, 20,000
+preview characters and 1,024 subset glyphs. Suspicious WOFF ratios, invalid
+WOFF2/TTC declarations and SFNT table bounds are rejected before the font
+library sees the data. Shaping comparisons use the browser engine and therefore
+reflect that browser rather than a portable HarfBuzz reference result.
 
 Run `npm ci`, then `npm run check`, `npm run test:browser`, and
 `npm run package:release -- --force`. Copyright © 2026 Albrecht Degering.

public/SOURCE.md

@@ -2,7 +2,7 @@
 
 - Repository: https://git.add-ideas.de/lotobo/font-tools
 - Application ID: `de.add-ideas.font-tools`
-- Version: `0.1.0`
+- Version: `0.2.0`
 - License: `GPL-3.0-or-later`
 
 The release ZIP is deterministically assembled from the production build and

public/THIRD_PARTY_NOTICES.md

@@ -1,5 +1,9 @@
 # Third-party notices
 
-Font Tools uses React, the add·ideas Toolbox packages, and opentype.js. The
-generated runtime-license inventory in `LICENSES/npm-runtime-licenses.txt`
-records package versions and license metadata. No third-party font is bundled.
+Font Tools uses React, add·ideas Toolbox Contract and Shell React 0.3.0
+(Apache-2.0), Toolbox Helpers 0.2.0 (GPL-3.0-or-later), opentype.js and the
+MIT-licensed Fontkit browser build for WOFF2 inspection. Fontkit's local Brotli
+decoder and transitive runtime licences are recorded by the generated inventory
+in `LICENSES/npm-runtime-licenses.txt`. The development-only `wawoff2` package
+creates project-authored WOFF2 test fixtures and is not bundled in production.
+No third-party font, network font or conversion service is used.

public/docs/ARCHITECTURE.md

@@ -1,12 +1,27 @@
 # Architecture
 
 `core/sfnt.ts` validates SFNT/WOFF headers and table boundaries before parsing.
-`font.worker.ts` owns the opentype.js instance and the source bytes; the UI only
-receives bounded serializable inspection records. Each load gets a new worker,
-and an unresponsive operation is terminated after eight seconds. Subsetting is
-a separate worker command that rebuilds a static outline font from requested
-Unicode glyphs only after OS/2 restrictions are checked.
+For TTC/OTC it accepts header versions 1.0 and 2.0, caps face count, validates
+the complete offset array, uniqueness/alignment, each face signature and SFNT
+directory, and the optional DSIG boundary. A selected face is reconstructed by
+copying its bounded tables into a standalone SFNT directory with rewritten
+offsets and checksum adjustment; those bytes exist only as a preview Blob and
+are never offered as a round-trip-safe export.
+For WOFF2 it validates the header, UIntBase128 directory, reconstructed SFNT
+size, transform declarations and compressed-stream bounds before Fontkit's
+browser build performs local Brotli/table decoding. This path needs neither
+WebAssembly nor dynamic evaluation and therefore remains compatible with the
+app's strict CSP. `font.worker.ts` owns the parser instance and source
+bytes; the UI receives only bounded serializable inspection records, collection
+face labels and the selected preview buffer, including variable axes and
+GSUB/GPOS script, feature and lookup inventories. Each load gets a new worker,
+and an unresponsive operation is terminated after eight seconds. Face switching
+reuses that worker and updates its coverage/report model atomically. Subsetting
+is a separate worker command that rebuilds a static outline font from requested
+Unicode glyphs only after OS/2 restrictions are checked; WOFF2, variable and
+collection sources are explicitly blocked.
 
-React keeps the last successful inspection after errors. Font rendering occurs
-in a scriptless sandboxed iframe. Relative assets and a same-origin service
+React keeps the last successful inspection after errors. Font rendering and the
+feature/language/direction comparison lab occur in a scriptless sandboxed iframe
+using the browser's shaping engine. Relative assets and a same-origin service
 worker support nested offline deployment.

public/docs/PRIVACY-SECURITY.md

@@ -6,6 +6,12 @@ downloads are the only output. Parsing uses strict size/table/expansion/glyph
 caps, a disposable worker and a deadline. User metadata is rendered as text;
 preview HTML is escaped and confined to a scriptless sandbox.
 
+Collection face selection keeps the original TTC/OTC in its disposable worker.
+Only the selected face is reconstructed into a bounded temporary Blob for the
+sandboxed preview; it is revoked on replacement and is not exposed as an export.
+TTC 2.0 DSIG boundaries are validated and reported, but signatures are not
+cryptographically verified.
+
 The OS/2 `fsType` field is technical metadata, not legal advice. Font Tools
 blocks subsetting when it declares restricted embedding, no-subsetting or
 bitmap-only embedding, but users must still comply with the actual licence.

public/sw.js

@@ -1,4 +1,4 @@
-const CACHE = "font-tools-v0.1.0",
+const CACHE = "font-tools-v0.2.0",
   APP = [
     "./",
     "./index.html",

public/toolbox-app.json

@@ -3,12 +3,22 @@
   "schemaVersion": 1,
   "id": "de.add-ideas.font-tools",
   "name": "Font Tools",
-  "version": "0.1.0",
-  "description": "Inspect and prepare fonts locally.",
+  "version": "0.2.0",
+  "description": "Inspect, compare and prepare fonts locally.",
   "entry": "./",
   "icon": "./favicon.svg",
   "categories": ["design", "developer"],
-  "tags": ["font", "ttf", "otf", "woff", "glyph", "typography", "subset"],
+  "tags": [
+    "font",
+    "ttf",
+    "otf",
+    "ttc",
+    "otc",
+    "woff",
+    "glyph",
+    "typography",
+    "subset"
+  ],
   "integration": {
     "contextVersion": 1,
     "launchModes": ["navigate", "new-tab"],
@@ -21,6 +31,22 @@
     "crossOriginIsolated": false,
     "topLevelContext": false
   },
+  "io": {
+    "accepts": [
+      { "mediaType": "font/ttf", "extensions": [".ttf"] },
+      { "mediaType": "font/otf", "extensions": [".otf"] },
+      { "mediaType": "font/collection", "extensions": [".ttc", ".otc"] },
+      { "mediaType": "font/woff", "extensions": [".woff"] },
+      { "mediaType": "font/woff2", "extensions": [".woff2"] }
+    ],
+    "produces": [
+      { "mediaType": "text/css", "extensions": [".css"] },
+      { "mediaType": "application/json", "extensions": [".json"] },
+      { "mediaType": "font/ttf", "extensions": [".ttf"] },
+      { "mediaType": "font/otf", "extensions": [".otf"] }
+    ]
+  },
+  "capabilities": { "required": ["workers"], "optional": [] },
   "privacy": {
     "processing": "local",
     "fileUploads": true,