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+# Compatibility Panel
+
+## Related files
+The compatibility panel consists of the following files:
+* Client:
+ * Main: `devtools/client/inspector/compatibility/`
+ * Style: `devtools/client/themes/compatibility.css`
+* Shared:
+ * MDN compatibility dataset: `devtools/shared/compatibility/dataset/`
+ * MDN compatibility library: `devtools/server/actors/compatibility/lib/MDNCompatibility.js`
+ * User setting file - `devtools/shared/compatibility/compatibility-user-settings.js`
+* Server:
+ * Actor: `devtools/server/actors/compatibility.js`
+ * Front: `devtools/client/fronts/compatibility.js`
+ * Spec: `devtools/shared/specs/compatibility.js`
+
+## MDN Compatibility Data
+The Compatibility panel detects issues by comparing against official [MDN compatibility data](https://github.com/mdn/browser-compat-data). It uses a local snapshot of the dataset. This dataset needs to be manually synchronized periodically to `devtools/shared/compatibility/dataset` (ideally with every Firefox release).
+
+To update this dataset, please refer to the guidelines in `devtools/shared/compatibility/README.md`
+
+## Tests
+* Client: `devtools/client/inspector/compatibility/test`
+* MDN compatibility library: `devtools/server/actors/compatibility/lib/test`
+* Server: `devtools/server/tests/browser/browser_compatibility_cssIssues.js`