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diff --git a/tests/rustdoc-gui/README.md b/tests/rustdoc-gui/README.md
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+The tests present here are used to test the generated HTML from rustdoc. The
+goal is to prevent unsound/unexpected GUI changes.
+
+This is using the [browser-ui-test] framework to do so. It works as follows:
+
+It wraps [puppeteer] to send commands to a web browser in order to navigate and
+test what's being currently displayed in the web page.
+
+You can find more information and its documentation in its [repository][browser-ui-test].
+
+If you need to have more information on the tests run, you can use `--test-args`:
+
+```bash
+$ ./x.py test src/test/rustdoc-gui --stage 1 --test-args --debug
+```
+
+If you don't want to run in headless mode (helpful to debug sometimes), you can use
+`--no-headless`:
+
+```bash
+$ ./x.py test src/test/rustdoc-gui --stage 1 --test-args --no-headless
+```
+
+To see the supported options, use `--help`.
+
+Important to be noted: if the chromium instance crashes when you run it, you might need to
+use `--no-sandbox` to make it work:
+
+```bash
+$ ./x.py test src/test/rustdoc-gui --stage 1 --test-args --no-sandbox
+```
+
+[browser-ui-test]: https://github.com/GuillaumeGomez/browser-UI-test/
+[puppeteer]: https://pptr.dev/