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diff --git a/doc/reference/testing.rst b/doc/reference/testing.rst
index 9196fd876c9..c1d9410bc4a 100644
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@@ -296,6 +296,14 @@ The web UI has many useful features: it can run only some submodules, or
filter tests that match a string. It can show every assertions, failed or passed,
rerun specific tests, ...
+.. warning::
+
+ While the test suite is running, make sure that:
+
+ - your browser window is focused,
+ - it is not zoomed in/out. It needs to have exactly 100% zoom level.
+
+ If this is not the case, some tests will fail, without a proper explanation.
Testing Infrastructure
----------------------