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-rw-r--r--testing/web-platform/tests/FileAPI/support/historical-serviceworker.js5
1 files changed, 5 insertions, 0 deletions
diff --git a/testing/web-platform/tests/FileAPI/support/historical-serviceworker.js b/testing/web-platform/tests/FileAPI/support/historical-serviceworker.js
new file mode 100644
index 0000000000..8bd89a23ad
--- /dev/null
+++ b/testing/web-platform/tests/FileAPI/support/historical-serviceworker.js
@@ -0,0 +1,5 @@
+importScripts('/resources/testharness.js');
+
+test(() => {
+ assert_false('FileReaderSync' in self);
+}, '"FileReaderSync" should not be supported in service workers');