diff --git a/testing/web-platform/tests/.gitignore b/testing/web-platform/tests/.gitignore
index 0f080ca986bc..60d06876d962 100644
--- a/testing/web-platform/tests/.gitignore
+++ b/testing/web-platform/tests/.gitignore
@@ -47,3 +47,6 @@ scratch
 /css/dist_last
 /css/tools/cache
 /webaudio/idl/*
+
+# w3c-test.org PR-branch mirroring
+submissions/
diff --git a/testing/web-platform/tests/lint.whitelist b/testing/web-platform/tests/lint.whitelist
index c254fef4e0dd..2d9254d4b321 100644
--- a/testing/web-platform/tests/lint.whitelist
+++ b/testing/web-platform/tests/lint.whitelist
@@ -64,6 +64,9 @@ TRAILING WHITESPACE, INDENT TABS, CR AT EOL: *.sxg
 
 TRAILING WHITESPACE: xhr/resources/headers-some-are-empty.asis
 
+## .gitignore
+W3C-TEST.ORG: .gitignore
+
 ## Documentation ##
 
 W3C-TEST.ORG: README.md