1 files changed, 15 insertions, 0 deletions
diff --git a/testing/web-platform/tests/html/browsers/browsing-the-web/back-forward-cache/resources/disable_bfcache.js b/testing/web-platform/tests/html/browsers/browsing-the-web/back-forward-cache/resources/disable_bfcache.js
new file mode 100644
index 0000000000..dea70ef4bd
--- /dev/null
+++ b/testing/web-platform/tests/html/browsers/browsing-the-web/back-forward-cache/resources/disable_bfcache.js
@@ -0,0 +1,15 @@
+// Try to disable BFCache by acquiring and never releasing a Web Lock.
+// This requires HTTPS.
+// Note: This is a workaround depending on non-specified WebLock+BFCache
+// behavior, and doesn't work on Safari. We might want to introduce a
+// test-only BFCache-disabling API instead in the future.
+// https://github.com/web-platform-tests/wpt/issues/16359#issuecomment-795004780
+// https://crbug.com/1298336
+window.disableBFCache = () => {
+  return new Promise(resolve => {
+    navigator.locks.request("disablebfcache", () => {
+      resolve();
+      return new Promise(() => {});
+    });
+  });
+};