diff --git a/testing/web-platform/tests/interfaces/storage-buckets.tentative.idl b/testing/web-platform/tests/interfaces/storage-buckets.tentative.idl
new file mode 100644
index 0000000000000..d5a26cce6ed9b
--- /dev/null
+++ b/testing/web-platform/tests/interfaces/storage-buckets.tentative.idl
@@ -0,0 +1,168 @@
+[
+Exposed
+=
+(
+Window
+Worker
+)
+SecureContext
+]
+interface
+BucketManager
+{
+Promise
+<
+StorageBucket
+>
+open
+(
+DOMString
+name
+optional
+StorageBucketOptions
+options
+=
+{
+}
+)
+;
+Promise
+<
+sequence
+<
+DOMString
+>
+>
+keys
+(
+)
+;
+Promise
+<
+undefined
+>
+delete
+(
+DOMString
+name
+)
+;
+}
+;
+dictionary
+StorageBucketOptions
+{
+DOMString
+?
+title
+=
+null
+;
+boolean
+persisted
+=
+false
+;
+StorageBucketDurability
+durability
+=
+"
+relaxed
+"
+;
+unsigned
+long
+long
+?
+quota
+=
+null
+;
+DOMTimeStamp
+?
+expires
+=
+null
+;
+}
+;
+enum
+StorageBucketDurability
+{
+"
+strict
+"
+"
+relaxed
+"
+}
+;
+[
+Exposed
+=
+(
+Window
+Worker
+)
+SecureContext
+]
+interface
+StorageBucket
+{
+[
+Exposed
+=
+Window
+]
+Promise
+<
+boolean
+>
+persist
+(
+)
+;
+Promise
+<
+boolean
+>
+persisted
+(
+)
+;
+Promise
+<
+StorageEstimate
+>
+estimate
+(
+)
+;
+Promise
+<
+StorageBucketDurability
+>
+durability
+(
+)
+;
+Promise
+<
+undefined
+>
+setExpires
+(
+DOMTimeStamp
+expires
+)
+;
+Promise
+<
+DOMTimeStamp
+>
+expires
+(
+)
+;
+}
+;