diff --git a/src/tests_basic/resources/publisher/index.html b/src/tests_basic/resources/publisher/index.html
index c2a1f81..9082ca7 100644
--- a/src/tests_basic/resources/publisher/index.html
+++ b/src/tests_basic/resources/publisher/index.html
@@ -21,7 +21,8 @@ <h1>run ad auction</h1>
       'https://localhost:8081': {
         contextualBidRequestId: 'abc'
       }
-    }
+    },
+    resolveToConfig: true,
   });
   console.log("winning url " + ar);
   const adDiv = document.getElementById('ad');
@@ -30,8 +31,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }
@@ -49,4 +49,4 @@ <h1>Hello!</h1>
 
 
 </body>
-</html>
\ No newline at end of file
+</html>
diff --git a/src/tests_daily_update/resources/seller/index.html b/src/tests_daily_update/resources/seller/index.html
index ec7043a..8a2c5aa 100644
--- a/src/tests_daily_update/resources/seller/index.html
+++ b/src/tests_daily_update/resources/seller/index.html
@@ -16,6 +16,7 @@ <h1>run ad auction</h1>
     auctionSignals: {key: "auction signals"},
     sellerSignals: {key: "seller signals"},
     perBuyerSignals: {"https://localhost:8201": {key: "tc signals"}},
+    resolveToConfig: true,
   });
 
   console.log("winning url " + ar);
@@ -25,8 +26,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }
diff --git a/src/tests_debugging_api/resources/seller/index.html b/src/tests_debugging_api/resources/seller/index.html
index 79b9f67..8da1740 100644
--- a/src/tests_debugging_api/resources/seller/index.html
+++ b/src/tests_debugging_api/resources/seller/index.html
@@ -15,6 +15,7 @@ <h1>run ad auction</h1>
     seller: seller_address,
     decisionLogicUrl: seller_address + '/seller.js',
     interestGroupBuyers: [buyer_address],
+    resolveToConfig: true,
   });
 
   console.log("winning url " + ar);
@@ -24,8 +25,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }
diff --git a/src/tests_functional/resources/seller/index.html b/src/tests_functional/resources/seller/index.html
index 5c3cf63..de9ccc9 100644
--- a/src/tests_functional/resources/seller/index.html
+++ b/src/tests_functional/resources/seller/index.html
@@ -16,6 +16,7 @@ <h1>run ad auction</h1>
     auctionSignals: {key: "auction signals"},
     sellerSignals: {key: "seller signals"},
     perBuyerSignals: {"https://localhost:8091": {key: "tc signals"}},
+    resolveToConfig: true,
   });
 
   console.log("winning url " + ar);
@@ -25,8 +26,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }
diff --git a/src/tests_performance/resources/seller/index.html b/src/tests_performance/resources/seller/index.html
index 601f024..1c4d791 100644
--- a/src/tests_performance/resources/seller/index.html
+++ b/src/tests_performance/resources/seller/index.html
@@ -17,6 +17,7 @@ <h1>run ad auction</h1>
     auctionSignals: {key: "auction signals"},
     sellerSignals: {key: "seller signals"},
     perBuyerSignals: {"https://localhost:9011": {key: "tc signals"}},
+    resolveToConfig: true,
   });
 
   console.log("winning url " + ar);
@@ -26,8 +27,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }
diff --git a/src/tests_prevwins/resources/seller/index.html b/src/tests_prevwins/resources/seller/index.html
index 79b9f67..8da1740 100644
--- a/src/tests_prevwins/resources/seller/index.html
+++ b/src/tests_prevwins/resources/seller/index.html
@@ -15,6 +15,7 @@ <h1>run ad auction</h1>
     seller: seller_address,
     decisionLogicUrl: seller_address + '/seller.js',
     interestGroupBuyers: [buyer_address],
+    resolveToConfig: true,
   });
 
   console.log("winning url " + ar);
@@ -24,8 +25,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }
diff --git a/src/tests_reportbid/resources/seller/index.html b/src/tests_reportbid/resources/seller/index.html
index 79b9f67..8da1740 100644
--- a/src/tests_reportbid/resources/seller/index.html
+++ b/src/tests_reportbid/resources/seller/index.html
@@ -15,6 +15,7 @@ <h1>run ad auction</h1>
     seller: seller_address,
     decisionLogicUrl: seller_address + '/seller.js',
     interestGroupBuyers: [buyer_address],
+    resolveToConfig: true,
   });
 
   console.log("winning url " + ar);
@@ -24,8 +25,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }
diff --git a/src/tests_trusted_bidding_signals/resources/seller/index.html b/src/tests_trusted_bidding_signals/resources/seller/index.html
index 2722b61..af5d5d2 100644
--- a/src/tests_trusted_bidding_signals/resources/seller/index.html
+++ b/src/tests_trusted_bidding_signals/resources/seller/index.html
@@ -17,6 +17,7 @@ <h1>run ad auction</h1>
     auctionSignals: {key: "auction signals"},
     sellerSignals: {key: "seller signals"},
     perBuyerSignals: {"https://localhost:8101": {key: "tc signals"}},
+    resolveToConfig: true,
   });
 
   console.log("winning url " + ar);
@@ -26,8 +27,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }
diff --git a/src/tests_webassembly/resources/seller/index.html b/src/tests_webassembly/resources/seller/index.html
index d602205..51139bc 100644
--- a/src/tests_webassembly/resources/seller/index.html
+++ b/src/tests_webassembly/resources/seller/index.html
@@ -16,6 +16,7 @@ <h1>run ad auction</h1>
     auctionSignals: {key: "auction signals"},
     sellerSignals: {key: "seller signals"},
     perBuyerSignals: {"https://localhost:9021": {key: "tc signals"}},
+    resolveToConfig: true,
   });
 
   console.log("winning url " + ar);
@@ -25,8 +26,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }
diff --git a/src/tests_webassembly_api/resources/seller/index.html b/src/tests_webassembly_api/resources/seller/index.html
index c55a469..e8447a5 100644
--- a/src/tests_webassembly_api/resources/seller/index.html
+++ b/src/tests_webassembly_api/resources/seller/index.html
@@ -16,6 +16,7 @@ <h1>run ad auction</h1>
     auctionSignals: {key: "auction signals"},
     sellerSignals: {key: "seller signals"},
     perBuyerSignals: {"https://localhost:9031": {key: "tc signals"}},
+    resolveToConfig: true,
   });
 
   console.log("winning url " + ar);
@@ -25,8 +26,7 @@ <h1>run ad auction</h1>
     adDiv.appendChild(document.createTextNode("No turtledove winner"));
   } else {
     const fframe = document.createElement('fencedframe');
-    fframe.setAttribute('mode', 'opaque-ads');
-    fframe.setAttribute('src', ar);
+    fframe.config = ar;
     fframe.setAttribute('style', 'width: 100px; height: 100px');
     adDiv.appendChild(fframe);
   }