diff --git a/api/@internal/component/ets/web.d.ts b/api/@internal/component/ets/web.d.ts
index e7a386923bdcd7ce8316eff3b403124aa5d3a93b..c810c7c410fedadda0798d5d3393a58926b9222f 100644
--- a/api/@internal/component/ets/web.d.ts
+++ b/api/@internal/component/ets/web.d.ts
@@ -10278,6 +10278,16 @@ declare interface SslErrorEvent {
    * @since 12
    */
   isMainFrame: boolean;
+
+  /**
+   * Certificate chain data in DER format.
+   *
+   * @type { ?Array<Uint8Array> }
+   * @syscap SystemCapability.Web.Webview.Core
+   * @since 20
+   * @arkts 1.1&1.2
+   */
+  certChainData?: Array<Uint8Array>;
 }
 
 /**