allow clipboard access from the embed app

Author: pipopotamasu

src/iframe/iframe.spec.ts

@@ -28,4 +28,11 @@ describe("iframe util", () => {
       expect(iframe.style.height).toEqual("100%");
     });
   });
+
+  it("returns an iframe with the allow attribute set to clipboard-read and clipboard-write", () => {
+    return import("./iframe").then(({ createIframe }) => {
+      const iframe = createIframe(mockSrc) as HTMLIFrameElement;
+      expect(iframe.allow).toEqual("clipboard-read; clipboard-write");
+    });
+  });
 });

src/iframe/iframe.ts

@@ -5,6 +5,7 @@ const createIframe = (src: string): HTMLElement => {
   iframe.style.setProperty("width", "100%");
   iframe.style.setProperty("height", "100%");
   iframe.style.setProperty("border", "none");
+  iframe.allow = "clipboard-read; clipboard-write";
   iframe.src = src;
 
   return wrapWithLoader(iframe);