Fix navigation when the page contains an iframe with an empty name

src/observers/form_submit_observer.ts

@@ -60,6 +60,10 @@ function submissionDoesNotDismissDialog(form: HTMLFormElement, submitter?: HTMLE
 function submissionDoesNotTargetIFrame(form: HTMLFormElement, submitter?: HTMLElement): boolean {
   const target = submitter?.getAttribute("formtarget") || form.target
 
+  if (target === "") {
+    return true
+  }
+
   for (const element of document.getElementsByName(target)) {
     if (element instanceof HTMLIFrameElement) return false
   }

src/observers/link_click_observer.ts

@@ -72,6 +72,10 @@ export class LinkClickObserver {
 }
 
 function doesNotTargetIFrame(anchor: HTMLAnchorElement): boolean {
+  if (anchor.target === "") {
+    return true
+  }
+
   for (const element of document.getElementsByName(anchor.target)) {
     if (element instanceof HTMLIFrameElement) return false
   }

src/tests/fixtures/form.html

@@ -330,5 +330,6 @@ <h2>Frame: Form</h2>
       <button id="submit-external-target-ignored">POST to https://httpbin.org/post targeting #hello</button>
     </form>
     <iframe name="iframe"></iframe>
+    <iframe name></iframe>
   </body>
 </html>

src/tests/fixtures/navigation.html

@@ -75,5 +75,6 @@ <h1>Navigation</h1>
     <turbo-frame id="hello" disabled></turbo-frame>
 
     <iframe name="iframe"></iframe>
+    <iframe name></iframe>
   </body>
 </html>