Context:

• Playwright Version: 0.13.0
• Operating System: Mac

Code Snippet

it('should work', async () => {
  console.log('goto');
  await page.goto(
    'https://journal.cnishina.dev/2020/04/create-mp4-from-screencast.html');
  await new Promise((resolve) => {
    setTimeout(resolve, 500);
  });
  console.log('click journal');
  await page.click('a[href="https://journal.cnishina.dev/"]');
  console.log('youtube');
  await page.click('a[href="https://youtu.be/dQw4w9WgXcQ"]');
});

Describe the bug

As a person writing a test, if I click on a link that navigates me away from the page, then it should not throw an error. I noticed this when I was clicking the a[href="https://youtu.be/dQw4w9WgXcQ"]. Clicking on this throws an error. I am either looking for documentation explaining targetId and sessionId and why this does not work when this happens (what the workflow should be if we decide to click on a link navigating us away from the main page) or to fix it with:

removeFrameSession(targetId) {
    const frameSession = this._sessions.get(targetId);
    if (!frameSession)
        return;
    // Frame id equals target id.
    const frame = this._page._frameManager.frame(targetId);
    if (frame) {
        this._page._frameManager.removeChildFramesRecursively(frame);
        frameSession.dispose();
        this._sessions.delete(targetId);
    }
}

This just changes the assert(frame); and puts it into a conditional. I've tried out this change and it appears to work but might not be the right fix. Let me know and I can put in a PR this week. Thanks!