[BUG] iframe inside an iframe is not visible

[DoroNahari]

Context:

• Playwright Version: [1.7.1]
• Operating System: [Mac]
• Node.js version: [12, 14.9.0]
• Browser: [Chromium, Firefox]

System:
OS: macOS 11.1
Memory: 1.25 GB / 32.00 GB
Binaries:
Node: 14.9.0 - /usr/local/bin/node
Yarn: 1.22.5 - /usr/local/bin/yarn
npm: 6.14.7 - /usr/local/bin/npm
Languages:
Bash: 3.2.57 - /bin/bash
npmPackages:
playwright: ^1.7.1 => 1.7.1

Describe the bug
I have a website with an iframe inside iframe such as:

<iframe src="https://host-x/">
<iframe src="https://host-x/webview/index.html></iframe>

</iframe>

On chrome when i go to this webside i can see the inner iframe.
When i'm running a test with playwright on this website, the inner iframe is blank. (when i open dev-tools, it's suddenly appears)
When i run the same chromium by my self i can see the inner iframe.

my test config:

            browser = await chromium.launch({headless: isHeadless, args: ["--start-maximized"]});
            page = await browser.newPage(
                {
                    viewport: isHeadless ? {
                            width: 1920,
                            height: 1080
                        } : null
                }
            );

Any idea what could be the issue?

[dgozman]

Try launching like this, to see why Playwright makes it different:

const browser = await chromium.launch({
  ignoreDefaultArgs: ['--disable-features=TranslateUI,BlinkGenPropertyTrees,ImprovedCookieControls,SameSiteByDefaultCookies,LazyFrameLoading']
})

Otherwise, it's hard to help without a repro script.

[JoelEinbinder]

Feel free to reopen this with more info. Thanks!

[odeliat]

I'm trying to figure out this issue.
I added the ignoreDefaultArgs but got the same result.

@dgozman
What are the propose of those ignoreDefaultArgs options?

@JoelEinbinder
What more information do you need?
I also tried it on a windows machine.

Can you please reopen this issue? we couldn't.

Do you have any further ideas on how to solve this?

[dgozman]

@odeliat My snippet disabled some Chromium arguments that might affect iframes visibility.

What more information do you need?

Do you have a repro script by any chance? It is hard to help without a script, or at least a page url that exhibits this behavior.

[odeliat]

@dgozman
One way to reproduce this issue is to open theia IDE gitpod on Chromium.

1. Open Theia Gitpod on a regular browser.
2. Click Open on the master branch:
   
3. Copy the url of the gitpod and open it at Chromium.
4. Login with your git/bitbucket account.
5. Wait for Theia to open.
6. Click on the extensions pane:
   
7. Search for 'Browser Preview' and install it:
   
8. A new icon will appear on the left. Click on it and you need to see a webview but in the Chromium it does not show
   (in the screenshot we see the desired result)
   

You can do the same steps on a regular browser and see that it does show.