[Webkit-unassigned] [Bug 273841] React portal element rendered when clicking on button is not visible half of the time when rendered within an iframe

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=273841

--- Comment #2 from Karl Dubost <karlcow at apple.com> ---
It reminds me about something I have seen yesterday about iframes and subresources onload

Not putting them as related yet, because I'm not sure. 

* Bug 33777
* Bug 17761
* Bug 15505


```
<iframe title="Preview page"
        name="previewFrame"
        class="PreviewFrame-iFrame"
        allow="magnetometer; accelerometer; gyroscope; geolocation; microphone; camera; payment; autoplay; serial; xr-spatial-tracking; cross-origin-isolated"
        src="https://stackblitz-starters-gaok1e.stackblitz.io"
        style="background: rgb(255, 255, 255); height: 579px;"></iframe>
```

Accessing directly 
  https://stackblitz-starters-gaok1e.stackblitz.io
indeed doesn't exhibit the issue.


hmmm there are some code targeting Safari too in there. 
For example: 

```
function noop() {}

function trapClickOnNonInteractiveElement(node) {
  // Mobile Safari does not fire properly bubble click events on
  // non-interactive elements, which means delegated click listeners do not
  // fire. The workaround for this bug involves attaching an empty click
  // listener on the target node.
  // https://www.quirksmode.org/blog/archives/2010/09/click_event_del.html
  // Just set it using the onclick property so that we don't have to manage any
  // bookkeeping for it. Not sure if we need to clear it when the listener is
  // removed.
  // TODO: Only do this for the relevant Safaris maybe?
  node.onclick = noop;
}
```


Not yet at the source of the issue.

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