Bugzilla

Hi, rhunt,

I'm trying to share the CSS transform information with both oop-iframe and non-oop iframe in the same document. For example:
```
<div id="parent">
  <iframe fission id="iframe-oop" src="remote.html"></iframe>
  <iframe id="iframe-non-oop" src="remote2.html"></iframe>
</div>
```

When I have a transform style change on "parent" div, we will propagate the transform update to both iframes. For "iframe-oop", it's very simple, I checked if it is an oop-iframe, and it is, so we follow the steps in comment 2 (i.e. send the IPC message via `BrowserBridge` and store the updated transform in remote `TabChild`).

However, I'm not sure how to update the transform for "iframe-non-oop" element. It is not an oop-iframe, so we don't have `BrowserBridge`. I still want to update the transform stored in its `TabChild`. My question is: Does it have `TabChild`? I tried to get its `TabChild` or inner view, or the frames inside this non-oop iframe by the `nsIDocShell` in its frameloader (i.e. nsFrameLoader::mDocShell), but unfortunately, I cannot get the remote `TabChild` (because it is in-process, I guess), and got null `nsIPresShell`/`nsIPresContext`. Therefore, I have no idea how to update the transform for the non-oop iframe. Not sure which way or which function should I use to share the css transform. Could you please give me some hints? Thanks.

Hi, rhunt,

I'm trying to share the CSS transform information with both oop-iframe and non-oop iframe in the same document. For example:
```
<div id="parent">
  <iframe fission id="iframe-oop" src="remote.html"></iframe>
  <iframe id="iframe-non-oop" src="remote2.html"></iframe>
</div>
```

When I have a transform style change on "parent" div, we will propagate the transform update to both iframes. For "iframe-oop", it's very simple, I checked if it is an oop-iframe, and it is, so we follow the steps in comment 2 (i.e. send the IPC message via `BrowserBridge` and store the updated transform in remote `TabChild`).

However, I'm not sure how to update the transform for "iframe-non-oop" element. It is not an oop-iframe, so we don't have `BrowserBridge`. I still want to update the transform and go through all the iframes inside its subtree. My question is: For non-oop iframe, there is no `TabChild`, right? That means we should not store the transform information in `TabChild`. Besides, I tried to get the `nsIPresShell` or `nsIPresContext` inside this non-oop iframe by its browsing context, but unfortunately, I got null values. Therefore, I have no idea how to update the transform for the non-oop iframe. Not sure which way or which function should I use to share the CSS transform. Could you please give me some hints? Thanks.