# Error rendering video when joining to session related with 'experimental-webgl'

**URL:** <https://devforum.zoom.us/t/error-rendering-video-when-joining-to-session-related-with-experimental-webgl/122419>\
**Category:** Video SDK\
**Created:** [December 13, 2024, 10:29pm UTC](https://devforum.zoom.us/t/error-rendering-video-when-joining-to-session-related-with-experimental-webgl/122419 "2024-12-13T22:29:33Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![luis.sanchez](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/luis.sanchez/32/65253_2.png) [@luis.sanchez](https://devforum.zoom.us/u/luis.sanchez)\
**Post date:** [December 13, 2024, 10:29pm UTC](https://devforum.zoom.us/t/error-rendering-video-when-joining-to-session-related-with-experimental-webgl/122419/1 "2024-12-13T22:29:33Z")

</div>

### Format Your New Topic as Follows:

**Which Web [Video SDK](https://developers.zoom.us/docs/video-sdk) version?**  
1.11.0

**Zoom Session Id**  
M0Ry8asrT/C6kEzM/Y4Gag==

**Description**  
When a user was joining to the session, an error was trigger, he was able to join but the camera couldn’t render, he tried turning off and on the camera, but the camera wasn’t still rendered.

**Error Message**

```auto
The provided value 'experimental-webgl' is not a valid enum value of type OffscreenRenderingContextType.
    at https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:30079
    at Object.<anonymous> (https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:30412)
    at r (https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:448)
    at Module.<anonymous> (https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:135279)
    at r (https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:448)
    at Object.<anonymous> (https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:112565)
    at r (https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:448)
    at https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:1247
    at https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:1257
    at https://source.zoom.us/videosdk/1.11.0/lib/js_media.min.js:1:287",
    "message": "Failed to execute 'getContext' on 'OffscreenCanvas': The provided value 'experimental-webgl' is not a valid enum value of type OffscreenRenderingContextType.

```

The weird thing is that his bVideoOn was set on 1 and 0 when he tried to turn on/off the camera, so it looks like it was only a render issue  
And he tried reloading the page but still got the same error.

**How To Reproduce**  
_Steps to reproduce the behavior including:_  
_1. Authentication method or app type_  
_2. Any errors_  
_3. Browser/client type and version_

**Browser**  
Mozilla/5.0 (Macintosh; Intel Mac OS X 10\_15\_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Here is more data about the session, I store records from the logs of the event “video-statistic-data-change”

 ![image](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/b/8/b88a75e7fa3fe1eae0b12f7aaff1dc0836e28d42.png)

---

<div class="post-metadata">

**Author:** ![ekaansh.zoom](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/ekaansh.zoom/32/55004_2.png) [@ekaansh.zoom](https://devforum.zoom.us/u/ekaansh.zoom)\
**Post date:** [December 17, 2024, 4:28pm UTC](https://devforum.zoom.us/t/error-rendering-video-when-joining-to-session-related-with-experimental-webgl/122419/2 "2024-12-17T16:28:41Z")

</div>

Hi @luis.sanchez this looks like an error arising from the browser. The SDK requires `webgl` support but the browser your user is using isn’t reporting “full webgl support” perhaps.

From [this answer](https://stackoverflow.com/a/41346263):

> “experimental-webgl” = beta, it was used by browsers before WebGL 1.0 shipped to try to indicate _this is not final_.

Can you share the browser details? The user agent doesn’t tell us much.