This appears to work fine for me with Chrome 68.0.3440.106 on Linux as well. Since this is a canvas over to the canvas team.

Perhaps its depend on software or hardware webgl.

Can't reproduce on ToT.

If this is happening in other sites to you?
If so, could you please attach a copy of your chrome://gpu ?

I have same bug here
http://poki.com/en/g/doodle-jump
and here
http://poki.com/en/g/cut-the-rope-experiments

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Unable to reproduce the issue on chrome reported version# 68.0.3440.106 using Ubuntu 14.04 with steps mentioned below:
1) Launched chrome version# 64.0.3282.140 and navigated to URL: http://wellgames.com/free_online/bubble-number/, page got loaded successfully
2) Updated chrome to latest stable# 68.0.3440.106 and navigated to URL: http://wellgames.com/free_online/bubble-number/, able to see page loading completely

@Reporter: Please find the attached screenshot for your reference, try to test this issue by creating new person with no apps and extensions in it and let us know if the issue still persists. Attached are the GPU details. As per comment# 4, could you please provide GPU details by navigating to Chrome://gpu.

Thanks!

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Yours
Canvas: Hardware accelerated
Flash: Hardware accelerated
Flash Stage3D: Hardware accelerated
Flash Stage3D Baseline profile: Hardware accelerated
Compositing: Hardware accelerated
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Hardware Protected Video Decode: Unavailable
Rasterization: Software only. Hardware acceleration disabled
Skia Deferred Display List: Disabled
Skia Renderer: Disabled
Surface Synchronization: Enabled
Video Decode: Unavailable
Viz Service Display Compositor: Disabled
WebGL: Hardware accelerated
WebGL2: Hardware accelerated

And my GPU

Canvas: Software only, hardware acceleration unavailable
Flash: Software only. Hardware acceleration disabled
Flash Stage3D: Software only. Hardware acceleration disabled
Flash Stage3D Baseline profile: Software only. Hardware acceleration disabled
Compositing: Software only. Hardware acceleration disabled
Multiple Raster Threads: Enabled
Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
Hardware Protected Video Decode: Disabled
Rasterization: Software only. Hardware acceleration disabled
Skia Deferred Display List: Disabled
Skia Renderer: Disabled
Surface Synchronization: Enabled
Video Decode: Software only. Hardware acceleration disabled
Viz Service Display Compositor: Disabled
WebGL: Software only, hardware acceleration unavailable
WebGL2: Software only, hardware acceleration unavailable

I have every where software only

https://bugs.chromium.org/p/chromium/issues/attachment?aid=353151&signed_aid=Sn1yEZbikE75GLPHqGYgwA==

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

I turned off all extensions, but issue still persist.

Is this software canvas issue?

This really doesn't look like a canvas problem.
It's exclusive to his machine, right?
Assuming that his gpuinfo means that he has a completely blacklisted GPU, I'm adding Skia here. 

hcm: can you triage this?

After updating to version 69.0.3497.81 all work perfectly. Thanks.