У вашего броузера проблема в совместимости с HTML5
Note:
This has been solved. The was a PEBKAC. I assumed that the backbuffer gets cleared by default. The behavior you see in the video is expected. You my add a background to make sure the backbuffer gets cleared to a known state.
https://touchgfx.zendesk.com/hc/en-us/community/posts/115001696585-TouchGFX-4-8-is-broken-LPC54608