Black lines appear while Top Plate Charge and Stored Energy bars go down

[Matthew-Moore240]

Test device Win 10 Firefox Operating System Win 10 Browser Firefox 87.0 64 bit Problem description Black and grey lines appear when Top Plate Charge and Stored Energy bars are losing charge. I also tested on chrome and I could not reproduce the graphical error Steps to reproduce

1. Check Top Plate Charge and Stored Energy
2. Select slow mode
3. Put battery -1.5v
4. Set separation to 2.0mm
5. Set Plate Area to 400mm
6. Turn on the light
7. While the light is going quickly set separation to 10mm Visuals

Troubleshooting information: !!!!! DO NOT EDIT !!!!! Name: ‪Capacitor Lab: Basics‬ URL: https://phet-dev.colorado.edu/html/capacitor-lab-basics/1.8.0-dev.6/phet/capacitor-lab-basics_en_phet.html Version: 1.8.0-dev.6 2021-04-12 21:29:04 UTC Features missing: touch Flags: pixelRatioScaling User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:87.0) Gecko/20100101 Firefox/87.0 Language: en-US Window: 2048x1038 Pixel Ratio: 1.25/1 WebGL: WebGL 1.0 GLSL: WebGL GLSL ES 1.0 Vendor: Mozilla (Mozilla) Vertex: attribs: 16 varying: 30 uniform: 4095 Texture: size: 16384 imageUnits: 16 (vertex: 16, combined: 32) Max viewport: 32767x32767 OES_texture_float: true Dependencies JSON: {}

[arouinfar]

I was not able to reproduce this in Firefox/macOS 10.15.7.

[arouinfar]

Tagging https://github.com/phetsims/QA/issues/640 so it shows up in the QA issue.

[jonathanolson]

I'll look into whether I can add a hidden (invisible) element to do the trick.

[jonathanolson]

Added a potential workaround above, can you try out master to see if it's resolved?

[Matthew-Moore240]

@jonathanolson It looks good to me. I was not able to replicate it.

[jonathanolson]

Thanks!