Getting a weird error with transparent/frameless window and resizable div

I am trying to make a resizable and draggable div on a transparent to allow selection of specific part of a screen. I am getting this while resizing and dragging the div.

Image

Please note, this only happens with transparent windows.

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Hey, thanks for the reply.
If you can help me with, how I can rephrase this. That’d be awesome.

This was due to broswerwindow shadow property. Adding “hasShadow: false” solved this.