I finally fixed the Vao in Chromium-based browsers. Looking at the SVG code, the style code for the triangles included ;filter:url(#filter855) even though this filter was not defined anywhere in the SVG code. I removed it to see what effect it would have. The image in Firefox remained unchanged, and the image in Chrome, Edge, and Vivaldi all now showed the triangular base.
I finally fixed the Vao in Chromium-based browsers. Looking at the SVG code, the style code for the triangles included
;filter:url(#filter855)even though this filter was not defined anywhere in the SVG code. I removed it to see what effect it would have. The image in Firefox remained unchanged, and the image in Chrome, Edge, and Vivaldi all now showed the triangular base.