Load it
This build targets Vega 6. Loaded next to a different major version of Vega it throws when it registers itself.
<script src="https://cdn.jsdelivr.net/npm/vega@6/build/vega.min.js"></script>
<script src="https://vega.github.io/vega-webgpu/releases/2_0_1/vega-webgpu-renderer.min.js"></script>Fixes
- A rect or group with square corners and a stroke stops its fill at its own edge, where the fill reached under the outer half of the stroke: the antialiased edge came out darker, and a translucent stroke showed the fill through it