Image field: Preview for `.svg` images only works when the `<svg>` element in the image file has explicit `width` and `height` set.

First of all, big thanks for your work with Keystatic!

The following SVG works perfectly fine in our Astro site, but shows up as an empty 0x0 image preview in Keystatic:

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d="M858.65,63.67h68.8c.92,0,1.67.75,1.67,1.67v21.32c0,.92-.75,1.67-1.67,1.67h-38.56c-.92,0-1.67.75-1.67,1.67v48.11c0,.92.75,1.67,1.67,1.67h26.62c.92,0,1.67.75,1.67,1.67v21.05c0,.92-.75,1.67-1.67,1.67h-26.62c-.92,0-1.67.75-1.67,1.67v51.29c0,.92.75,1.67,1.67,1.67h38.56c.92,0,1.67.75,1.67,1.67v21.32c0,.92-.75,1.67-1.67,1.67h-68.8c-.92,0-1.67-.75-1.67-1.67V65.35c0-.92.75-1.67,1.67-1.67Z"/><path d="M967.6,161.01v80.81c0,.92-.75,1.67-1.67,1.67h-26.89c-.92,0-1.67-.75-1.67-1.67V65.35c0-.92.75-1.67,1.67-1.67h42.36c30.5,0,41.64,15.12,41.64,40.32v23.08c0,19.36-6.9,30.77-24.14,34.75l28.12,79.46c.39,1.09-.42,2.23-1.58,2.23h-28.26c-.71,0-1.35-.45-1.58-1.13l-27.99-81.36ZM967.6,90.01v52.62c0,.92.75,1.67,1.67,1.67h8.4c10.35,0,14.85-5.3,14.85-14.85v-26.52c0-9.81-4.51-14.59-14.85-14.59h-8.4c-.92,0-1.67.75-1.67,1.67Z"/><path 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d="M311.49,171.18c-68.52,0-118.07,52.86-118.07,118.07-2.19,61.72,49.54,115.52,118.07,118.07,70.9,0,118.07-52.86,118.07-118.07,0-68.52-52.86-118.07-118.07-118.07ZM381,358.76c-18.57,18.57-43.25,28.79-69.51,28.79s-50.94-10.23-69.51-28.79c-18.57-18.57-29.61-50.43-28.79-69.51-.04-31.78,10.23-50.94,28.79-69.51,18.57-18.57,43.25-28.79,69.51-28.79,34.97,1.66,50.94,10.23,69.51,28.79,18.57,18.57,28.79,43.25,28.79,69.51-.5,26.52-9.73,53.74-28.79,69.51Z"/><path d="M309.86,44.56c-134.54-6.81-243.92,116.12-243.92,243.92,0,134.41,109.21,243.92,243.92,243.92,157.39,0,243.92-117.12,243.92-243.92,0-134.71-92.1-236.23-243.92-243.92ZM309.85,512.57c-123.77,0-215.78-100.61-224.1-224.1-7.07-104.85,100.49-230.36,224.1-224.1,139.49,7.06,224.1,100.33,224.1,224.1,0,114.9-82.81,224.1-224.1,224.1Z"/></svg>

I compared the SVG image content to other SVG:s that work as expected, and found that the reason the other SVG:s worked in the Keystatic image preview was because they had explicit width and height attributes set on the <svg> element.

Once I updated the SVG file, it started showing up as expected in Keystatic. Since this shows properly in Astro, I suspect there might be some difference in how SVG:s are rendered in Keystatic. Perhaps they need to be forced to grow to a certain size, rather than scaling down to 0x0 which seems to be the default if they don't have explicit width and height set.

<svg id="Logo" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1094 578" width="547" height="289"><path d="M700.8,471.24v-77.48c0-25.04,12.28-43.23,40.63-43.23s40.87,18.19,40.87,43.23v77.48c0,24.8-12.29,43.23-40.87,43.23s-40.63-18.43-40.63-43.23ZM755.37,475.49v-85.99c0-9.68-4.25-16.53-13.94-16.53s-13.7,6.85-13.7,16.53v85.99c0,9.69,4.25,16.54,13.7,16.54s13.94-6.85,13.94-16.54Z"/><path d="M785.23,510.78l29.66-157.12c.14-.72.76-1.24,1.49-1.24h28.2c.73,0,1.36.52,1.49,1.23l29.89,157.12c.18.94-.54,1.8-1.49,1.8h-24.52c-.74,0-1.37-.53-1.5-1.26l-4.53-26.76c-.12-.73-.76-1.26-1.5-1.26h-26.01c-.75,0-1.38.54-1.5,1.28l-4.31,26.74c-.12.74-.75,1.28-1.5,1.28h-22.39c-.95,0-1.67-.87-1.49-1.8ZM820.46,461.79h17.92c.94,0,1.65-.84,1.5-1.77l-10.34-62.49h-.24l-10.34,62.49c-.15.92.56,1.77,1.5,1.77Z"/><path 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Versions used

We seem to be using the latest versions of Keystatic as of writing.

# pnpm-lock.yaml

'@keystatic/astro':
  specifier: ^5.0.4
  version: 5.0.4(@keystatic/core@0.5.43(react-dom@18.3.1(react@18.3.1))(react@18.3.1))(astro@5.1.2(@types/node@20.11.26)(idb-keyval@6.2.1)(jiti@1.21.7)(rollup@4.29.1)(terser@5.29.1)(typescript@5.4.2)(yaml@2.7.0))(react-dom@18.3.1(react@18.3.1))(react@18.3.1)
'@keystatic/core':
  specifier: ^0.5.43
  version: 0.5.43(react-dom@18.3.1(react@18.3.1))(react@18.3.1)
astro:
  specifier: ^5.1.2
  version: 5.1.2(@types/node@20.11.26)(idb-keyval@6.2.1)(jiti@1.21.7)(rollup@4.29.1)(terser@5.29.1)(typescript@5.4.2)(yaml@2.7.0)
react:
  specifier: ^18.2.0
  version: 18.3.1
react-dom:
  specifier: ^18.2.0
  version: 18.3.1(react@18.3.1)

Happy to help debug and fix this.

Start by reproducing the issue in the Keystatic image preview with the provided SVG, comparing an SVG with only a viewBox against one with explicit width and height. Trace the preview entry point to determine why the first renders at 0x0; done means viewBox-only SVGs display at a usable size without requiring those attributes.