Digest preview html view not working

It looks like the html view for the digest preview is not working:

The text view appears to work fine:

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Works fine here on meta.

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That screenshot is from meta :confused:

Ohhh it works in chrome, but not firefox.

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Hmm why would this not work in Firefox? Odd cc @eviltrout but not remotely urgent.

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It looks like using a src with a data attribute you’re limited to 32k, and our new digest email was much bigger. Using srcDoc seems to fix it: