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 
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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:
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