Add flexbox properties to chat CSS whitelist

I recently discovered that, while styling messages via sendchat, "display: flex", "justify-content", and other flexbox-related properties seem to not be whitelisted in terms of CSS styles that are applicable to messages. As a script author, this is a bit of a hinderance to me and makes me have to resort to certain workarounds in order to style messages how I want to. Would it be possible for flexbox and related properties to be whitelisted at all? I'm not sure if this has been intentionally left out or if it's something that was just overlooked.

I'm pretty sure that it is an issue with how you're using it. They work fine in character sheets and styling of roll templates via character sheets.

I'm aware that they work fine in character sheets and rolltemplates, it's just that styling messages with the API via sendchat seems to 'snip' out flexbox-related properties for some reason. I assumed it was because they just weren't on the whitelist of acceptable CSS properties for the API.

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