Minor Feedbin RSS Bug? (EDIT: Not a bug.)

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I think I just uncovered a minor bug in Feedbin‘s RSS parsing.

Update: Not a bug! Feedbin support confirmed that they “aggressively” sanitize markup, for various reasons including security and ensuring that any CSS doesn’t break Feedbin’s rendering when viewed on the Feedbin site.

I used some inline CSS to flip an emoji upside-down in a recent blog post, but it’s displaying right side up in Feedbin (and therefore in NetNewsWire, so at first I thought it was a bug there, but if I let NNW read the RSS directly instead of pulling from Feedbin, it displays the inverted emoji properly).)

Screenshot showing the inverted emoji on my website on the left and right side up in Feedbin on the right.

I’ve confirmed that the inline CSS is present in the raw RSS feed (which makes sense, since it displays properly when loaded directly in NNW).

Screenshot of the proper HTML/CSS in the RSS feed as seen in BBEdit.

But when I use Safari’s inspector to peek at the HTML that Feedbin is rendering, though the span tag is there, the style argument with the inline CSS has been stripped out.

Screenshot of the HTML as served by Feedbin showing a span tag with no arguments.

Is this a bug? Or is Feedbin intentionally stripping inline CSS style declarations out for some reason? Update: Not a bug! See the added note at the beginning of this post.