v1.10.0+fa23

This minor update fixes an issue with Mermaid diagrams not rendering in specs. You'll need to trigger your Jekyll website to be rebuilt to see the fix! (The easiest way to trigger a re-deploy is to push a new commit.)

Many thanks to @amirkamil for reporting the issue! See #254 for more information.

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I also included some JS housekeeping (#253) in this release, mostly because I had already decided to include these in the next minor version update to Primer Spec.