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813813An [artifact](/docs/en/artifacts) that loads a typeface from [Google Fonts](/docs/en/artifacts#improve-the-visual-design) also requests `fonts.googleapis.com` and `fonts.gstatic.com`. Both hosts are optional. If you block them, artifacts render in fallback typefaces. Block with a fast rejection rather than a silent drop so the font request fails immediately instead of delaying the page's first render.
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815Artifacts can also load JavaScript libraries, such as React or a charting package, from `cdnjs.cloudflare.com`, `cdn.jsdelivr.net`, `cdn.tailwindcss.com`, and `code.jquery.com`, and from no other external host. If you block those hosts, the parts of an artifact that depend on a library don't work, and unlike a blocked font, a blocked library has no fallback. Block with a fast rejection here too, so a blocked library request fails at once rather than hanging until it times out.
815Artifacts can also load JavaScript libraries, such as React or a charting package, from `cdnjs.cloudflare.com`, `cdn.jsdelivr.net`, `cdn.tailwindcss.com`, `code.jquery.com`, and `unpkg.com`, and from no other external host. If you block those hosts, the parts of an artifact that depend on a library don't work, and unlike a blocked font, a blocked library has no fallback. Block with a fast rejection here too, so a blocked library request fails at once rather than hanging until it times out.
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817817### Authentication and SSO
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