playground: secure CDN resources with Subresource Integrity #568
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The current HTTP handler for the playground leave a way to load tampered resources, either with a faulty CDN or through a man-in-the-middle.
This PR add Subresource Integrity for those external resources. If such tampering happen, the browser will simply refuse to load them.
Btw, jsdelivr conveniently provide the SRI hash, so updating the playground will still be easy.