Failed to generate Critical CSS

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  • Hi @watz2000

    With the X-Frame-Options issue you are seeing, when a site has X-Frame-Options: DENY in its HTTP headers, browsers will refuse to load it inside iframes. That currently breaks our local Critical CSS generator – we’re currently working on better error reporting to help with this issue.

    However X-Frame-Options SAMEORIGIN works fine with Jetpack Boost. Are you aware of any settings on your site’s server that will affect HTTP headers? It looks like this may be something your host could help with though – I came across this link which does explain HTTP headers and how to change them in a little more detail: https://www.geeksforgeeks.org/http-headers-x-frame-options/

    I hope that helps somewhat, but if you have further questions do let us know.

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