fix: "Save as picture" feature (XLSX) not working - #162
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Saving a chart as an image renders a data:image/png;base64 URI in an iframe, which the CSP frame-src directive currently blocks as "data:" isn't implicitly covered by an origin allowlist.
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Saving a chart as an image renders a data:image/png;base64 URI in an iframe, which the CSP frame-src directive currently blocks as "data:" isn't implicitly covered by an origin allowlist.
This results in a javascript console error "Content-Security-Policy: The page’s settings blocked the loading of a resource (frame-src) at data:image/png;base64,iVBORw0KGgoAAAANSU… because it violates the following directive: “frame-src 'self' https://eurooffice.example.com”