CSP-compatible editor

[thibaudcolas]

Is your proposal related to a problem?

Part of Wagtail CSP compatibility. Two of the editor’s components rely on dynamic <style> tag generation, so aren’t CSP-friendly:

• PlaceholderStyles
• ListNestingStyles

Describe the solution you’d like

They should be converted to CSP-friendly alternatives, or at least support setting a nonce.

Describe alternatives you’ve considered

None

[thibaudcolas]

Constructable Stylesheets