Access to cssRules Denied from Local CSS Files in Chrome 64
Issue: Why is access to cssRules from a CSS stylesheet loaded from the local filesystem denied in Chrome 64?
Cause: Chrome 64 introduced security changes that enforce Cross-Origin Resource Sharing (CORS) policies. Accessing CSS rules from a local stylesheet violates this policy, resulting in access being denied.
Workarounds:
Explanation:
The updated behavior aligns with the CSS Object Model specification, which requires same-origin access for certain CSS operations. This security measure prevents unauthorized modification of cross-origin stylesheets.
Current Status:
The introduced security changes have sparked some debate. Open issues include detection methods for restricted access and potential implementation issues that affect workarounds. The specification is still under development, so the long-term implications may vary.
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