StackBlitz Security Basics Overview Secure WebContainer deployments: CSP headers, sandbox isolation, input validation. Instructions Step 1: WebContainer Security Model WebContainers run in the browser sandbox -- no access to host filesystem, network is limited to HTTP, and all code runs in the user's browser tab. Key security points: Step 2: Validate User Input Step 3: Content Security Policy Security Checklist - [ ] COOP/COEP headers set correctly - [ ] User-provided code sandboxed in WebContainer - [ ] No secrets passed to WebContainer file system - [ ] CSP headers configured - [ ] Input va…