Add sandboxing to Iframes with `allow-scripts`
Add sandboxing to Iframes with `allow-scripts`

CenterForOpenScience/modular-file-renderer,TomBaxter/modular-file-renderer,AddisonSchiller/modular-file-renderer,AddisonSchiller/modular-file-renderer,AddisonSchiller/modular-file-renderer,AddisonSchiller/modular-file-renderer,felliott/modular-file-renderer,felliott/modular-file-renderer,TomBaxter/modular-file-renderer,felliott/modular-file-renderer,CenterForOpenScience/modular-file-renderer,CenterForOpenScience/modular-file-renderer,TomBaxter/modular-file-renderer,TomBaxter/modular-file-renderer,felliott/modular-file-renderer,CenterForOpenScience/modular-file-renderer