Deprecations and removals in Chrome 83

Disallow downloads in Sandboxed iframes

Chrome now prevents downloads in sandboxed iframes, though this restriction can
be lifted via an 'allow-downloads' keyword in the sandbox attribute list. This
allows content providers to restrict malicious or abusive downloads. Downloads
can bring security vulnerabilities to a system. Even though additional security
checks are done in Chrome and the operating system, we feel blocking downloads
in sandboxed iframes also fits the purpose of the sandbox.

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