kernl API
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    Variable KERNL_FRAME_POLICY_METAConst

    KERNL_FRAME_POLICY_META: string = ...

    The <meta> element the host page puts in its <head> so applet frames can never navigate away from their verified srcdoc. Rendered once by kehto.

    document.head.insertAdjacentHTML('afterbegin', KERNL_FRAME_POLICY_META);