<!DOCTYPE html><html><head><scriptsrc="/resources/testharness.js"></script><scriptsrc="/resources/testharnessreport.js"></script><scriptsrc="support/frame-ancestors-test.sub.js"></script></head><body><script>test=async_test("A 'frame-ancestors' CSP directive with a value 'none' should block rendering in nested frames.");testNestedIFrame("'none'",SAME_ORIGIN,CROSS_ORIGIN,EXPECT_BLOCK);</script></body></html>