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chromium/third_party/blink/web_tests/external/wpt/html/webappapis/system-state-and-capabilities/the-navigator-object/protocol.tentative.https.html 

<!DOCTYPE html>
<meta charset='utf-8'>
<title>protocol handlers</title>

<script src='/resources/testharness.js'></script>
<script src='/resources/testharnessreport.js'></script>

<script>
// This should be merged into protocol.https.html when/if
// https://github.com/whatwg/html/pull/5482 is approved.
[
  'cabal',
  'dat',
  'did',
  'dweb',
  'ethereum',
  'hyper',
  'ipfs',
  'ipns',
  'ssb',
].forEach(scheme => {
  test(() => {
    navigator.registerProtocolHandler(scheme, location.href + '/%s', "foo");
  }, 'registerProtocolHandler: overriding the "' + scheme + '" protocol should work');

  test(() => {
    navigator.unregisterProtocolHandler(scheme, location.href + '/%s');
  }, 'unregisterProtocolHandler: overriding the "' + scheme + '" protocol should work');
});
</script>