This is a testharness.js-based test.
[FAIL] Reloading iframe loading='lazy' before it is loaded: navigation.reload
  Uncaught Error: assert_equals: expected "http://web-platform.test:8001/html/semantics/embedded-content/the-iframe-element/support/blank.htm?src" but got "about:blank"
Harness: the test ran to completion.