1338772-1.html - mozsearch

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<!DOCTYPE html>

<html class="reftest-wait">

<script>

function loadHandler() {

  var outer = document.getElementById("outer");

  var inner = document.createElement("iframe");

  inner.height = "1px";

  outer.contentDocument.body.appendChild(inner);

  // Flush reflow inside our inner iframe. This ensures that our inner.height

  // tweak further down will actually invoke the resize handler.

  inner.contentWindow.offsetTop;

  // Set up resize handler (which ends the test, one way or another)

  inner.contentWindow.onresize = () => {

    outer.remove();

    document.documentElement.removeAttribute("class");

};

  // Trigger the resize handler:

  inner.height = "5px";

  inner.offsetTop;

// This function is a hack to avoid sporadic test-failures with...

//   "...timed out waiting for reftest-wait to be removed".

// Occasionally, it seems this test loses a race condition of some sort, and

// its resize handler isn't invoked. When that happens (and specifically, when

// the test runs for longer than 500ms), we clear reftest-wait and call the

// run a "pass" (which is kind of valid, because we didn't crash!) and move on.

function setupFailsafe() {

  setTimeout(() => {

    document.documentElement.removeAttribute("class");

  }, 500);

</script>

<body onload="setupFailsafe()">

  <iframe id="outer"

          src="data:text/html,<html><body>"

          onload="loadHandler()">

  </iframe>

</body>