no-transition-on-implicit-margins.html

<style>
input {
  transition: margin 1s, background 200ms;
}
</style>
<body>
Tests that transitions don't trigger due to intrinsic margins.
<input type="submit" value="Button"></input>
<script>
if (window.testRunner) {
  testRunner.dumpAsText();
  testRunner.waitUntilDone();
}
onload = function() {
  var finished = false;
  var target = document.querySelector('input');
  var marginBefore = getComputedStyle(target).margin;
  target.offsetTop;
  target.style.background = 'green';
  // The background transition should finish before any transition on margin.
  target.addEventListener('transitionend', function() {
    if (finished)
      return;
    finished = true;
    var marginAfter = getComputedStyle(target).margin
    document.body.textContent = marginBefore == marginAfter ?
        'PASS' :
        'FAIL: expected [' + marginBefore + '] but was [' + marginAfter + ']';
    if (window.testRunner) {
      testRunner.notifyDone();
    }
  });
};
</script>

chromium/third_party/blink/web_tests/transitions/no-transition-on-implicit-margins.html