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chromium/third_party/blink/web_tests/external/wpt/html/browsers/browsing-the-web/scroll-to-fragid/scroll-to-id-top.html 

<!doctype html>
<title>Fragment Navigation: TOP is a valid element id, which overrides navigating to top of the document</title>
<meta name=timeout content=long>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div></div>
<div id="Top" style="position:absolute; top:200px;"></div>
<div style="height:200em; position:relative;"></div>
<script>
var steps = [{
    fragid:'Top',
    handler: function(){
      assert_equals( scrollPosition(), 200 );
    }
  },{
    // scroling to top should work when fragid differs from id by case.
    fragid:'top',
    handler: function(){
      assert_equals( scrollPosition(), 0 );
    }
  }];

function scrollPosition(){
  return document.documentElement.scrollTop || document.body.scrollTop;
}

function runNextStep(){
    if( steps.length > 0 ) {
      var step = steps.shift();
      var listener = t.step_func( function(){
        step.handler();
        runNextStep();
      });
      scrollToFragmentThenDo( step.fragid, listener );
    } else {
      t.done();
    }
}

function scrollToFragmentThenDo( fragid, then ){
  location.hash = fragid;
  setTimeout( then, 1 );
}

var t = async_test();
t.step( function(){
  assert_equals(location.hash, "", "Page must be loaded with no hash");
  runNextStep();
})
</script>