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Test Info:

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body { height: 2000px; margin: 0 10px; }
#before, #after { height: 100px; }
#before { margin-bottom: 100px; }
#container { line-height: 100px; vertical-align: top; }
</style>
<div id="container">
<div id="before">before</div>
<span id="inline">inline</span>
<div id="after">after</div>
</div>
<script>
// Tests anchoring inside an anonymous block box. The anchor selection algorithm
// should descend into the children of the anonymous box even though it is fully
// contained in the viewport.
test(() => {
document.scrollingElement.scrollTop = 150;
var span = document.querySelector("#inline");
var newSpan = document.createElement("span");
newSpan.innerHTML = "inserted<br>";
span.parentNode.insertBefore(newSpan, span);
assert_equals(document.scrollingElement.scrollTop, 250);
}, "Anchor selection descent into anonymous block boxes.");
</script>