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<!DOCTYPE html>
<style>
#target {
width: 100px;
height: 100px;
background-color: green;
}
.spacer {
width: height: 100px
}
</style>
<div class="spacer"></div>
<div id="target"></div>
<div class="spacer"></div>
<script>
document.createObserverCallback = function(entries) {
return function(newEntries) {
for (var i in newEntries) {
entries.push(newEntries[i]);
}
};
}
document.createObserver = function(callback) {
return new IntersectionObserver(callback, {});
};
</script>