<!DOCTYPE html>
<html>
<style>
.parent {
position: relative;
}
#named-anchor {
anchor-name: --anc;
}
#default-anchor {
anchor-name: --default;
}
#unreachable-anchor {
anchor-name: --unreachable;
}
#target {
position: absolute;
}
#default-target {
position-anchor: --default;
position: absolute;
}
</style>
<body>
<div class="parent">
<div id="named-anchor"></div>
<div id="implicit-anchor"></div>
<div id="default-anchor"></div>
<div id="target" anchor="implicit-anchor"></div>
<div id="default-target"></div>
</div>
<div id="unreachable-anchor"></div>
</body>
</html>