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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Test Reference</title>
<link rel="author" href="mailto:jeroen.zwartepoorte@gmail.com">
<style>
.cases {
display: flex;
flex-wrap: wrap;
gap: 8px;
width: 642px;
}
.case {
position: relative;
box-sizing: border-box;
width: 122px;
height: 102px;
border: 1px solid silver;
}
.anchor {
position: absolute;
left: 20px;
top: 20px;
width: 50px;
height: 20px;
background: silver;
}
.probe {
position: absolute;
width: 20px;
height: 20px;
background: green;
}
.anchored {
left: 70px;
top: 40px;
}
.unanchored {
left: 20px;
top: 70px;
}
</style>
<div class="cases">
<!-- Parent has a default anchor element. -->
<div class="case">
<div class="anchor"></div>
<div class="probe anchored"></div>
</div>
<!-- Parent has 'position-anchor: none'. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
<!-- Parent's 'position-anchor' selects no anchor element. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
<!-- Parent is not positioned. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
<!-- Parent is relatively positioned, so 'position-anchor' does not apply. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
<!-- Parent also uses 'match-parent'. -->
<div class="case">
<div class="anchor"></div>
<div class="probe anchored"></div>
</div>
<!-- Chain of 'match-parent' parents, several levels deep. -->
<div class="case">
<div class="anchor"></div>
<div class="probe anchored"></div>
</div>
<!-- Parent's 'match-parent' resolved to no anchor element. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
<!-- Only the grandparent has a default anchor element. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
<!-- Anchored ancestor, with plain wrappers in between. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
<!-- Intermediate 'match-parent' is not absolutely positioned. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
<!-- Parent's default anchor element is not acceptable for the probe. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
<!-- Originating element of a '::before' has a default anchor element. -->
<div class="case">
<div class="anchor"></div>
<div class="probe anchored"></div>
</div>
<!-- Originating element of a '::before' has no default anchor element. -->
<div class="case">
<div class="anchor"></div>
<div class="probe unanchored"></div>
</div>
</div>