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<!DOCTYPE html>
<link rel="help" href="https://drafts.csswg.org/css-anchor-1/#fallback">
<link rel="author" href="mailto:kojii@chromium.org">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/check-layout-th.js"></script>
<script src="support/test-common.js"></script>
<style>
.cb {
position: relative;
width: 190px;
height: 70px;
background: yellow;
border-bottom: 1px solid black;
}
.spacer {
width: 1px;
height: 20px;
}
.anchor1 {
anchor-name: --a1;
margin-left: 45px;
width: 100px;
height: 30px;
background: blue;
}
.target {
position: absolute;
position-fallback: --fallback1;
width: 40px;
height: 15px;
margin: 5px;
background: orange;
}
@position-fallback --fallback1 {
@try { /* 1: Position to the right of the anchor. */
left: anchor(--a1 right);
top: anchor(--a1 top);
}
@try { /* 2: Position to the left of the anchor. */
right: anchor(--a1 left);
top: anchor(--a1 top);
}
@try { /* 3: Position to the bottom of the anchor. */
left: anchor(--a1 left);
top: anchor(--a1 bottom);
}
@try { /* 4: Position to the top of the anchor. */
left: anchor(--a1 left);
bottom: anchor(--a1 top);
}
@try { /* 5: Position to the left with the narrower width. */
left: anchor(--a1 right);
top: anchor(--a1 top);
width: 35px;
height: 40px;
}
}
</style>
<body onload="checkLayoutForAnchorPos('.target')">
<!-- If the `cb` is wider, the 1st `@try` fits. -->
<div class="cb" style="width: 195px">
<div class="spacer"></div>
<div class="anchor1"></div>
<div class="target"
data-offset-x=150 data-offset-y=25
data-expected-width=40 data-expected-height=15></div>
</div>
<!-- If the `margin-left` is wider, the 2nd `@try` fits. -->
<div class="cb">
<div class="spacer"></div>
<div class="anchor1" style="margin-left: 50px"></div>
<div class="target"
data-offset-x=5 data-offset-y=25
data-expected-width=40 data-expected-height=15></div>
</div>
<!-- Without a spacer, the 3rd `@try` fits. -->
<div class="cb">
<div class="anchor1"></div>
<div class="target"
data-offset-x=50 data-offset-y=35
data-expected-width=40 data-expected-height=15></div>
</div>
<!-- With two spacers, the 4th `@try` fits. -->
<div class="cb">
<div class="spacer"></div>
<div class="spacer"></div>
<div class="anchor1"></div>
<div class="target"
data-offset-x=50 data-offset-y=20
data-expected-width=40 data-expected-height=15></div>
</div>
<!-- With a spacer, the last `@try` fits. -->
<div class="cb">
<div class="spacer"></div>
<div class="anchor1"></div>
<div class="target"
data-offset-x=150 data-offset-y=25
data-expected-width=35 data-expected-height=40></div>
</div>
<!-- If the `cb` is narrower, no rules fit. The last rule is used. -->
<div class="cb" style="width: 185px">
<div class="spacer"></div>
<div class="anchor1"></div>
<div class="target"
data-offset-x=150 data-offset-y=25
data-expected-width=35 data-expected-height=40></div>
</div>
</body>
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