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<!DOCTYPE html>
<title>Tests anchor positioning in a scroller with left-hand-side scrollbar</title>
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/">
<link rel="author" href="mailto:kiet.ho@apple.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
.containing-block {
position: relative;
height: 100px;
width: 100px;
overflow: scroll;
}
#containing-block-vertical-rl {
writing-mode: vertical-rl;
}
.anchor {
width: 20px;
height: 20px;
background: red;
position: absolute;
left: 50px;
top: 50px;
}
#anchor-1 {
anchor-name: --anchor1;
}
#anchor-2 {
anchor-name: --anchor2;
}
.target-anchor-function {
position: absolute;
top: anchor(top);
left: anchor(left);
right: anchor(right);
bottom: anchor(bottom);
background: green;
}
#target-anchor-function-1 {
position-anchor: --anchor1;
}
#target-anchor-function-2 {
position-anchor: --anchor2;
}
.target-position-area {
position: absolute;
position-area: center center;
width: 100%;
height: 100%;
background: blue;
}
#target-position-area-1 {
position-anchor: --anchor1;
}
#target-position-area-2 {
position-anchor: --anchor2;
}
</style>
<div class="containing-block" dir="rtl">
<!-- Long content to force scrollbar. -->
<div style="height: 200px"></div>
<div class="anchor" id="anchor-1"></div>
<div class="target-anchor-function" id="target-anchor-function-1"></div>
<div class="target-position-area" id="target-position-area-1"></div>
</div>
<div class="containing-block" id="containing-block-vertical-rl">
<!-- Long content to force scrollbar. -->
<div style="height: 200px; width: 20px"></div>
<div class="anchor" id="anchor-2"></div>
<div class="target-anchor-function" id="target-anchor-function-2"></div>
<div class="target-position-area" id="target-position-area-2"></div>
</div>
<script>
function getBoundingClientRectAsArray(element) {
const rect = element.getBoundingClientRect();
return [rect.left, rect.top, rect.right, rect.bottom];
}
test(() => {
const anchor = document.getElementById("anchor-1");
const targetAnchorFunction = document.getElementById("target-anchor-function-1");
assert_array_equals(getBoundingClientRectAsArray(anchor), getBoundingClientRectAsArray(targetAnchorFunction));
}, "anchor-positioned element using anchor() in horizontal, right-to-left scroller");
test(() => {
const anchor = document.getElementById("anchor-1");
const targetPositionArea = document.getElementById("target-position-area-1");
assert_array_equals(getBoundingClientRectAsArray(anchor), getBoundingClientRectAsArray(targetPositionArea));
}, "anchor-positioned element using position-area in horizontal, right-to-left scroller");
test(() => {
const anchor = document.getElementById("anchor-2");
const targetAnchorFunction = document.getElementById("target-anchor-function-2");
assert_array_equals(getBoundingClientRectAsArray(anchor), getBoundingClientRectAsArray(targetAnchorFunction));
}, "anchor-positioned element using anchor() in vertical-rl scroller");
test(() => {
const anchor = document.getElementById("anchor-2");
const targetPositionArea = document.getElementById("target-position-area-2");
assert_array_equals(getBoundingClientRectAsArray(anchor), getBoundingClientRectAsArray(targetPositionArea));
}, "anchor-positioned element using position-area in vertical-rl scroller");
</script>
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