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<!DOCTYPE html>
<html>
<title>Tests that when an anchor name is mutated, the anchor-positioned element adjusts to the new anchor</title>
<link rel="author" href="mailto:kiet.ho@apple.com">
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#name">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/common/rendering-utils.js"></script>
<style>
.containing-block {
position: relative;
width: 300px;
height: 300px;
border: 1px black solid;
}
.cell {
width: 100px;
height: 100px;
}
#anchor-1 {
position: absolute;
top: 0;
left: 0;
background: green;
}
#anchor-2 {
position: absolute;
top: 100px;
left: 0;
background: blue;
}
.anchor {
anchor-name: --anchor;
}
#anchor-positioned {
background: orange;
position: absolute;
top: 0;
left: 0;
}
.positioned-using-anchor-function-explicit-name {
position: absolute;
top: anchor(--anchor bottom) !important;
left: anchor(--anchor right) !important;
}
.positioned-using-anchor-function-implicit-name {
position: absolute;
position-anchor: --anchor;
top: anchor(bottom) !important;
left: anchor(right) !important;
}
.positioned-using-position-area {
position: absolute;
position-anchor: --anchor;
position-area: bottom right;
}
</style>
<body>
<main id="main">
</main>
<template id="test-template">
<div class="containing-block">
<div class="cell" id="anchor-1"></div>
<div class="cell" id="anchor-2"></div>
<div class="cell" id="anchor-positioned"></div>
</div>
</template>
<script>
function inflate(t, template_element) {
const main_element = document.getElementById("main");
t.add_cleanup(() => main_element.replaceChildren());
main_element.append(template_element.content.cloneNode(true));
}
const test_template = document.getElementById("test-template");
const positioning_methods = [
"positioned-using-anchor-function-explicit-name",
"positioned-using-anchor-function-implicit-name",
"positioned-using-position-area"
]
for (let positioning_method of positioning_methods) {
promise_test(async (t) => {
inflate(t, test_template);
const anchor1 = document.getElementById("anchor-1");
const anchorPositioned = document.getElementById("anchor-positioned");
anchorPositioned.classList.add(positioning_method);
// Here, anchorPositioned should be at the default location (top-left of containing block)
// This is because the anchor elements don't have an anchor name yet.
assert_equals(anchorPositioned.offsetTop, 0);
assert_equals(anchorPositioned.offsetLeft, 0);
anchor1.classList.add("anchor");
// Here, anchorPositioned should be bottom-right of anchor1
assert_equals(anchorPositioned.offsetTop, 100);
assert_equals(anchorPositioned.offsetLeft, 100);
}, `Tests when an anchor-name is added later ${positioning_method}`);
promise_test(async (t) => {
inflate(t, test_template);
const anchor1 = document.getElementById("anchor-1");
const anchorPositioned = document.getElementById("anchor-positioned");
anchor1.classList.add("anchor");
anchorPositioned.classList.add(positioning_method);
// Here, anchorPositioned should be bottom-right of anchor1
assert_equals(anchorPositioned.offsetTop, 100);
assert_equals(anchorPositioned.offsetLeft, 100);
anchor1.classList.remove("anchor");
// Here, anchorPositioned should be at the default location (top-left of containing block)
// This is because the anchor elements don't have an anchor name.
assert_equals(anchorPositioned.offsetTop, 0);
assert_equals(anchorPositioned.offsetLeft, 0);
}, `Tests when an anchor-name is removed later ${positioning_method}`);
promise_test(async (t) => {
inflate(t, test_template);
const anchor1 = document.getElementById("anchor-1");
const anchor2 = document.getElementById("anchor-2");
const anchorPositioned = document.getElementById("anchor-positioned");
anchor1.classList.add("anchor");
anchorPositioned.classList.add(positioning_method);
// Here, anchorPositioned should be bottom-right of anchor1
assert_equals(anchorPositioned.offsetTop, 100);
assert_equals(anchorPositioned.offsetLeft, 100);
anchor1.classList.remove("anchor");
anchor2.classList.add("anchor");
// Here, anchorPositioned should be bottom-right of anchor2
assert_equals(anchorPositioned.offsetTop, 200);
assert_equals(anchorPositioned.offsetLeft, 100);
}, `Tests when an anchor-name moves from one element to another ${positioning_method}`);
promise_test(async (t) => {
inflate(t, test_template);
const anchor1 = document.getElementById("anchor-1");
const anchor2 = document.getElementById("anchor-2");
const anchorPositioned = document.getElementById("anchor-positioned");
anchor1.classList.add("anchor");
anchorPositioned.classList.add(positioning_method);
// Here, anchorPositioned should be bottom-right of anchor1
assert_equals(anchorPositioned.offsetTop, 100);
assert_equals(anchorPositioned.offsetLeft, 100);
anchor2.classList.add("anchor");
// Here, anchorPositioned should be bottom-right of anchor2
assert_equals(anchorPositioned.offsetTop, 200);
assert_equals(anchorPositioned.offsetLeft, 100);
}, `Tests when a new anchor candidate is added (which wins out previous anchor) ${positioning_method}`);
promise_test(async (t) => {
inflate(t, test_template);
const anchor1 = document.getElementById("anchor-1");
const anchor2 = document.getElementById("anchor-2");
const anchorPositioned = document.getElementById("anchor-positioned");
anchor2.classList.add("anchor");
anchorPositioned.classList.add(positioning_method);
// Here, anchorPositioned should be bottom-right of anchor2
assert_equals(anchorPositioned.offsetTop, 200);
assert_equals(anchorPositioned.offsetLeft, 100);
anchor1.classList.add("anchor");
// Here, anchorPositioned should be bottom-right of anchor2
assert_equals(anchorPositioned.offsetTop, 200);
assert_equals(anchorPositioned.offsetLeft, 100);
}, `Tests when a new anchor candidate is added (which loses out previous anchor) ${positioning_method}`);
}
</script>
</body>
</html>
|
