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<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: off-screen selection</title>
<link rel="author" title="Vladimir Levin" href="mailto:vmpstr@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-contain/#content-visibility">
<meta name="assert" content="content-visibility auto element remains non-skipped when elements in its subtree have selection.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
body, html {
padding: 0;
margin: 0;
}
.spacer {
height: 3000px;
}
.container {
width: 10px;
contain-intrinsic-size: 10px 20px;
content-visibility: auto;
}
.child {
width: 10px;
height: 10px;
}
</style>
<div class=spacer></div>
<div id=container_1 class=container><div id=child_1 class=child>hello</div></div>
<div id=container_2 class=container><div id=child_2 class=child>hello</div></div>
<div id=container_3 class=container><div id=child_3 class=child>hello</div></div>
<div id=container_4 class=container><div id=child_4 class=child>hello</div></div>
<div id=container_5 class=container><div id=child_5 class=child>hello</div></div>
<script>
function isLocked(container) {
const height = container.getBoundingClientRect().height;
assert_true(height == 20 || height == 10);
return container.getBoundingClientRect().height == 20;
}
const selection = window.getSelection();
function resetSelection() {
selection.removeAllRanges();
assert_true(isLocked(container_1));
assert_true(isLocked(container_2));
assert_true(isLocked(container_3));
assert_true(isLocked(container_4));
assert_true(isLocked(container_5));
}
test(() => {
resetSelection();
const range = document.createRange();
range.selectNodeContents(child_2);
selection.addRange(range);
assert_true(isLocked(container_1), "1");
assert_false(isLocked(container_2), "2");
assert_true(isLocked(container_3), "3");
assert_true(isLocked(container_4), "4");
assert_true(isLocked(container_5), "5");
}, "One elements selected: ");
test(() => {
resetSelection();
const range = document.createRange();
range.selectNodeContents(child_2);
selection.addRange(range);
assert_true(isLocked(container_1), "1");
assert_false(isLocked(container_2), "2");
assert_true(isLocked(container_3), "3");
assert_true(isLocked(container_4), "4");
assert_true(isLocked(container_5), "5");
selection.extend(child_4, 0);
assert_true(isLocked(container_1), "1");
assert_false(isLocked(container_2), "2");
assert_false(isLocked(container_3), "3");
assert_false(isLocked(container_4), "4");
assert_true(isLocked(container_5), "5");
}, "Range extended to cover more elements: ");
test(() => {
resetSelection();
const range = document.createRange();
range.setStart(child_2, 0);
range.setEnd(child_4, 0);
selection.addRange(range);
assert_true(isLocked(container_1), "1");
assert_false(isLocked(container_2), "2");
assert_false(isLocked(container_3), "3");
assert_false(isLocked(container_4), "4");
assert_true(isLocked(container_5), "5");
selection.extend(child_2, 1);
assert_true(isLocked(container_1), "1");
assert_false(isLocked(container_2), "2");
assert_true(isLocked(container_3), "3");
assert_true(isLocked(container_4), "4");
assert_true(isLocked(container_5), "5");
}, "Range shrunk to cover fewer elements: ");
test(() => {
resetSelection();
const range = document.createRange();
range.setStart(child_3, 0);
range.setEnd(child_3, 0);
selection.addRange(range);
selection.extend(child_2, 0);
assert_true(isLocked(container_1), "1");
assert_false(isLocked(container_2), "2");
assert_false(isLocked(container_3), "3");
assert_true(isLocked(container_4), "4");
assert_true(isLocked(container_5), "5");
selection.extend(child_4, 0);
assert_true(isLocked(container_1), "1");
assert_true(isLocked(container_2), "2");
assert_false(isLocked(container_3), "3");
assert_false(isLocked(container_4), "4");
assert_true(isLocked(container_5), "5");
}, "Range flipped from back to front: ");
test(() => {
resetSelection();
const range = document.createRange();
range.setStart(child_3, 0);
range.setEnd(child_4, 0);
selection.addRange(range);
assert_true(isLocked(container_1), "1");
assert_true(isLocked(container_2), "2");
assert_false(isLocked(container_3), "3");
assert_false(isLocked(container_4), "4");
assert_true(isLocked(container_5), "5");
selection.extend(child_2, 0);
assert_true(isLocked(container_1), "1");
assert_false(isLocked(container_2), "2");
assert_false(isLocked(container_3), "3");
assert_true(isLocked(container_4), "4");
assert_true(isLocked(container_5), "5");
}, "Range flipped from front to back: ");
test(() => {
resetSelection();
const range = document.createRange();
range.setStart(child_1, 0);
range.setEnd(child_1, 0);
selection.addRange(range);
let state = 0;
const states = [2, 4, 3, 5, 1];
for (let i = 0; i < 10; ++i) {
const id = states[state];
selection.extend(document.getElementById(`child_${id}`), 1);
for (let check_id = 1; check_id <= 5; ++check_id) {
if (check_id <= id) {
assert_false(
isLocked(document.getElementById(`container_${check_id}`)),
`test_${i}, container_${check_id}`);
} else {
assert_true(
isLocked(document.getElementById(`container_${check_id}`)),
`test_${i}, container_${check_id}`);
}
}
state = (state + 1) % states.length;
}
}, "Range goes back and forth: ");
</script>
</html>
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