<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: off-screen selection</title>
<link rel="author" title="Vladimir Levin" href="mailto:[email protected]">
<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;
background: lightblue;
}
#container {
background: lightgreen;
contain-intrinsic-size: 50px 100px;
content-visibility: auto;
}
#selectable {
width: 10px;
height: 10px;
}
</style>
<div class=spacer></div>
<div id=container>
<div id=selectable>hello</div>
</div>
<div class=spacer></div>
<script>
async_test((t) => {
const selection = window.getSelection();
const range = document.createRange();
range.selectNodeContents(selectable);
// Initially container should be 3000px offscreen with contained height 100px.
function step1() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_equals(r.y, 3000, "step1 offset");
assert_equals(r.height, 100, "step1 height");
});
selection.removeAllRanges();
selection.addRange(range);
requestAnimationFrame(step2);
}
// The container has a selection so it should be smaller now, height 10px.
function step2() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_equals(r.y, 3000, "step2 offset");
assert_equals(r.height, 10, "step2 height");
});
document.scrollingElement.scrollTop = 3000;
requestAnimationFrame(step3);
}
// After scrolling the container should be closer and still height 10px.
function step3() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_less_than(r.y, 3000, "step3 offset");
assert_equals(r.height, 10, "step3 height");
});
document.scrollingElement.scrollTop = 0;
requestAnimationFrame(step4);
}
// Scrolling back to the top we should remain at height 10px.
function step4() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_equals(r.y, 3000, "step4 offset");
assert_equals(r.height, 10, "step4 height");
});
requestAnimationFrame(step5);
}
// Repeat step4 to ensure we're in a stable situation.
function step5() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_equals(r.y, 3000, "step5 offset");
assert_equals(r.height, 10, "step5 height");
});
selection.removeAllRanges();
requestAnimationFrame(step6);
}
// After removing the selection, we keep the last rendered size, see
// https://github.com/w3c/csswg-drafts/issues/8407.
function step6() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_equals(r.y, 3000, "step6 offset");
assert_equals(r.height, 10, "step6 height");
});
t.done();
}
step1();
});
</script>
</html>
Codebase Browser
chromium