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<!doctype HTML>
<html>
<meta charset="utf8">
<title>Content Visibility: off-screen focus</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 focus.">
<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;
}
#focusable {
width: 10px;
height: 10px;
}
</style>
<div id=end tabindex=1></div>
<div class=spacer></div>
<div id=container>
<div id=focusable tabindex=0></div>
</div>
<div class=spacer></div>
<script>
async_test((t) => {
// 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");
});
focusable.focus();
step_timeout(step2, 0);
}
// After focusing the subtree, the container should be somewhere closer than
// 3000px (scrolled into view) and the height should be 10px, since it no
// longer has containment.
function step2() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_less_than(r.y, 3000, "step2 offset");
assert_equals(r.height, 10, "step2 height");
});
document.scrollingElement.scrollTop = 0;
requestAnimationFrame(step3);
}
// After scrolling the document back to the top, the container should be back
// at 3000px but because its subtree is still focused, it should have height
// 10px.
function step3() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_equals(r.y, 3000, "step3 offset");
assert_equals(r.height, 10, "step3 height");
});
requestAnimationFrame(step4);
}
// This is a repeat of step3, to ensure that this is a stable state.
function step4() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_equals(r.y, 3000, "step4 offset");
assert_equals(r.height, 10, "step4 height");
});
// We don't use `blur()` here because in Gecko this leaves the selection
// on _focusable_ which means that its content is still relevant. Focusing
// another element will move both focus and selection.
end.focus();
requestAnimationFrame(step5);
}
// After blurring the focused element, we keep the last rendered size, see
// https://github.com/w3c/csswg-drafts/issues/8407.
function step5() {
const r = container.getBoundingClientRect();
t.step(() => {
assert_equals(r.y, 3000, "step5 offset");
assert_equals(r.height, 10, "step5 height");
});
t.done();
}
step1();
});
</script>
</html>
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