82 lines
2.1 KiB
HTML
82 lines
2.1 KiB
HTML
<!doctype html>
|
|
<title>Resnap to focused element after relayout</title>
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
<style>
|
|
|
|
#snapper {
|
|
counter-reset: child 0;
|
|
width: 200px;
|
|
scroll-snap-type: block mandatory;
|
|
overflow:hidden;
|
|
height: 100px;
|
|
}
|
|
.child {
|
|
width: 100px;
|
|
height: 100px;
|
|
background:red;
|
|
text-align: center;
|
|
box-sizing: border-box;
|
|
counter-increment: child;
|
|
float: left;
|
|
}
|
|
.child.f {
|
|
background: green;
|
|
scroll-snap-align: center;
|
|
}
|
|
.child::before {
|
|
content: counter(child);
|
|
}
|
|
|
|
</style>
|
|
|
|
<link rel=author title="Tab Atkins-Bittner" href="https://www.xanthir.com/contact/">
|
|
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap/#re-snap">
|
|
<!--
|
|
When re-snapping after a layout change,
|
|
if multiple elements were capable of being the snap target previously,
|
|
and one of them is focused,
|
|
you must resnap to the focused one.
|
|
-->
|
|
<div id=snapper>
|
|
<div class="child no-snap" tabindex=-1></div>
|
|
<div class=child></div>
|
|
<div class="child f" tabindex=-1></div>
|
|
<div class="child f" tabindex=-1></div>
|
|
<div class=child></div>
|
|
<div class=child></div>
|
|
</div>
|
|
|
|
<script>
|
|
|
|
var container = document.querySelector("#snapper");
|
|
var [one,two] = document.querySelectorAll(".child.f");
|
|
var unsnappable = document.querySelector(".child.no-snap");
|
|
|
|
async_test(t=>{
|
|
requestAnimationFrame(()=>{
|
|
testSnap(t, one, 3);
|
|
requestAnimationFrame(()=>{
|
|
testSnap(t, two, 4);
|
|
requestAnimationFrame(()=>{
|
|
testSnap(t, one, 3);
|
|
t.done();
|
|
});
|
|
});
|
|
});
|
|
});
|
|
|
|
function testSnap(t, child, expectedRow) {
|
|
t.step(()=>{
|
|
unsnappable.focus();
|
|
container.style.width = "200px";
|
|
var startingRow = container.scrollTop/100 + 1;
|
|
assert_equals(startingRow, 2, "Initially snapped to row 2");
|
|
child.focus();
|
|
container.style.width = "100px";
|
|
var endingRow = container.scrollTop/100 + 1;
|
|
assert_equals(endingRow, expectedRow, `After resize, should snap to row ${expectedRow}.`);
|
|
});
|
|
}
|
|
|
|
</script>
|