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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8>
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>focus() centers element outside displayport</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<style>
#container {
height: 25vh;
width: 100vw;
background: yellow;
overflow: auto;
white-space: nowrap;
}
.spacer {
width: 150vw;
height: 150vh;
background: green;
}
#target {
height: 5vh;
width: 5vw;
background: red;
margin: 0 auto;
}
#container > div {
display: inline-block;
}
</style>
</head>
<body>
<div id="container">
<div class="spacer"></div>
<!-- Center the target element -->
<div style="width: 5vw">
<div style="height: 70vh"></div>
<div tabindex=0 id="target"></div>
<div style="height: 70vh"></div>
</div>
<div class="spacer"></div>
</div>
</body>
<script>
function promiseFrame() {
return new Promise(resolve => {
requestAnimationFrame(() => requestAnimationFrame(() => resolve()));
});
}
promise_test(async (t) => {
let target = document.getElementById("target");
// Focus the element and record the scroll position
target.focus();
await promiseFrame();
let focusLeft = container.scrollLeft;
let focusTop = container.scrollTop;
container.scroll(0, 0);
// scrollIntoView the element and record the scroll position
target.scrollIntoView({block: "center", inline: "center"});
await promiseFrame();
let scrollLeft = container.scrollLeft;
let scrollTop = container.scrollTop;
// Ensure that both scroll positions are within +/- 1
assert_approx_equals(focusLeft, scrollLeft, 1.0,
"focus() inline direction is within +/- 1 of a centered scrollIntoView()");
assert_approx_equals(focusTop, scrollTop, 1.0,
"focus() block direction is within +/- 1 of a centered scrollIntoView()");
}, "Element.focus() center in both directions");
</script>
</html>
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