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Test Info:

<!doctype html>
<meta charset=utf-8>
<title>:focus applies before scrolling into view</title>
<link href="" title="Emilio Cobos Álvarez">
<link href="" title="Mozilla">
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
body {
margin: 0;
.padding {
height: 200vh;
background-color: purple;
#focusable {
z-index: 0;
position: absolute;
top: 0;
left: 0;
#focusable:focus {
z-index: 1;
left: auto;
top: auto;
<div class="padding"></div>
<div id="focusable" tabindex=0>I am focusable</div>
<div class="padding"></div>
onload = function() {
async_test(function(t) {
let focusable = document.getElementById("focusable");
assert_equals(getComputedStyle(focusable).zIndex, "0", "focusable style is correct");
window.addEventListener("scroll", t.step_func_done(function(e) {
assert_equals(document.activeElement, focusable, "activeElement should be set");
assert_true(focusable.matches(":focus"), ":focus should match by the time we scroll");
assert_equals(getComputedStyle(focusable).zIndex, "1", "focusable style is correct");
}), { once: true });