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Test Info: Warnings

<!doctype html>
<meta charset="utf-8">
<title>CSS Test: disabled ::scroll-button() shouldn't be focusable</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
div::scroll-button(inline-start) {
content: "";
background-color: green;
}
div::scroll-button(inline-start):focus {
background-color: red;
}
</style>
<div id="target"></div>
<script>
promise_test(async t => {
const kTab = '\uE004';
await new test_driver.Actions()
.keyDown(kTab)
.keyUp(kTab)
.send();
assert_equals(getComputedStyle(target, "::scroll-button(inline-start)").backgroundColor, "rgb(0, 128, 0)");
});
</script>