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<!DOCTYPE html>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<style>
:root {
background-color: red;
}
</style>
<button>Turn green</button>
<script>
test_driver.set_test_context(parent);
const button = document.querySelector("button");
button.addEventListener("click", () => {
button.remove();
document.documentElement.style.backgroundColor = "green";
test_driver.message_test("done");
});
test_driver.click(button);
</script>