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Test Info:

async_test(t => {
const input = document.body.appendChild(document.createElement("input"));
let happened = false;
input.onfocus = t.step_func(e => {
happened = true;
assert_equals(e.type, "focus");
assert_true(e.composed);
});
input.focus();
input.onblur = t.step_func_done(e => {
assert_true(happened);
assert_equals(e.type, "blur");
assert_true(e.composed);
});
input.blur();
}, "Focus events are composed");