File: show-picker-being-rendered.html

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<!DOCTYPE html>
<title>Test showPicker() being rendered requirement</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<select id="select" style="display: none;">
    <option>Item 1</option>
</select>
<script>
promise_test(async t => {
    await test_driver.bless('show picker');
    assert_throws_dom('NotSupportedError', () => { select.showPicker(); });

    // Test that dynamically changing to actually being rendered works.
    await test_driver.bless('show picker');
    select.style.display = 'inline-block';
    select.showPicker();
    select.blur();
}, 'select showPicker() throws when not being rendered');
</script>