chromium/third_party/blink/web_tests/fast/forms/select/select-baseline.html

<style>
.styledControl {
    background-color: lightblue;
    color: darkblue;
}
</style>
This tests that empty select controls and buttons have the correct baseline.<br>
<select>
    <option>
</select>
test
<select>
    <option>test
</select>
<select class="styledControl">
    <option>
</select>
test
<select class="styledControl">
    <option>test
</select>
<button></button>
<button>test</button>
<button class="styledControl"></button>
<button class="styledControl">test</button>