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chromium/third_party/blink/web_tests/fast/block/containing-block-change-percentage-padding-width-recalc-expected.html 

<!DOCTYPE html>
<style>
#dynamic-container {
    width: 500px;
}
#percentage-padding {
    position: absolute;
    padding: 10%;
}
</style>
<div id='dynamic-container'>
    <div id='percentage-padding'>
        There should be no line break.
    </div>
</div>