LayoutTests/fast/text/word-space-with-kerning.html

<div style="font-size: 20px; font-family: ahem; -webkit-font-smoothing: none;">
    <div>
        <span style="word-spacing: 60px">a b c d </span> e
    </div>
    <div style="-webkit-font-kerning: normal;">
        <span style="word-spacing: 60px">a b c d </span> e
    </div>
</div>