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    span { display:inline-block; width:1em; }
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<p>Test that summary elements will always be blocks, even if attempted displayed as table-row, and
    that a spanner splitting it doesn't have any ill effects.</p>
<p>Below you should see 'PASS' three times. Letter spacing will vary.</p>
<span>P</span><span>A</span><span>S</span><span>S</span><br>
PASS<br>
<span>P</span><span>A</span><span>S</span><span>S</span><br>