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<title>word-spacing as percentages</title>
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div { font-size: 20px; line-height: 1; color: blue; }
small { font-size: 50%; }
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<p>Test passes if the pattern is identical on all four lines.
<div style="word-spacing: 1em">ABC123().*$いろはx x x፡x་x
<small style="word-spacing: 1em">ABC123().*$いろはx x x፡x་x</small></div>
<div style="word-spacing: 1em">ABC123().*$いろはx x x፡x་x
<small style="word-spacing: 1em">ABC123().*$いろはx x x፡x་x</small></div>
<div style="word-spacing: 1em">ABC123().*$いろはx x x፡x་x
<small style="word-spacing: 1em">ABC123().*$いろはx x x፡x་x</small></div>
<div style="word-spacing: 1em">ABC123().*$いろはx x x፡x་x
<small style="word-spacing: 1em">ABC123().*$いろはx x x፡x་x</small></div>