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Test Info:

<!DOCTYPE html>
<link rel="help" href="http://crbug.com/374064162">
<style>
#test::before {
content: counters(counter0, '');
}
</style>
<div style="contain:style;">
<div style="counter-set:counter0;"></div>
</div>
<div id="test" style="contain:style;"></div>