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<!DOCTYPE html>
<p>Pass if no crash</p>
<div id="pop" style="position-try-fallbacks: --foo" popover></div>
<script>
getComputedStyle(pop).left;
</script>
<!DOCTYPE html>
<p>Pass if no crash</p>
<div id="pop" style="position-try-fallbacks: --foo" popover></div>
<script>
getComputedStyle(pop).left;
</script>