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<!DOCTYPE html>
<html>
<head>
<style>
#outermost { border: 2px solid; }
#outer { border: 4px solid yellow; }
#inner { border: 6px sold green; }
</style>
</head>
<body>
<span id="outermost">
<span id="outer">
<span id="inner">
<span style="display: block"></span>
before span
<span style="display: block">span</span>
after span
</span>
</span>
</span>
</body>
</html>