<html> <body> <dl id="myDL"> <dt>Definition List:</dt> <dt>1.</dt><dd>Definition 1.</dd> <dt>2.</dt><dd>Definition 2.</dd> <dt>3</dt><dd>Definition 3.</dd> </dl> <button onclick="myDL.compact=true;">Compact</button> <button onclick="myDL.compact=false;">De-Compact</button> </body> </html>