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<!DOCTYPE html> <html> <body> <p id="myP">This is a paragraph.</p> <select onchange="myFunction(this);" size="11"> <option>xx-small</option> <option>x-small</option> <option>small</option> <option>medium</option> <option>large</option> <option>x-large</option> <option>xx-large</option> <option>100%</option> <option>250%</option> <option>2cm</option> <option>100px</option> </select> <script> function myFunction(selectTag) { var listValue = selectTag.options[selectTag.selectedIndex].text; document.getElementById("myP").style.fontSize = listValue; } </script> </body> </html>