It seems like some people aren't getting the message so, I'll draw a parallel in the hopes of adding the gravitas that the OP's question deserves. <div id="spoiler" style="display:none"> Nailed it. </div> <button title="Click to show/hide content" type="button" onclick="if(document.getElementById('spoiler') .style.display=='none') {document.getElementById('spoiler') .style.display=''}else{document.getElementById('spoiler') .style.display='none'}">Show/hide</button>