Create Spoiler on web pages

is a way to hide all or part of the contents of the blog content
Sample :

TITLE :

[SPOILER CONTENT]

The following code :
<div style="margin: 5px 20px 20px;"><div class="smallfont" style="margin-bottom: 2px;"><b>TITLE</b> : <input value="Show" style="margin: 0px; padding: 0px; width: 60px; font-size: 10px;" onclick="if (this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display != '') { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = ''; this.innerText = ''; this.value = 'Hide'; } else { this.parentNode.parentNode.getElementsByTagName('div')[1].getElementsByTagName('div')[0].style.display = 'none'; this.innerText = ''; this.value = 'Show'; }" type="button"> </div><br /><div class="alt2" style="margin: 0px; padding: 6px; border: 1px inset;"><div style="display:none;">[SPOILER CONTENT]</div></div></div><br />