[Kirk Y]

Here's one that you have to highlight the text... I've seen a clickable one, but am having trouble locating it again.

Title: Spoiler
Tag: spoiler
Replacement: <div style="margin:20px; margin-top:5px">
<div class="smallfont">Spoiler: (<i>Highlight this box to see the hidden message.</i>)</i></div></font>
<pre class="alt2" style="margin:0px; padding:$stylevar[cellpadding]px; border:1px inset; width:$stylevar[codeblockwidth]; height:{$blockheight}px; overflow:auto"><div dir="ltr" style="text-align:left;"><table bgcolor=#E1E4F2><tr><td><font color=#E1E4F2>{param}</font></td></tr></table></div></pre>
</div>
Example: Here's how the movie ends: [spoiler]The butler did it![/spoiler]
Description: The [spoiler] tag allows text to be hidden until the reader highlights the spoiler box to reveal the text.
Use {option} = no

Here's one that requires you to mouseover a blacked out spot to reveal the text, or spoiler as the case may be.
https://vborg.vbsupport.ru/showthread.php?t=77917&highlight=spoiler