Felix Triller

wpSpoiler is a plugin for WordPress, designed to protect the reader against spoilers, for example in book or filmreviews. 
The spoiler text is hidden by default and shows up if wished.
To mark a text as spoiler, enclose the passage with [spoiler] and [/spoiler].
Features
<ul>
<li>Very fast, less code</li>
<li>Customizeable with CSS</li>
</ul>
A german version of this page can be found <a href="http://felixtriller.de/projekte/wpspoiler/" title="felixtriller.de" rel="nofollow ugc">here</a>. 
Eine deutsche Version dieser Seite ist <a href="http://felixtriller.de/projekte/wpspoiler/" title="felixtriller.de" rel="nofollow ugc">hier</a> zu finden.
<h3>Usage</h3>
To mark a text as spoiler, enclose the passage with [spoiler] and [/spoiler]. 
Example: 
 Spoiler: [spoiler]Bruce Willis is a ghost![/spoiler]
The result is shown in the screenshot section.
<h3>Customize</h3>
The language of the link text has to be changed in the pluginfile itself: wpSpoiler.php.
CSS can be used to style the spoiler box and the links. The spoiler-div is identified by the classname <code>spoiler_div</code>. 
The link’s class is <code>spoiler_link_show</code> or <code>spoiler_link_hide</code>, depending on the current state.
An example stylesheet code snippet:
<pre><code>/* wpSpoiler */
a.spoiler_link_show,
a.spoiler_link_hide {
 background-repeat: no-repeat;
 background-position: left center;
 padding-left: 18px;
}
a.spoiler_link_show {
 background-image: url(images/add.png);
}
a.spoiler_link_hide {
 background-image: url(images/delete.png);
}
div.spoiler_div {
 background-color: #ddd;
 margin-top: -10px;
 padding: 2px;
}
</code></pre>

wpSpoiler

A plugin designed to protect the reader against spoilers.

Darshan Sawardekar

This plugin adds the shortcode <code>[spoiler]</code> to WordPress. Any content 
wrapped inside this shortcode is blurred out. It can be revealed by 
clicking on the blurred content.
The shortcode takes a <code>mode</code> parameter, which defaults to <code>block</code>. This 
wraps your content inside a div. To add spoilers that are inside to your 
text use the mode <code>inline</code>.
Eg:- Some [spoiler mode=’inline’]super secret stuff[/spoiler] here!
<h3>Credits</h3>
<ul>
<li>Inspired by the <a href="https://github.com/joshbuddy/spoiler-alert" rel="nofollow ugc">spoilerAlert</a> jQuery plugin by <a href="https://github.com/joshbuddy" rel="nofollow ugc">Joshua Hull</a></li>
</ul>

wp-spoiler-alert

Shortcode to hide Spoilers in your Posts.

wpSpoiler vs wp-spoiler-alert