Jonas Hjalmarsson

A single shortcode you can drop into any post, page, or text widget to get a click-to-expand “read more” toggle. The output is a native HTML <code><details></code> element styled with a small inline stylesheet — nothing else.
The point is the absence of features. There is no settings page, no animation library, no editor block panel with twelve toggles. If you need a read-more on one paragraph in one post, you do not want a plugin that wants to manage your whole site.
Usage:
<pre><code>[expand title="My title"]
The content goes here.
<img src="even-images-can-go-in-here.jpg" />
And wrap up with a closing expand tag.
[/expand]
</code></pre>
Supports a custom CSS class via <code>[expand class="my-class"]</code> and works with WordPress oEmbeds and other shortcodes nested inside.

Simple Expand – Lightweight Read more toggle

Adds an [expand] shortcode that wraps content in a native HTML `` toggle. No JavaScript, no settings page, no bloat.

pluspt2001

Show Hide Centent plugin hides your content behind a Read More button. Your hidden content is revealed dynamically on the same page on clicking the readmore floating button.
What does it do
<ul>
<li>Floating readmore button over your hidden text or text and images both.</li>
<li>Pressing readmore button reveals the content on the same page</li>
</ul>
How to Use and Install
<ul>
<li>Activate plugin</li>
<li>Go to the edit screen of a page where your data to be hidden is.</li>
<li>Go to visual tab</li>
<li>Select the content you want to conceal behind a readmore button</li>
<li>Click on the orange button on the editor window. And you are done , the shortcode will wrap around your text.</li>
<li>Do the same for all your content that needs to be hidden.</li>
<li>once done. Save, publish and you are done !</li>
</ul>
About
The Show Hide Centent plugin is maintained by http://wordpresshowtos.blogspot.com/2015/10/show-hide-content-plugin.html

Show Hide Content

Show Hide Content plugin hides your selected content behind a Read more button.

Simple Expand – Lightweight Read more toggle vs Show Hide Content