I am using the plugin "JQuery Collapse-O-Matic" to let the reader expand or collapse parts of my posts...
The documentation is available on the author's website. As you can see, there are a lot of options to manage groups, scrolling, colors, pictures, etc, etc, etc...
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[expand title="Click to Read More" swaptitle="Click to Close"]
I found, so far, once issue with the "WordPress 2012" theme I am using:
- When there is no content anymore after the closing tag, there is no space left between the collapsed block and the bottom line of the post.
- If there is one blank line after the closing tag, there is a huge space (several lines) displayed between the collapsed block and the bottom line of the post.
- if the opening tag to expand/collapse the block is not at the beginning of the line, i.e.: if there are some text in front of it.
- if the previous line is not the last one of a paragraph. I.e.: if it ends with a simple line break (Shift-Enter) instead of a end-of-paragraph (Enter).
Copy the code here above and paste it into your post with Ctrl-Shift-V, to paste-in-plain-text (without formatting!)