Adds fallback support for the HTML5
<details> and <summary> elements in browsers that don't support them using
Mathias Bynens' <details>/<summary> jQuery plugin.
Once the plugin is activated on your site, the following HTML should work in all modern browsers, even if they don't natively support the <details> and <summary> elements:
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Click for more info...
This is where you'd add the additional content that won't be seen until the "summary" is clicked.
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Extract the zip file and drop the contents in the wp-content/plugins/ directory of your WordPress installation and then activate the plugin from the "Plugins" page.