HTML5 introduced a bunch of new tags, one of which is . This element is a solution for a common UI component: a collapsible block. Almost every framework, including Bootstrap and jQuery UI, has its own plugin for a similar solution, but none conform to the HTML5 specification — probably because most were around long before got specified and, therefore, represent different approaches. A standard element allows everyone to use the same markup for a particular type of content. That’s why creating a robust polyfill makes sense 1 . Disclaimer : This is quite a technical article, and while I’ve tried to minimize the code snippets, the article still contains quite a few of them. So, be prepared! Existing Solutions Are Incomplete I’m not 2 the first person 3 to try to implement such a polyfill
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