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Details, details.

This is a feature test and polyfill for the HTML5 details/summary markup pattern, with a couple of extras:

  • Allows you to expand and collapse the details content above/below specified screen sizes
  • Adds keyboard navigation and toggling
  • Adds a bunch of ARIA goodness

Using the open attribute to default details to open/closed works as expected, naturally. To have an element only open above/below a certain size, each details element accepts a data-media attribute with a good ol’ fashioned media query in it.

I’ve included a shim for indexOf and matchMedia, both of which are required for the breakpoint behavior.

In the event that JavaScript is disabled or otherwise unavailable and details isn’t natively supported, the summary elements will simply behave like headings and all the content will be available.

It should be noted that mathiasbynens has a simple and especially robust jQuery-based test/polyfill for this markup, as well.

Updates to come, and here is a demo.