* `HowtoAccordion` is a container element for headings and panels. * * Each heading must be a `<howto-accordion-heading>`. Each panel must be a

* `HowtoAccordionHeading` is the element for the headings in the accordion. * Accordion to the WAI ARIA Best Practices, each heading needs to wrap

* `HowtoAccordionPanel` is the element for the expandable and collapsible * content. Accordion to the WAI ARIA Best Practices, each panel should be

* `HowtoPanel` is a panel for a `<howto-tabs>` tab panel.

* `HowtoRadioButton` is a simple, checkable button.

* `HowtoRadioGroup` is responsible for handling user input, and updating the * state of its `HowtoRadioButton` children. It uses the [roving * t

* `HowtoTabsTab` is a tab for a `<howto-tabs>` tab panel. `<howto-tab>` * should always be used with `role=heading` in the markup so that the *

* `HowtoTabs` is a container element for tabs and panels. * * All children of `<howto-tabs>` should be either `<howto-tab>` or * `<howto-tabp

* Copyright 2017 Google Inc. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file e