When you developing a complex component by your own, one thing you cannot ignore is Accessibility.

Checkout this link. It lists all things you need to do regarding to accessibility when implements a complex component.

The tech we are using is: Roving Focus

Take radio group as an example, when doing roving focus, we set current focus element's:

tabindex = "0 " checked="checked"

And set other elements to:

tabindex="-1"
(function() {

  'use strict';

  // Define values for keycodes

  var VK_ENTER      = 13;

  var VK_SPACE      = 32;

  var VK_LEFT       = 37;

  var VK_UP         = 38;

  var VK_RIGHT      = 39;

  var VK_DOWN       = 40;

  // Helper function to convert NodeLists to Arrays

  function slice(nodes) {

    return Array.prototype.slice.call(nodes);

  }

  function RadioGroup(id) {

    this.el = document.querySelector(id);

    this.buttons = slice(this.el.querySelectorAll('.radio'));

    this.focusedIdx = 0;

    this.focusedButton = this.buttons[this.focusedIdx];

    this.el.addEventListener('keydown', this.handleKeyDown.bind(this));

  }

  RadioGroup.prototype.handleKeyDown = function(e) {

    switch(e.keyCode) {

      case VK_UP:

      case VK_LEFT: {

        e.preventDefault();

        // This seems like a good place to do some stuff :)

          if(this.buttons && this.buttons.length && this.focusedIdx > 0) {

              this.focusedIdx -= 1;

          } else if(this.buttons && this.buttons.length && this.focusedIdx === 0) {

              this.focusedIdx = this.buttons.length - 1;

          }

        break;

      }

      case VK_DOWN:

      case VK_RIGHT: {

        e.preventDefault();

        // This seems like a good place to do some stuff :)

          if(this.buttons && this.buttons.length && this.focusedIdx < this.buttons.length - 1) {

              this.focusedIdx += 1;

          } else if(this.buttons && this.buttons.length && this.focusedIdx === this.buttons.length - 1) {

              this.focusedIdx = 0;

          }

        break;

      }

    }

    this.changeFocus(this.focusedIdx); // <-- Hmm, interesting...

  };

  RadioGroup.prototype.changeFocus = function(idx) {

    // Set the old button to tabindex -1

    this.focusedButton.tabIndex = -1;

    this.focusedButton.removeAttribute('checked');

    // Set the new button to tabindex 0 and focus it

    this.focusedButton = this.buttons[idx];

    this.focusedButton.tabIndex = 0;

    this.focusedButton.focus();

    this.focusedButton.setAttribute('checked', 'checked');

  };

  var group1 = new RadioGroup('#group1');

}());
<!DOCTYPE html>

<html>

  <head>

    <meta charset="utf-8">

    <title></title>

    <meta name="description" content="">

    <meta name="viewport" content="width=device-width, initial-scale=1">

    <link rel="stylesheet" href="main.css">

  </head>

  <body>

    <div class="demo">

      <h3>Drink Options</h3>

      <ul id="group1" class="radiogroup">

        <li tabindex="0" class="radio" checked>

          Water

        </li>

        <li tabindex="-1" class="radio">

          Tea

        </li>

        <li tabindex="-1" class="radio">

          Coffee

        </li>

        <li tabindex="-1" class="radio">

          Cola

        </li>

        <li tabindex="-1" class="radio">

          Ginger Ale

        </li>

      </ul>

    </div>

    <script src="radiogroup.js"></script>

  </body>

</html>

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