Drupal Form API - Reset Button

I have come across a lot of discussions about how to add a reset button to a form in Drupal 7. Also it would be nice if when we added a reset button it didn't get a class of 'form-submit'. To get around this, rather than using standard method of adding a button to the render array of the form, most solutions opt for using #markup.
Using #markup enables you to add any HTML elements to a form. But the downside is that the form API doesn't know what your element is and nor will anyone else who may need to interact with it. It is better to use the form api to add a button and helpfully it has a #button-type, which defaults to form-submit but can be what ever you want.

<?php

// this would be in your Form Alter Hook

// Common suggestion.

$form['reset'] = array(
           '#markup' => '<input '. drupal_attributes(array('type' => 'reset', 'value' => t('Reset -') )) .' class="form-reset" />',
    );

// But you don't have to use markup to achieve this, you can do it like this:

$form['reset'] = array(
      '#type' => 'button',
      '#button_type' => 'reset',
      '#value' => t('Clear -'),
      '#weight' => 9,
      '#validate' => array(),
      '#attributes' => array(
            'onclick' => 'this.form.reset(); return false;',
          ),
    );

?>