[WordPress] How to use the WordPress Theme Customizer, JavaScript, and `get_theme_mod` in order to toggle the visibility of an element.

conditionally-show-element-with-class.js

wp.customize( 'acme_display_element', function( value ) {
	
	value.bind( function( to ) {

		if ( true === to ) {
			$( '#element' ).removeClass( 'hidden' );
		} else {
			$( '#element' ).addClass( 'hidden' );
		}

	});
	
});

conditionally-show-element-with-class.php

<?php $visibility = ( '1' == get_theme_mod( 'acme_display_element' ) ) ? 'hidden' : '' ?>
<div id="element" class="<?php echo $visibility; ?>">
  <img src="acme.png" alt="Acme Image" />
</div><!-- #avatar -->

conditionally-show-element.php

<?php if ( '1' == get_theme_mod( 'acme_display_element' ) ) { ?>
  <div id="element">
    <img src="acme.png" alt="Acme Image" />
  </div><!-- #element -->
<?php } ?>