Print the size of the element once media is open in popup

functions.php

<?php

/**
 * Add script in the footer that will display size of the media when popup is opened.
 */
function tmp_rtm_wp_footer_display_size_of_lightbox() {
	?>
	<script type="text/javascript">
		jQuery(document).ready(function($) {
			// Fire when media is open in popup.
			rtMediaHook.register( 'rtmedia_js_popup_after_content_added', function() {
				// Fire after 0.5 second.
				setTimeout(function(){
					// Display height of the element 'rtmedia-media'.
					console.log( jQuery('.rtmedia-media').height() );

					// Display width of the element 'rtmedia-media'.
					console.log( jQuery('.rtmedia-media').width() );
				}, 500);
				return true;
			});
		});
	</script>
	<?php
}
add_action( 'wp_footer', 'tmp_rtm_wp_footer_display_size_of_lightbox', 10 );