Tabs to Accordions

functions.php

<?php

//* Enqueue scripts and styles
add_action( 'wp_enqueue_scripts', 'tabsalot_enqueue_scripts_styles' );
function tabsalot_enqueue_scripts_styles() {

	wp_enqueue_script( 'tabs-init' , get_stylesheet_directory_uri()  . '/js/tabs-init.js', array( 'tabsjs' ), '1', true );
	wp_enqueue_script( 'tabsjs' , get_stylesheet_directory_uri()  . '/js/jquery.responsiveTabs.js', array( 'jquery' ), '1', true );
	wp_enqueue_style( 'tabscss' , get_stylesheet_directory_uri()  . '/css/responsive-tabs.css', array(), '1.0.0', 'all' );
	wp_enqueue_style( 'dashicons' ); // for the + and - on the accordions

}

html.html

<div id="tabs1">
    <ul>
        <li><a href="#tab-1">this is the first link</a></li>
        <li><a href="#tab-2">this is the second link</a></li>
        <li><a href="#tab-3">this is the third link</a></li>
    </ul>
 
    <div id="tab-1">this is the first link content</div>
    <div id="tab-2">this is the second link content</div>
    <div id="tab-3">this is the third link content</div>
</div>

tabs-css.css

/* Tabs container */
.r-tabs {
        position: relative;
        background-color: #444;
        border-top: 1px solid #444;
        border-right: 1px solid #444;
        border-left: 1px solid #444;
        border-bottom: 4px solid #444;
        border-radius: 4px;
}

/* Tab element */
.r-tabs .r-tabs-nav .r-tabs-tab {
	position: relative;
	background-color: #444;
        display: inline-block;
        margin: 0;
        list-style: none;
}

/* Tab anchor */
.r-tabs .r-tabs-nav .r-tabs-anchor {
	display: inline-block;
	padding: 10px 12px;
	text-decoration: none;
	text-shadow: 0 1px rgba(0, 0, 0, 0.4);
	font-weight: bold;
	color: #fff;
        font-size: .9em;
}

/* Disabled tab */
.r-tabs .r-tabs-nav .r-tabs-state-disabled {
	opacity: 0.5;
}

/* Active state tab anchor */
.r-tabs .r-tabs-nav .r-tabs-state-active .r-tabs-anchor {
	color: #444;
	text-shadow: none;
	background-color: white;
	border-top-right-radius: 4px;
	border-top-left-radius: 4px;
}

/* Tab panel */
.r-tabs .r-tabs-panel {
	background-color: white;
	border-bottom: 4px solid white;
	border-bottom-right-radius: 4px;
	border-bottom-left-radius: 4px;
        padding: 15px;
        display: none;
}

/* Accordion anchor */
.r-tabs .r-tabs-accordion-title .r-tabs-anchor {
	display: block;
	padding: 10px;
	background-color: #444;
	color: #fff;
	font-weight: bold;
	text-decoration: none;
	text-shadow: 0 1px rgba(0, 0, 0, 0.4);
	border-top-right-radius: 4px;
	border-top-left-radius: 4px;
}

/* Active accordion anchor */
.r-tabs .r-tabs-accordion-title.r-tabs-state-active .r-tabs-anchor {
	background-color: #fff;
	color: #444;
	text-shadow: none;
}

/* Disabled accordion button */
.r-tabs .r-tabs-accordion-title.r-tabs-state-disabled {
	opacity: 0.5;
}

.r-tabs .r-tabs-nav {
        margin: 0;
        padding: 0;
}

.r-tabs .r-tabs-accordion-title {
        display: none;
}

.r-tabs .r-tabs-panel.r-tabs-state-active {
        display: block;
}

/* Accordion responsive breakpoint */
@media only screen and (max-width: 650px) { /* Set to desired media size for accordion layout */
        .r-tabs {
                border-radius: 0;
        }
        
        .r-tabs .r-tabs-nav {
                display: none;
        }
        
        .r-tabs .r-tabs-panel {
                border-bottom-right-radius: 0;
                border-bottom-left-radius: 0;
        }


        .r-tabs .r-tabs-accordion-title {
                display: block;
        }

        .r-tabs-accordion-title  .r-tabs-anchor:after {
                content: "\f132";
                font-family: 'dashicons';
                float: right;
        }

        .r-tabs-state-active .r-tabs-anchor:after {
                content: "\f460";
                font-family: 'dashicons';
                float: right;
        }

        .r-tabs .r-tabs-accordion-title .r-tabs-anchor {
                border-top-right-radius: 0;
                border-top-left-radius: 0;
        }
    
        .r-tabs .r-tabs-accordion-title.r-tabs-state-active .r-tabs-anchor {
                border-bottom: 1px solid;
        }
        
        .r-tabs .r-tabs-panel.r-tabs-state-active {
                display: block;
                opacity: 0.9;
        }
}

tabs-init.js

jQuery(function( $ ){
	  
	  $('#tabs1').responsiveTabs({
		   startCollapsed: 'accordion',
		   // Add other parameters
		});

});