Скрипт Javascript не загружается на сайте Wordpress

Итак, я буквально скопировал код из https://codepen.io/hellokatili/pen/rVvMZb (HTML в шаблоне, CSS в styles.css и JS с использованием этого плагина https://wordpress.org/plugins/header-and-footer-scripts/)

Я добавил JS-скрипт в теги.

Вот приведенный выше код из codepen (после преобразования из HAML в HTML и SCSS в CSS).

HTML:

  > <div class = "content">   
          <script type = "text/javascript"> </script>
              <div class = "slider single-item">
    >     <div class = "quote-container">
    >       <div class = "portrait octogon">
    >         <img src = "http://www.tuacahntech.com/uploads/6/1/7/9/6179841/6166205_orig.jpg"/>
    >       </div>
    >       <div class = "quote">
    >         <blockquote>
    >           <p>Meditation shabby chic master cleanse banh mi Godard. Asymmetrical Wes Anderson Intelligentsia you probably haven't heard of
    > them.</p>
    >           <cite>
    >             <span>Kristi McSweeney</span>
    >             <br/>
    >             Thundercats twee
    >             <br/>
    >             Austin selvage beard
    >           </cite>
    >         </blockquote>
    >       </div>
    >     </div>
    >     <div class = "quote-container">
    >       <div class = "portrait octogon">
    >         <img src = "http://static1.squarespace.com/static/51579fb2e4b0fc0d9469ff97/56cc83dfe707ebc39cf3269f/56d0b59e27d4bde4665fded3/1457365822199/"/>
    >       </div>
    >       <div class = "quote">
    >         <blockquote>
    >           <p>Bespoke occupy cred seitan. Austin street art freegan Truffaut leggings aesthetic, salvia chia Brooklyn flexitarian.
    > Single-origin coffee before they sold out health goth, cornhole irony
    > keffiyeh Austin taxidermy mlkshk blog trust fund banh mi you probably
    > haven't heard of them.</p>
    >           <cite>
    >             <span>Dina Anderson</span>
    >             <br/>
    >             Blue Bottle keffiyeh
    >             <br/>
    >             Sartorial locavore Schlitz ennui
    >           </cite>
    >         </blockquote>
    >       </div>
    >     </div>   </div> </div> <svg>   <defs>
    >     <clipPath clipPathUnits = "objectBoundingBox" id = "octogon">
    >       <polygon points = "0.50001 0.00000, 0.61887 0.06700, 0.75011 0.06721, 0.81942 0.18444, 0.93300 0.25001, 0.93441 0.38641, 1.00000 0.49999, 0.93300 0.61887, 0.93300 0.75002, 0.81556 0.81944, 0.74999 0.93302, 0.61357 0.93444, 0.50001 1.00000, 0.38118 0.93302, 0.24998 0.93302, 0.18056 0.81556, 0.06700 0.74899, 0.06559 0.61359, 0.00000 0.49999, 0.06700 0.38111, 0.06700 0.25001, 0.18440 0.18058, 0.25043 0.06700, 0.38641 0.06559, 0.50001 0.00000"></polygon>
    >     </clipPath>   </defs> </svg>

CSS:

html {
  height: 100%;
}
body {
  background: linear-gradient(130deg, #1abc9c, #d1f2eb);
  background-size: 400% 400%;
  -webkit-animation: gradient 16s ease infinite;
  -moz-animation: gradient 16s ease infinite;
  animation: gradient 16s ease infinite;
}
.content {
  margin: auto;
  padding: 20px;
  width: 80%;
  max-width: 1200px;
  min-width: 300px;
}
.slick-slider {
  margin: 30px auto 50px;
}
.slick-prev, .slick-next {
  color: white;
  opacity: 1;
  height: 40px;
  width: 40px;
  margin-top: -20px;
}
.slick-prev path, .slick-next path {
  fill: rgba(255, 255, 255, 0.4);
}
.slick-prev:hover path, .slick-next:hover path {
  fill: #fff;
}
.slick-prev {
  left: -35px;
}
.slick-next {
  right: -35px;
}
.slick-prev:before, .slick-next:before {
  content: none;
}
.slick-dots li button:before {
  color: rgba(255, 255, 255, 0.4);
  opacity: 1;
  font-size: 8px;
}
.slick-dots li.slick-active button:before {
  color: #fff;
}
.quote-container {
  min-height: 200px;
  color: #666;
  font-size: 36px;
  margin: 0 20px;
  position: relative;
}
.quote-container:hover {
  cursor: grab;
}
.quote-container .portrait {
  position: absolute;
  top: 0;
  bottom: 0;
  margin: auto;
  height: 140px;
  width: 140px;
  overflow: hidden;
}
.quote-container .portrait img {
  display: block;
  height: auto;
  width: 100%;
}
.quote-container .quote {
  position: relative;
  z-index: 600;
  padding: 40px 0 40px 180px;
  margin: 0;
  font-size: 20px;
  font-style: italic;
  line-height: 1.4 !important;
  font-family: Calibri;
  color: white;
}
.quote-container .quote p {
  position: relative;
  margin-bottom: 20px;
}
.quote-container .quote p:first-child:before {
  content: '\201C';
  color: rgba(255, 255, 255, 0.44);
  font-size: 7.5em;
  font-weight: 700;
  opacity: 1;
  position: absolute;
  top: -0.4em;
  left: -0.2em;
  text-shadow: none;
  z-index: -10;
}
.quote-container .quote cite {
  display: block;
  font-size: 14px;
}
.quote-container .quote cite span {
  font-size: 16px;
  font-style: normal;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.dragging .quote-container {
  cursor: grabbing;
}
.octogon {
  -webkit-clip-path: polygon(50% 0%, 38.11% 6.7%, 24.99% 6.72%, 18.06% 18.44%, 6.7% 25%, 6.56% 38.64%, 0% 50%, 6.7% 61.89%, 6.7% 75%, 18.44% 81.94%, 25% 93.3%, 38.64% 93.44%, 50% 100%, 61.88% 93.3%, 75% 93.3%, 81.94% 81.56%, 93.3% 74.9%, 93.44% 61.36%, 100% 50%, 93.3% 38.11%, 93.3% 25%, 81.56% 18.06%, 74.96% 6.7%, 61.36% 6.56%, 50% 0%);
  clip-path: url(#octogon);
  height: 140px;
  width: 140px;
}
@-webkit-keyframes gradient {
  0% {
    background-position: 5% 0%;
  }
  50% {
    background-position: 96% 100%;
  }
  100% {
    background-position: 5% 0%;
  }
}
@-moz-keyframes gradient {
  0% {
    background-position: 5% 0%;
  }
  50% {
    background-position: 96% 100%;
  }
  100% {
    background-position: 5% 0%;
  }
}
@keyframes gradient {
  0% {
    background-position: 5% 0%;
  }
  50% {
    background-position: 96% 100%;
  }
  100% {
    background-position: 5% 0%;
  }
}

JS:

var prevButton = '<button type = "button" data-role = "none" class = "slick-prev" aria-label = "prev"><svg xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24" version = "1.1"><path fill = "#FFFFFF" d = "M 16,16.46 11.415,11.875 16,7.29 14.585,5.875 l -6,6 6,6 z" /></svg></button>',
    nextButton = '<button type = "button" data-role = "none" class = "slick-next" aria-label = "next"><svg version = "1.1" xmlns = "http://www.w3.org/2000/svg" viewBox = "0 0 24 24"><path fill = "#FFFFFF" d = "M8.585 16.46l4.585-4.585-4.585-4.585 1.415-1.415 6 6-6 6z"></path></svg></button>';

$('.single-item').slick({
  infinite: true,
  dots: true,
  autoplay: true,
  autoplaySpeed: 4000,
  speed: 1000,
  cssEase: 'ease-in-out',
  prevArrow: prevButton,
  nextArrow: nextButton
});

$('.quote-container').mousedown(function(){
  $('.single-item').addClass('dragging');
});
$('.quote-container').mouseup(function(){
  $('.single-item').removeClass('dragging');
});

Часть HTML и CSS работает нормально, но JS не работает. Я использую другой сценарий JS на том же сайте WP, и он отлично работает. Что мне не хватает?