Snippet for custom breadcrumbs in checkout of a Shopify Plus store.

checkout-breadcrumbs.liquid

{% if content_for_layout contains 'data-step="contact_information"' %}
<ul class="bc">
  <a href="/cart">
    <li class="bc_item bc_complete">Cart</li>
  </a>
  <li class="bc_item bc_current">Customer Information</li>
  <li class="bc_item">Shipping Method</li>
  <li class="bc_item">Payment Method</li>
</ul>

{% elsif content_for_layout contains 'data-step="shipping_method"' %}
<ul class="bc">
  <a href="/cart">
    <li class="bc_item bc_complete">Cart</li>
  </a> 
  <a href="/cart/checkout?step=contact_information">
    <li class="bc_item bc_complete">Customer Information</li>
  </a>
  <li class="bc_item bc_current">Shipping Method</li>
  <li class="bc_item">Payment Method</li>
</ul>

{% elsif content_for_layout contains 'data-step="payment_method"' %}
<ul class="bc">
  <a href="/cart">
    <li class="bc_item bc_complete">Cart</li>
  </a>
  <a href="/cart/checkout?step=contact_information">
    <li class="bc_item bc_complete">Customer Information</li>
  </a>
  <a href="/cart/checkout?step=shipping_method">
    <li class="bc_item bc_complete">Shipping Method</li>
  </a>
  <li class="bc_item bc_current">Payment Method</li>
</ul>

{% elsif content_for_layout contains 'data-step="review"' %}
<ul class="bc">
  <a href="/cart">
    <li class="bc_item bc_complete">Cart</li>
  </a>
  <a href="/cart/checkout?step=contact_information">
    <li class="bc_item bc_complete">Customer Information</li>
  </a>
  <a href="/cart/checkout?step=shipping_method">
    <li class="bc_item bc_complete">Shipping Method</li>
  </a>
  <a href="/cart/checkout?step=payment_method">
    <li class="bc_item bc_complete">Payment Method</li>
  </a>
</ul>
{% endif %}

{% assign background = '#FDFBF1' %}
{% assign green = '#313E2E' %}
{% assign orange = '#ff692e' %}
        
{% style %}

  .bc {
    margin: 15px 0 0;
    padding: 0px;
    list-style-type: none;
    width: 100%;
    max-width: 800px;
    height: 120px;
    counter-reset: breadcrumb;
    position: relative;
  }
  .bc:before {
    position: absolute;
    top: 23px;
    left: 12.5%;
    content: '';
    width: 75%;
    height: 1px;
    background: {{ green }};
  }
  .bc .bc_item {
    float: left;
    padding-top: 60px;
    width: 25%;
    text-align: center;
    position: relative;
  }
  .bc .bc_item:after {
    counter-increment: breadcrumb;
    content: counter(breadcrumb);
    position: absolute;
    top: 0px;
    left: calc(50% - 23px);
    width: 40px;
    height: 40px;
    text-align: center;
    border: 3px solid {{ green }};
    border-radius: 50%;
    line-height: 40px;
    background: {{ background }};
  }
  .bc .bc_current:after {
    background: {{ orange }};
    border-color: {{ orange }};
    color: white;
  }

  .bc .bc_complete:after {
    background: {{ green }};
    color: white;
  }

{% endstyle %}