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HTML

              
                <div class="layout">
  <div class="warning">
    <strong>Warning:</strong> Your browser does not support CSS container queries. Please open this demo in Chrome
    Canary with the experimental <i>#enable-container-queries</i> flag turned on or in Safari Technology Preview.
  </div>
  <header class="header">
    <div class="header__brand">
      <a href="/">Peter's 'puters</a>
    </div>
    <div class="header__cart">
      <shopping-cart-toggle>
        <span slot="toggle">Open shopping cart</span>
        <shopping-cart slot="content"></shopping-cart>
      </shopping-cart-toggle>
    </div>
  </header>
  <main>
    <h1>Shopping Cart</h1>
    <p style="max-width: 1000px;">In this CodePen, the shopping cart product list is a Web Component that is both used in the large page view as in the small dropdown toggled by the <em>Open Shopping Cart</em> button at the top right. Thanks to Container Queries, we can reuse a single component and style it according to it's parents context and dimensions.</p><br>
    <shopping-cart class="shopping-cart"></shopping-cart>
  </main>
  <footer class="footer">
    <div class="footer__column footer__categories">
      <h2>Categories</h2>
      <ul>
        <li><a href="/">Keyboards</a></li>
        <li><a href="/">Mice</a></li>
        <li><a href="/">Screens</a></li>
        <li><a href="/">Laptops</a></li>
        <li><a href="/">Microphones</a></li>
        <li><a href="/">Headphones</a></li>
      </ul>
    </div>
    <div class="footer__column footer__support">
      <h2>Support</h2>
      <ul>
        <li><a href="/">Payments</a></li>
        <li><a href="/">Shipment</a></li>
        <li><a href="/">Returns</a></li>
      </ul>
    </div>
    <div class="footer__column footer__contact">
      <address>
        <h2>Peter's 'puters</h2>
        <span class="address__line">Wired street 42</span>
        <span class="address__line">ABC123 Bitville</span>
      </address>
    </div>
    <div class="footer__column footer__credits">Experiment by <a href="https://mrtnvh.com">mrtnvh</a></div>
  </footer>
</div>
              
            
!

CSS

              
                :root {
  --dark: #444;
  --gray: #ccc;
  --light: #eee;
  --spacer: 0.75rem;
  --primary: #7950f2;

  --link-color: var(--primary);
  --heading-color: var(--dark);

  --box-shadow: 0 5px 50px 0 rgba(0, 0, 0, 0.25);
}

@media screen and (min-width: 800px) {
  :root {
    --spacer: 1.5rem;
  }
}

body {
  font-family: sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: var(--dark);
  font-size: clamp(14px, 2vw, 16px);
  line-height: 1.5;
}

h1,
h2,
h3 {
  margin-block-start: 0;
  color: var(--heading-color);
  font-weight: 800;
  line-height: 1;
}

h1 {
  font-size: clamp(2.25rem, 6vw, 6rem);
  letter-spacing: -0.05em;
  margin-bottom: var(--spacer);
}

p {
  margin-bottom: var(--spacer);
}

a {
  color: var(--link-color);
}

input {
  font-size: 1rem;
}

.layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.header {
  --link-color: var(--light);
  background-color: var(--primary);
  color: var(--light);
  display: flex;
  align-items: center;
  justify-content: center;
  padding-inline: var(--spacer);
}

.header__brand {
  display: inline-flex;
  flex-grow: 1;
  font-weight: 800;
  letter-spacing: -0.025em;
  font-size: 1.5rem;
  padding: var(--spacer);
}

.header__cart {
  padding: var(--spacer);
}

.header__cart button {
  -webkit-appearance: none;
  padding: calc(var(--spacer) / 3) calc(var(--spacer) / 2);
  border: 1px solid var(--link-color);
  background: transparent;
  color: var(--light);
  font-weight: 800;
}

main {
  flex-grow: 1;
  padding: calc(var(--spacer) * 2) calc(var(--spacer) * 2);
}

.footer {
  --link-color: var(--light);
  --heading-color: var(--light);
  color: var(--light);
  background: linear-gradient(to bottom, #6741d9, #4d31a0);
  padding: calc(var(--spacer) * 2) var(--spacer);
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template:
    "categories support contact contact"
    "copy copy credits credits";
}

.footer__column {
  padding: calc(var(--spacer) / 2) calc(var(--spacer) / 1);
}

.footer__categories {
  grid-area: categories;
}

.footer__support {
  grid-area: support;
}

.footer__contact {
  grid-area: contact;
}

.footer__copy {
  grid-area: copy;
}

.footer__credits {
  grid-area: credits;
  text-align: right;
}

.footer ul {
  list-style: none;
  padding: 0;
}

.footer li {
  margin-block-end: calc(var(--spacer) / 3);
}

address {
  font-style: normal;
}

.address__line {
  display: block;
  margin-block-end: calc(var(--spacer) / 3);
}

.shopping-cart {
  display: block;
  padding-inline: var(--spacer);
  background: var(--light);
}

.warning {
  background-color: #fff9db;
  color: #e67700;
  padding: calc(var(--spacer) * 1.5) calc(var(--spacer) * 2);
}

@supports (container: inline-size) {
  .warning {
    display: none;
  }
}
              
            
!

JS

              
                import {
  html,
  css,
  LitElement
} from "https://cdn.skypack.dev/lit@2.0.0-rc.2?dts";
import {
  customElement,
  property,
  state
} from "https://cdn.skypack.dev/lit@2.0.0-rc.2/decorators.js";

interface Product {
  image: string;
  name: string;
  description?: string;
  price: number;
  quantity: number;
  id: number;
}

const products: Product[] = [
  {
    id: 98456,
    image:
      "https://images.unsplash.com/photo-1541807084-5c52b6b3adef?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=500&h=500&q=80",
    name: "Laptop",
    description:
      "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nam id varius nisl. Duis feugiat placerat est, a dignissim sapien dictum nec. Suspendisse eu ante eget nulla tempor tempor. Suspendisse ac nunc sollicitudin, eleifend nulla quis, pharetra enim. Pellentesque viverra tristique bibendum. Praesent vulputate at risus nec tempor. Praesent lorem neque, accumsan eget faucibus non, aliquam a purus. Aenean posuere massa vel lobortis tincidunt. Quisque bibendum varius laoreet. Nam dictum erat odio, a luctus lectus cursus a. Nam scelerisque turpis in nibh tempus, ac gravida justo lobortis. ",
    price: 2105.25,
    quantity: 3
  },
  {
    id: 65486,
    image:
      "https://images.unsplash.com/photo-1589578228447-e1a4e481c6c8?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=500&h=500&q=80",
    name: "Keyboard",
    description:
      "Duis feugiat placerat est, a dignissim sapien dictum nec. Suspendisse eu ante eget nulla tempor tempor. Suspendisse ac nunc sollicitudin, eleifend nulla quis, pharetra enim. Pellentesque viverra tristique bibendum. Praesent vulputate at risus nec tempor. Praesent lorem neque, accumsan eget faucibus non, aliquam a purus. Aenean posuere massa vel lobortis tincidunt. Quisque bibendum varius laoreet. Nam dictum erat odio",
    price: 140.73,
    quantity: 2
  },
  {
    id: 5546,
    image:
      "https://images.unsplash.com/photo-1569696863868-45f498a50ef1?ixid=MnwxMjA3fDB8MHxzZWFyY2h8MzN8fGhlYWRwaG9uZXN8ZW58MHx8MHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=500&h=500&q=60",
    name: "Headphones",
    description:
      "Praesent lorem neque, accumsan eget faucibus non, aliquam a purus. Aenean posuere massa vel lobortis tincidunt. Quisque bibendum varius laoreet. Nam dictum erat odio",
    price: 140.73,
    quantity: 2
  }
];

@customElement("shopping-cart")
export class ShoppingCart extends LitElement {
  static styles = css`
    :host {
      --shopping-cart-spacer: 0.75em;
    }
    
    .wrapper {
      container-type: inline-size;
    }

    input {
      font-size: 1rem;
    }

    table {
      width: 100%;
      border-collapse: collapse;
    }

    th {
      text-align: left;
    }

    th,
    td {
      border-bottom: 1px solid var(--gray);
      padding: calc(var(--shopping-cart-spacer) / 1);
    }

    td:first-child,
    th:first-child {
      padding-inline-start: 0;
    }

    td:last-child,
    th:last-child {
      padding-inline-end: 0;
    }

    tfoot tr:last-child td,
    tfoot tr:last-child th {
      border-bottom: 0;
    }

    .image-cell {
      display: none;
    }

    .image {
      max-width: 6em;
      max-height: 6em;
    }

    .content-cell {
      width: 100%;
    }

    .title {
      display: block;
    }

    .description {
      display: none;
      line-height: 1.5;
    }

    .unit-price-cell,
    .subtotal-cell {
      text-align: right;
    }

    .total-price-label {
      text-align: right;
    }

    .total-price-value {
      text-align: right;
      font-size: 1.25em;
      font-weight: 800;
    }

    @container (min-width: 500px) {
      :host {
        --shopping-cart-spacer: 1.5em;
      }

      .image-cell {
        display: table-cell;
      }

      .total-price-value {
        font-size: 1.5em;
      }
    }

    @container (min-width: 1050px) {
      .image {
        max-width: 12em;
        max-height: 12em;
      }

      .title {
        font-size: 1.5em;
        margin-bottom: 0.375em;
      }

      .description {
        display: block;
      }
    }
  `;

  @property()
  products: Product[] = products;

  @property()
  vat: number = 0.21;

  get totalPrice() {
    return this.products.reduce((acc, product) => {
      return acc + this.getProductSubTotal(product);
    }, 0);
  }

  getProductSubTotal(product: Product) {
    return product.quantity * product.price;
  }

  formatPrice(price: number) {
    return new Intl.NumberFormat("nl-BE", {
      style: "currency",
      currency: "EUR"
    }).format(price);
  }

  handleQuantityChange(event: InputEvent, productId: number) {
    const value = Number((event.composedPath()[0] as HTMLInputElement).value);
    const changedProductIndex = this.products.findIndex(
      ({ id }) => id === productId
    );

    if (changedProductIndex !== -1) {
      this.products[changedProductIndex] = {
        ...this.products[changedProductIndex],
        quantity: value
      };
    }

    this.requestUpdate();
  }

  render() {
    return html`
      <div class="wrapper">
        <table class="products">
          <thead>
            <tr>
              <th>Product</th>
              <th class="image-cell"></th>
              <th>Quantity</th>
              <th class="unit-price-cell">Price</th>
              <th class="subtotal-cell">Subtotal</th>
            </tr>
          </thead>
          <tbody>
            ${products.map(
              (product) => html`
                <tr>
                  <td class="image-cell">
                    <img
                      src="${product.image}"
                      alt="${product.name}"
                      class="image"
                    />
                  </td>
                  <td class="content-cell">
                    <strong class="title">${product.name}</strong>
                    <div class="description">${product.description}</div>
                  </td>
                  <td>
                    <input
                      class="product-quantity-input"
                      value="${product.quantity}"
                      type="number"
                      id="${product.name}_quantity"
                      name="${product.name}_quantity"
                      min="0"
                      max="100"
                      @input="${(e) => this.handleQuantityChange(e, product.id)}"
                    />
                  </td>
                  <td class="unit-price-cell">
                    ${this.formatPrice(product.price)}
                  </td>
                  <td class="subtotal-cell">
                    ${this.formatPrice(this.getProductSubTotal(product))}
                  </td>
                </tr>
              `
            )}
          </tbody>
          <tfoot>
            <tr>
              <th class="image-cell"></th>
              <th colspan="3" class="total-price-label">Total price</th>
              <td class="total-price-value">
                ${this.formatPrice(this.totalPrice)}
              </td>
            </tr>
          </tfoot>
        </table>
      </div>
    `;
  }
}

@customElement("shopping-cart-toggle")
export class ShoppingCartToggle extends LitElement {
  static styles = css`
    .dropdown {
      position: relative;
    }

    .dropdown-content {
      position: absolute;
      inset-block-start: calc(100% + 0.5rem);
      inset-inline-end: -0.5em;
      background-color: var(--light);
      color: var(--dark);
      padding: calc(var(--spacer) / 2) var(--spacer);
      box-shadow: var(--box-shadow);
      z-index: 1;
      inline-size: 29rem;
    }

    button {
      -webkit-appearance: none;
      padding: calc(var(--spacer) / 3) calc(var(--spacer) / 2);
      border: 1px solid var(--link-color);
      background: transparent;
      color: var(--light);
      font-weight: 800;
      font-size: 1rem;
      cursor: pointer;
    }

    button:hover,
    button:focus {
      background-color: var(--light);
      color: var(--primary);
    }
  `;

  @state()
  protected isOpen = false;

  handleDropdownToggle() {
    this.isOpen = !this.isOpen;
    this.requestUpdate();
  }

  render() {
    return html`
      <div class="dropdown">
        <button @click="${this.handleDropdownToggle}">
          <slot name="toggle" />
        </button>
        ${this.isOpen
          ? html`
              <div class="dropdown-content">
                <slot name="content"></slot>
              </div>
            `
          : ""}
      </div>
    `;
  }
}

              
            
!
999px

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