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HTML

            
              <one-dialog >
  <span slot="heading">Hello world</span>
  <div>
    <p>Lorem ipsum dolor amet tilde bicycle rights affogato brooklyn. Whatever lomo subway tile sriracha gastropub edison bulb shabby chic tumeric meditation mustache raw denim.</p>
    
    <p>reegan ugh bespoke you probably haven't heard of them godard crucifix pabst. Selvage biodiesel vice copper mug lumbersexual cred plaid. Skateboard pitchfork listicle fashion axe. Chillwave viral butcher vegan wolf.</p>
  </div>
</one-dialog>

<button id="launch-dialog">Launch dialog</button>
            
          
!

CSS

            
              #launch-dialog {
  background: tomato;
  border-radius: 4px;
  color: #fff;
  font-family: Helvetica, Arial, sans-serif;
  padding: 0.5rem 1rem;
  position: static;
}
            
          
!

JS

            
              import { LitElement, html, css } from 'https://unpkg.com/@polymer/lit-element@latest/lit-element.js?module';

const privateOpen = Symbol('open');

class OneDialog extends LitElement {
  static get properties() {
    return { 
      open: { type: Boolean, attribute: 'open', reflect: true }
    };
  }
  
  static get styles() {
    return [css`.wrapper {
        opacity: 0;
        transition: visibility 0s, opacity 0.25s ease-in;
      }
      .wrapper:not(.open) {
        visibility: hidden;
      }
      .wrapper.open {
        align-items: center;
        display: flex;
        justify-content: center;
        height: 100vh;
        position: fixed;
          top: 0;
          left: 0;
          right: 0;
          bottom: 0;
        opacity: 1;
        visibility: visible;
      }
      .overlay {
        background: rgba(0, 0, 0, 0.8);
        height: 100%;
        position: fixed;
          top: 0;
          right: 0;
          bottom: 0;
          left: 0;
        width: 100%;
      }
      .dialog {
        background: #ffffff;
        max-width: 600px;
        padding: 1rem;
        position: fixed;
      }
      button {
        all: unset;
        cursor: pointer;
        font-size: 1.25rem;
        position: absolute;
          top: 1rem;
          right: 1rem;
      }
      button:focus {
        border: 2px solid blue;
      }`];
  }
  
  firstUpdated() {
    this._watchEscape = this._watchEscape.bind(this);
  }
  
  render() {
    return html`
    <div class="wrapper ${this.open ? 'open' : ''}" aria-hidden="${!this.open}">
    <div class="overlay" @click="${this.close}"></div>
      <div class="dialog" role="dialog" aria-labelledby="title" aria-describedby="content">
        <button class="close" aria-label="Close" @click=${this.close}>✖️</button>
        <h1 id="title"><slot name="heading"></slot></h1>
        <div id="content" class="content">
          <slot></slot>
        </div>
      </div>
    </div>`;
  }
  
  get open() { return this[privateOpen]; }
  set open(isOpen) {
    this[privateOpen] = isOpen;
    const { shadowRoot } = this;
    const { activeElement } = document;
    if (isOpen) {
      setTimeout(() => 
        shadowRoot.querySelector('button').focus());
      if (activeElement) {
        this._wasFocused = activeElement;
      }
      document.addEventListener('keydown', this._watchEscape);
    } else {
      this._wasFocused && this._wasFocused.focus && this._wasFocused.focus();
      document.removeEventListener('keydown', this._watchEscape);
    }
  }
  
  close() {
    this.open = false
    const closeEvent = new CustomEvent('dialog-closed');
    this.dispatchEvent(closeEvent);
  }
  
  _watchEscape(event) {
    if (event.key === 'Escape') {
        this.close();   
    }
  }
}

customElements.define('one-dialog', OneDialog);

const button = document.getElementById('launch-dialog');
button.addEventListener('click', () => {
  document.querySelector('one-dialog').open = true;
});
            
          
!
999px

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