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HTML

              
                <template id="new-template">
  <style>
    .wrapper {
      font-family: -system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";
      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: linear-gradient(to left, #ff8a00, #da1b60);
      height: 100%;
      opacity: 0.9;
      position: fixed;
        top: 0;
        right: 0;
        bottom: 0;
        left: 0;
      width: 100%;
    }
    .dialog {
      background: #ffffff;
      border-radius: 1rem;
      max-width: 600px;
      padding: 1rem;
      position: fixed;
    }
    h1 {
      margin-top: 0;
    }
    button {
      all: unset;
      cursor: pointer;
      font-size: 1.25rem;
      position: absolute;
      top: 1rem;
      right: 1rem;
    }
    button:focus {
      border: 2px solid blue;
    }
  </style>
  <div class="wrapper">
    <div class="overlay"></div>
    <div class="dialog" role="dialog" aria-labelledby="title" aria-describedby="content">
      <button class="close" aria-label="Close">✖️</button>
      <h1 id="title"><slot name="heading"></slot></h1>
      <div id="content" class="content">
        <slot></slot>
      </div>
    </div>
  </div>
</template>

<one-dialog template="new-template">
  <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

              
                'use strict';

class OneDialog extends HTMLElement {
  static get observedAttributes() {
    return ['open', 'template'];
  }
  
  constructor() {
    super();
    this.attachShadow({ mode: 'open' });
    this.close = this.close.bind(this);
  }
  
  attributeChangedCallback(attrName, oldValue, newValue) {
    if (newValue !== oldValue) {
      switch (attrName) {
        /** Boolean attributes */
        case 'open':
          this[attrName] = this.hasAttribute(attrName);
          break;
        /** Value attributes */
        case 'template':
          this[attrName] = newValue;
          break;
      }
    }
  }
  
  connectedCallback() {
    this.render();
  }
  
  disconnectedCallback() {
    this.shadowRoot.querySelector('button').removeEventListener('click', this.close);
    this.shadowRoot.querySelector('.overlay').removeEventListener('click', this.close);
  }
  
  render() {
    const { shadowRoot, template } = this;
    const templateNode = document.getElementById(template);
    if (templateNode) {
      const content = document.importNode(templateNode.content, true);
      shadowRoot.appendChild(content);
    } else {
      shadowRoot.innerHTML = `<style>
        .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;
        }
      </style>
      <div class="wrapper">
      <div class="overlay"></div>
        <div class="dialog" role="dialog" aria-labelledby="title" aria-describedby="content">
          <button class="close" aria-label="Close">✖️</button>
          <h1 id="title"><slot name="heading"></slot></h1>
          <div id="content" class="content">
            <slot></slot>
          </div>
        </div>
      </div>`;
    }    
    
    shadowRoot.querySelector('button').addEventListener('click', this.close);
    shadowRoot.querySelector('.overlay').addEventListener('click', this.close);
    this.open = this.open;
  }
  
  get open() {
    return this.hasAttribute('open');
  }
  
  get template() {
    return this.getAttribute('template');
  }
  
  
  set template(template) {
    if (template) {
      this.setAttribute('template', template);
    } else {
      this.removeAttribute('template');
    }
    this.render();
  } 
  
  set open(isOpen) {
    const { shadowRoot } = this;
    shadowRoot.querySelector('.wrapper').classList.toggle('open', isOpen);
    shadowRoot.querySelector('.wrapper').setAttribute('aria-hidden', !isOpen);
    if (isOpen) {
      this._wasFocused = document.activeElement;
      this.setAttribute('open', '');
      document.addEventListener('keydown', this._watchEscape);
      this.focus();
      shadowRoot.querySelector('button').focus();
    } else {
      this._wasFocused && this._wasFocused.focus && this._wasFocused.focus();
      this.removeAttribute('open');
      document.removeEventListener('keydown', this._watchEscape);
      this.close();
    }
  }
  
  
  close() {
    if (this.open !== false) {
      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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