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html template tag

const tagName = `emoji-element`;

const template = document.createElement('template');
template.innerHTML = `
  <style>
    :host {
      display: block;
      position: relative;
    }
    #image,
    #placeholder ::slotted(*) {
      position: absolute;
      top: 0;
      left: 0;
      transition:
        opacity
        var(--emoji-element-fade-duration, 0.3s)
        var(--emoji-element-fade-easing, ease);
      object-fit: var(--emoji-element-fit, contain);
       var(--emoji-element-width, 100%);
      height: var(--emoji-element-height, 100%);
    }
    :host([fade]) #placeholder:not([aria-hidden="true"]) ::slotted(*),
    :host([fade]) #image:not([aria-hidden="true"]) {
      opacity: 1;
    }
    :host([fade]) #image,
    :host([fade]) #placeholder[aria-hidden="true"] ::slotted(*) {
      opacity: 0;
    }
  </style>
  <div id="placeholder" aria-hidden="false">
    <slot name="placeholder"></slot>
  </div>
  <img id="image" aria-hidden="true"/>
`;

html template

https://caniuse.com/#search=html templates

https://caniuse.com/#search=customElements

web components

https://caniuse.com/#search=web components

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