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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