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HTML

            
              <button>Hover for a new image</button>
!

CSS

            
              html, body {
  min-height: 400px;
}

button {
  background: #ddd;
  border: none;
  font-size: 20px;
  padding: 10px 20px;
}

.tippy-tooltip.ajax-theme {
  position: absolute;
  width: 200px;
  padding: 0;
  overflow: hidden;
}

.tippy-tooltip.ajax-theme img {
  display: block;
  max-width: 100%;
}

/* 
We need to "pin" the tooltip absolutely to the bottom or top of the popper element depending on the placement. Note: this overrides the `distance` option. You can change `0` to be whatever you want. 
*/
.tippy-tooltip.ajax-theme[x-placement^='top'] {
  top: auto !important;
  bottom: 0;
}

.tippy-tooltip.ajax-theme[x-placement^='bottom'] {
  bottom: auto !important;
  top: 0;
}
!

JS

            
              const INITIAL_CONTENT = '<div style="margin:5px 0;">Loading...</div>'

tippy('button', {
  content: INITIAL_CONTENT,
  animation: 'fade',
  animateFill: false,
  theme: 'ajax',
  onShow(tip) {
    if (tip.state.isFetching === true || tip.state.canFetch === false) {
      return
    }

    tip.state.isFetching = true
    tip.state.canFetch = false

    const { popper } = tip
    const { tooltip, content } = tip.popperChildren

    // Because the tooltip has `position: absolute`,
    // it no longer affects the parent popper's layout.
    // We need to explicitly give it a width.
    popper.style.width = '200px'
    
    // Setup transition styles
    tooltip.style.transitionDuration = '0.2s'
    tooltip.style.transitionProperty = 'visibility, opacity, height'

    fetch('https://unsplash.it/200/?random')
      .then(response => response.blob())
      .then(blob => {
        tip.state.isFetching = false

        const url = URL.createObjectURL(blob)

        if (!tip.state.isVisible) {
          return
        }

        const img = new Image()
        img.width = 200
        img.height = 200
        img.src = url

        // Wait until the height transition has finished before
        // fading the content in. Since we have `overflow: hidden`
        // on the tooltip this isn't actually needed, but if you
        // have an arrow element it will be.
        if (!tip._transitionEndListener) {
          tip._transitionEndListener = event => {
            if (event.target === event.currentTarget) {
              content.style.opacity = '1'
              tip.setContent(img)
            }
          }
        }
        tooltip.addEventListener('transitionend', tip._transitionEndListener)

        // Store the base height of the tooltip when it has the
        // initial Loading... content.
        if (!tip._baseHeight) {
          tip._baseHeight = tooltip.clientHeight
        }

        // Here is where we find out the height of the tooltip
        // when it has the content. We could technically hardcode
        // 200px as the value, but it's useful to know how to do
        // this with dynamic content.
        content.style.opacity = '0'
        // Temporarily set the image as the tooltip's content
        // so we can find out the final height of the tooltip.
        tip.setContent(img)
        const height = tooltip.clientHeight
        // Apply the height to the parent popper element.
        popper.style.height = height + 'px'
        // Reset the tooltip's height to the base height.
        tooltip.style.height = tip._baseHeight + 'px'
        // Cause reflow so we can start the height transition.
        void tooltip.offsetHeight
        // Start the transition.
        tooltip.style.height = height + 'px'
        // Remove the Loading... content and wait until the
        // transition finishes.
        tip.setContent('')
      })
      .catch(() => {
        tip.state.isFetching = false
      })
  },
  onHidden(tip) {
    tip.state.canFetch = true
    tip.setContent(INITIAL_CONTENT)
    const { tooltip } = tip.popperChildren
    tooltip.style.height = null
    tooltip.removeEventListener('transitionend', tip._transitionEndListener)
    tip._transitionEndListener = null
  }
})
!
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