Confluence Datacenter user-macro to embed an iFrame including some extra features

macro.html

## @param Height:title=Height|type=int|required=false|default=500|desc=Height of the embed
## @param Src:title=Source|type=string|required=true|desc=URL to embed
## @param AutoResize:title=Auto-Resize|type=boolean|required=false|default=false|desc=Enable Script to Auto-Resize frame

<iframe
  id="confluenceFrame"
  frameborder="0"
  height="$paramHeight"
  referrerpolicy="same-origin"
  src="$paramSrc"
  width="100%"
></iframe>

<script>
  const frame = document.getElementById('confluenceFrame')
  const html = document.getElementsByTagName('html')[0]

  frame.addEventListener('load', () => {
    frame.contentWindow
      .postMessage({
        confluenceColorMode: html.dataset.colorMode,
      }, '$paramSrc')
  })

#if ($paramAutoResize)
  window.addEventListener('message', event => {
    if (event.data.confluenceFrameHeight) {
      frame.style.setProperty('height', `${event.data.confluenceFrameHeight}px`)
    }
  })
#end
</script>