[data-src],
[data-bg-src] {
  transition: opacity 1.4s;
  opacity: 0;
}
[data-src=""],
[data-bg-src=""] {
  opacity: 1;
}
/* HACK: Some browsers do not fire IntersectionObserver events for elements with a height and/or width of 0. */
img[data-src] {
  min-height: 1px;
  min-width: 1px;
}

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