Tiggles ツ of Speak Creative
9/16/2019 - 2:45 PM

Lazy Load Images

Chrome 76 now supports loading="lazy|auto|eager" attribute. Here's a fallback script for older browsers. (looking at you, IE)

https://web.dev/native-lazy-loading

html.html
content_copyfile_download
<!-- Let's load this in-viewport image normally -->
<img src="hero.jpg" alt="…">

<!-- Let's lazy-load the rest of these images -->
<img data-src="unicorn.jpg" alt="…" loading="lazy" class="lazyload">
<img data-src="cats.jpg" alt="…" loading="lazy" class="lazyload">
<img data-src="dogs.jpg" alt="…" loading="lazy" class="lazyload">

<script>
  if ('loading' in HTMLImageElement.prototype) {
    const images = document.querySelectorAll('img[loading="lazy"]');
    images.forEach(img => {
      img.src = img.dataset.src;
    });
  } else {
    // Dynamically import the LazySizes library
    const script = document.createElement('script');
    script.src =
      'https://cdnjs.cloudflare.com/ajax/libs/lazysizes/4.1.8/lazysizes.min.js';
    document.body.appendChild(script);
  }
</script>