{
  "title":"Lazy loading via attribute for images & iframes",
  "description":"The `loading` attribute on images & iframes gives authors control over when the browser should start loading the resource. ",
  "spec":"https://html.spec.whatwg.org/multipage/urls-and-fetching.html#lazy-loading-attributes",
  "status":"ls",
  "links":[
    {
      "url":"https://addyosmani.com/blog/lazy-loading/",
      "title":"Blog post"
    },
    {
      "url":"https://github.com/scott-little/lazyload",
      "title":"Explainer"
    },
    {
      "url":"https://webkit.org/b/196698",
      "title":"WebKit support bug"
    },
    {
      "url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1622090",
      "title":"Firefox support bug for lazy loading iframes"
    },
    {
      "url":"https://github.com/mfranzke/loading-attribute-polyfill",
      "title":"Polyfill"
    }
  ],
  "bugs":[
    {
      "description":"Safari 16.1 and below displays a gray border while lazy loading images ([243601](https://bugs.webkit.org/show_bug.cgi?id=243601))"
    },
    {
      "description":"Safari does not load lazy loaded elements before printing ([224547](https://bugs.webkit.org/show_bug.cgi?id=224547)). Chromium fixed a similar bug in January 2022 ([875403](https://bugs.chromium.org/p/chromium/issues/detail?id=875403))."
    },
    {
      "description":"Chromium-based browsers have a memory leak when lazy loading images ([1213045](https://bugs.chromium.org/p/chromium/issues/detail?id=1213045)). This issue was fixed in late 2023 for release M116."
    },
    {
      "description":"Firefox requires the loading attribute to be set BEFORE the src element for Javascript created images ([1647077](https://bugzilla.mozilla.org/show_bug.cgi?id=1647077))"
    }
  ],
  "categories":[
    "HTML5"
  ],
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  "notes":"",
  "notes_by_num":{
    "1":"Firefox only supports lazy loading for images",
    "2":"Can be enabled in Settings under the Safari > Advanced > Experimental Features menu.",
    "3":"Safari supports lazy image loading. Lazy iframes loading can be enabled under the Experimental Features menu."
  },
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  "parent":"",
  "keywords":"lazy-loading,lazyloading,loading=\"lazy\",loading=\"eager\",loading=\"auto\",loading,attribute,lazily,lazy image loading,lazy img loading,iframe loading,native lazyload",
  "chrome_id":"5645767347798016",
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}