new: img lazy loading in html

img lazy loading in html.md

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+# img lazy loading in html
+
+To implement [[Lazy Loading]] to an `<img ... >` tag, add the attrbitue `loading=lazy`
+
+    <img loading=lazy ... >
+
+This will load the image when scrolling is near the viewport, using the [Intersection Observer API](https://developers.google.com/web/updates/2016/04/intersectionobserver)
+
+## Further reading
+
+- <https://web.dev/native-lazy-loading>
+
+## Why learned this
+
+- Accidentally: a rabbit hole that started at [Jason Crawford's github](https://github.com/jasoncrawford) and ended at <https://github.com/owid/owid-grapher/pull/422>