Lazy loading has been a term that was hot about 15 years ago and never stopped being in fashion. The images are mostly the heaviest part of a website and tend to slow everything down.
It was always pretty tedious to make a custom
It can be as simple as adding
loading="lazy" to an image element.
<img src="https://images.unsplash.com/photo-1591303872989-2640dc28185b?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=3236&q=80" loading="lazy" onload="alert('Cool right!');" />
We can define the
loading attribute and give it the value of
lazy, and the API comes with an
onload callback function.
Other values we can use are:
- auto - Default behavior, browser-specific
- lazy - Loads the image when it becomes visible based on scroll
- eager - Loads the image directly
See this in action on the following Codepen.
See the Pen Image Lazy Loading by Chris Bongers (@rebelchris) on CodePen.
Unfortunately, it's not fully supported by all browsers, but keep in mind if the browser doesn't support it, it will just show the image, so there is no harm in adding this!
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