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How to prevent content reflow from lazy-loaded images?
Times changed fast here, and to avoid lazy-load jank, all you have to do is put the correct natural width and height attributes on images and they will load nicely, even if CSS makes the image fluid with. So do it like:
When to use lazy loading in a website?
The technique of lazy loading can be applied to almost all the resources on a page. For example, in a single page application, if a JS file is not needed until later, it is best not to load it initially. If an image is not needed up front, load it later when it actually needs to be viewed. Why go for lazy loading images at all?
How to override the lazy loading image property in CSS?
However, when we add the lazy class to the element, we can override the background-image property by setting the value of it to none in the CSS. Since an element with an ID and a class has higher specificity in CSS than an ID alone, the browser applies the property background-image: none to the element initially.
What is the charge for lazy loading images?
Image delivery, or delivery of any other asset, is usually charged on the basis of the number of bytes transferred. As mentioned earlier, with lazy loading, if the image is not visible, it never gets loaded.
How does the browser trigger the loading of an image?
For images loaded using the tag, the browser uses the src attribute of the tag to trigger the image load. Irrespective of whether it is the 1st or the 1000th image in your HTML and well off-screen, if the browser gets the src attribute, it would trigger the image load.
What happens when images are never loaded on a website?
The result is the browser loading fewer images up front so that the page loads faster. Additionally, if the user never scrolls far enough to see an image, that image is never loaded. That equals faster page loads and less data the user needs to spend.
How to check when an image enters the viewport?
To check when an image enters the viewport, there are two ways: Trigger image load using Javascript events In this technique, we use event listeners on the scroll, resize, and orientationChange events in the browser. The scroll event is an obvious one to check when the user scrolls the page.