Fix Slow Loads, Layout Shifts & Render Blocking [2025]

定义和用法. loading 属性指定浏览器是应立即加载图像还是延迟加载图像。 设置loading=lazy 只有鼠标滚动到该图片所在位置才会显示。

The loading attribute specifies whether a browser should load an image immediately or to defer loading of off-screen images until for example the user scrolls ...

The HTMLImageElement property loading is a string whose value provides a hint to the user agent on how to handle the loading of the image ... Value · Usage notes · Examples

Lazy loading 是廣為人知的網頁優化技巧，尤其應用在圖片上時能夠大幅減少效能和流量的浪費，目前也有許多圖片Lazy loading 的套件可以使用，甚至已經有瀏覽器內建 ...

上圖是沒有用preload，會按照各資源在HTML 中的順序載入，所以先載 *.css 才載 .jpg; 下圖是有用preload，會先把要preload 的資源（ *.jpg ）載入後，才開始下載 ...

You can use the loading attribute to lazy-load images without the need to write custom lazy-loading code or use a separate JavaScript library.

Eager loading refers to a loading behavior exhibited by the browser whereby the loading of a resource is initiated as soon as it is encountered in the HTML. As ...

This attribute handles how an image will be loaded on a webpage. It accepts three string values, namely, auto, eager and lazy.

Before this, we should including a javascript or jQuery plugin while we need ＜img /＞ element to implement lazy loading. It's a old-school way.

The HTML <img> tag is used to embed an image in a web page. Images are not technically inserted into a web page; images are linked to web pages. Image Map · A floating image · Image as a Link · Try it Yourself