Which HTML data attribute does Lazysizes use to define an array of pixel sizes for responsive images?

Lazysizes utilizes the "data-sizes" HTML data attribute to define an array of pixel sizes for responsive images. This attribute allows developers to specify different sizes of the image that can be served based on the viewport size of the device.

By using "data-sizes," Lazysizes can make intelligent decisions about which image size to load based on the current viewport, which is essential for optimizing loading speed and maintaining visual quality. When this attribute is set, it indicates to Lazysizes how to adaptively load images and ensures that the most appropriate resolution is selected for the user's screen, giving a better experience and saving bandwidth.

The other options don’t align with Lazysizes’ conventions or functionality. "data-widths" is not used by Lazysizes for responsive image sizes; neither are "image-sizes" or "image-widths." Understanding the specific attribute used helps developers effectively implement lazy loading for responsive images, ensuring that they provide the best performance across different devices.