3/17/2023 0 Comments Gatsby fluid image![]() Because file size is proportional to the square of the width, without sizes the user would download an image that's 9 times larger than necessary. Without the 33vw sizes, the image selected from the server would be 3 times as wide as it needs to be. This example sizes could have a dramatic effect on performance metrics. If the sizes property includes sizes such as 50vw, which represent a percentage of the viewport width, then the source set is trimmed to not include any values which are too small to ever be necessary.įor example, if you know your styling will cause an image to be full-width on mobile devices, in a 2-column layout on tablets, and a 3-column layout on desktop displays, you should include a sizes property such as the following: import Image from 'next/image' const Example = ( ) => ( ) If sizes is defined, a large source set is generated, suitable for a responsive image. If no sizes value is present, a small source set is generated, suitable for a fixed-size image. Second, the sizes property configures how next/image automatically generates an image source set. If you don't specify a sizes value in an image with the fill property, a default value of 100vw (full screen width) is used. The sizes property allows you to tell the browser that the image will actually be smaller than full screen. When the browser chooses, it does not yet know the size of the image on the page, so it selects an image that is the same size or larger than the viewport. The sizes property serves two important purposes related to image performance:įirst, the value of sizes is used by the browser to determine which size of the image to download, from next/image's automatically-generated source set. The value of sizes will greatly affect performance for images using fill or which are styled to have a responsive size. For this to look correct, the overflow: "hidden" style should be assigned to the parent element.Ī string that provides information about how wide the image will be at different breakpoints. You may prefer to set object-fit: "contain" for an image which is letterboxed to fit the container and preserve aspect ratio.Īlternatively, object-fit: "cover" will cause the image to fill the entire container and be cropped to preserve aspect ratio. The default image fit behavior will stretch the image to fit the container. ![]() The parent element must assign position: "relative", position: "fixed", or position: "absolute" style.īy default, the img element will automatically be assigned the position: "absolute" style. fillĪ boolean that causes the image to fill the parent element instead of setting width and height.
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