![]() You can use Thumbor or a free image CDN like ImageKit.io to resize images dynamically using URL parameters. To overcome this, you should serve already resized images from the server. There are a couple of downsides of client-side image resizing, mainly poor image quality and slower image rendering. The exact algorithm used by the browser for scaling can vary and depends on the underlying hardware and OS. If the image element's required height and width don’t match the image's actual dimensions, then the browser downscales (or upscale) the image. We can render it with a height of 500 pixels and a width of 400 pixels CSS pixels.įor example, the original image is 640×960. These values specify the height and width of the image element. One of the simplest ways to resize an image in the HTML is using the height and width attributes on the img tag. The background-size of first div element set to auto, second div element is set to 150px 150px, and the background-size of third div element is set to 30%.If your image doesn’t fit the layout, you can resize it in the HTML. Here we are using the length and percentage values to set the background-size of div element. Every div element has a background-image on which we are applying the background-size property. In this example, there are three div elements with a width of 300px and a height of 200px. ![]() Let's understand this CSS property by using some illustrations. Inherit: It inherits the property from its parent element. Initial: It sets the property to its default value. It resizes the image to ensure the element is completely covered.Ĭontain: Without stretching or cropping, it resizes the background image to ensure the image is completely visible. Sometimes, it crops the little bit off one of the edges or stretches the image. Negative values are not allowed.Ĭover: This value is used to resize the background image to cover the entire container. Percentage: This value defines the width and height of the background image to the percentage (%) of the background positioning area. If two values are given, the first value sets the width, and the second value sets the height. Its single value specifies the width of the image, and the height sets to auto. This value stretches the image in the corresponding dimension of the given length. Length: It is used to set the width and height of the background image. Property ValuesĪuto: This is the default value, which displays the background image in its original size. The values of this property are defined as follows. Syntaxīackground-size: auto | length | cover | contain | initial | inherit In contrast, the contain value of this property scales the image as much as possible without clipping the image. The cover value of the background-size property is used to cover the entire background area of the element. If an element has multiple background images, we can define the comma-separated values to define the different sizes of each one. Its single-value syntax defines the width of the image (in this case, the height sets to auto), whereas the double values define the value of both height and width in which the first value sets the width and second sets the height. It has two possible keyword values that are contain and cover. This property can be defined using length, percentage, or keyword values. It allows us to control the scaling of the background image. The background image can be stretched or constrained to fit into the existing space. The background-size CSS property is used to set the size of a background image of an element. Next → ← prev CSS background-size property
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