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I've read all over the Internet that I should not define fonts (or anything) with absolute pixel height/width/size and instead, use EM ... so that on higher resolution displays, my web site can scale appropriately.
However, what do I use to define IMAGE height/width ... because images won't scale well (they look pixelated)
UPDATE:
To clarify, I'm not referring to page zoom. I'm referring to how to make my web application resolution independent so that it will look correct on higher DPI displays.
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Use object fit property in your css, and give a fixed width and height to your image tag or respective class so that every image will have same width and height, Now Your Image won't be distorted.
One of the simplest ways to resize an image in the HTML is using the height and width attributes on the img tag. These values specify the height and width of the image element.
We can resize the image by specifying the width and height of an image. A common solution is to use the max-width: 100%; and height: auto; so that large images do not exceed the width of their container. The max-width and max-height properties of CSS works better, but they are not supported in many browsers.
I know this question is a bit old, but want to put this out there for anybody who may come along later. When talking about mobile devices which have higher pixel densities, the mobile browsers will zoom the page in by an amount to make it appear as though the web page is not very small. Devices implement this zooming as per the CSS 2.1 specification.
For example, many devices today have a 1.5x pixel density ratio compared to desktop monitors. As a result, the mobile browser will zoom websites by about 150% to compensate for the extra pixels. The new retina display has a 2x pixel density ratio... and as such the browser zooms in websites by about 200%.
Point of the matter - developers should not have to worry about different resolution devices. If you wish for your images to show up clearly on high resolution devices, you will need a higher resolution image. You generally don't have to worry about 1.5x devices as the quality difference is negligible and not worth the effort. However, the new retina display causes some really blurry images, and as a result you should use 2x the image.
So for the following image, you would want to export a 600x400px image in order for the image to show up clearly on the new retina display:
<img src="photo.jpg" style="width:300px; height:200px" />
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