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tags: html css img image height width why HowTo ;;;
Search = "annoying, glitchy page jump when the other elements on the page move to accommodate each image as it loads"
Why indicate the height?
Typically, with modern web design layout, you do not specify the height of an image or other element. The rendered, display height is a result of the width. (Hence the prevalent use of height: auto; in CSS layouts). For example, given an image with an intrinsic size of 200 px by 100 px (2:1 aspect ratio), if the rendered width is 150px, the rendered height will be 75%. Why does this matter? The browser doesn't know what the intrinsic size of an image is until it has downloaded and inspected it. So, until that happens, it doesn't know how much space to allot to it on page. Depending on the way the layout is structured, it can often (not always) figure out the width, but it won't be able to figure out the rendered height without information on the image's actual proportions. This causes an annoying, glitchy page jump when the other elements on the page move to accommodate each image as it loads. On a page with a lot of images, this can be a real problem. The simple solution is to include information about an image's height and width in the markup. You still need to specify the display size in the CSS, but providing information about the file will help browsers render the page faster and more accurately.

.img-full { max-width: 100%; height: auto; }
<img src="/wp-content/uploads/very-large-flamingo.jpg" width="1280" height="850">

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html  css  img  image  height  width  why  HowTo 
october 2018 by neerajsinghvns
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tags: HTML w3schools line-height line height width thick thickness space spacing ;;;
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tags: CSS Height and Width Dimensions | wide needsEditing add @media with screenWidth to this ;;;
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