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Is there a way for me to input css arguments in css height property that are relative to the screen resolution?

Asked By: Anonymous

So I am creating a website and whenever I need to input an image I need to rely on pre-resizing the image, using CSS results in the destruction of the original aspect ratio of the image… So I resize them to fit my screen and later realize that other people have different screen resolutions so my 20 pixels are not their 20 pixels, this leads me to ask whether there is a way to insert images using CSS and resizing it (or any HTML elements in general) relative to the user’s resolution…I can resize the pics if a have to…
I am 3 days old to web dev in general… So pls tell me if and where u see a mistake and how to correct it.


Solution

Answered By: Anonymous

You don’t have to resize the picture. You can put a reasonable sized image (big enough to be clear, small enough to not take too much space or load slow).

You can use the vh and vw units to reference a percentage of the viewport’s height or width.

So, if you have an image you want to resize, add that styling to make it stretch on the entire screen:

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document.querySelector('button').onclick = makefullscreen;

function makefullscreen() {
  document.querySelector('img').classList.toggle('fullscreen');
}

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img.fullscreen {
  position: absolute;
  height: 100vh; /* <-- make the image 100% of the viewport height */
  width: auto; /* <-- match the width based on image aspect ratio */
  /* positioning */
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  margin: auto;
}

body {
  background: #212121;
  display: flex;
  justify-content: center;
}

button {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  margin: 1em auto;
}

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<img src="https://picsum.photos/id/237/200/300">
<button click="makefullscreen()">toggle image fullscreen</button>

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Other than this, you can add the same image in multiple sizes to also load the biggest image that matches the resolution. Notice that this mostly is used to optimize serving the images and not their actual size on the HTML page.

The trick here is to start with the biggest possible image, or — at least — the biggest image you plan to serve up. Then scale it down to each individual version.

  • Largest or original — image-4x.jpg
  • Scaled down to 75% — image-3x.jpg
  • Scaled down to 50% — image-2x.jpg
  • Scaled down to 25% — image-1x.jpg

In order to do this, you need to use srcset:

<img
 srcset="
  url size,
  url size,
  url size
 "
 src="default url"
>
<img
 srcset="
  /wp-content/uploads/flamingo4x.jpg 4x,
  /wp-content/uploads/flamingo3x.jpg 3x,
  /wp-content/uploads/flamingo2x.jpg 2x,
  /wp-content/uploads/flamingo1x.jpg 1x
 "
 src="/wp-content/uploads/flamingo-fallback.jpg"
>

read more about it here

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