Define an <Img>'s Src Attribute in CSS

Define an img 's src attribute in CSS

#divID {
    background-image: url("http://imageurlhere.com");
    background-repeat: no-repeat;
    width: auto; /*or your image's width*/
    height: auto; /*or your image's height*/
    margin: 0;
    padding: 0;
}

Is it possible to set the equivalent of a src attribute of an img tag in CSS?

Use content:url("image.jpg").

Full working solution (Live Demo):

<!doctype html>

<style>
.MyClass123{
    content:url("http://imgur.com/SZ8Cm.jpg");
}
</style>

<img class="MyClass123"/>

What's the valid way to include an image with no src?

While there is no valid way to omit an image's source, there are sources which won't cause server hits. I recently had a similar issue with iframes and determined //:0 to be the best option. No, really!

Starting with // (omitting the protocol) causes the protocol of the current page to be used, preventing "insecure content" warnings in HTTPS pages. Skipping the host name isn't necessary, but makes it shorter. Finally, a port of :0 ensures that a server request can't be made (it isn't a valid port, according to the spec).

This is the only URL which I found caused no server hits or error messages in any browser. The usual choice — javascript:void(0) — will cause an "insecure content" warning in IE7 if used on a page served via HTTPS. Any other port caused an attempted server connection, even for invalid addresses. (Some browsers would simply make the invalid request and wait for them to time out.)

This was tested in Chrome, Safari 5, FF 3.6, and IE 6/7/8, but I would expect it to work in any browser, as it should be the network layer which kills any attempted request.

How to set src attribute of [input=image] by external css

Since CSS is not a must, then javascript is here to do the job.

example , setting your dataUri inside an array and and a loop on your inputs to update the src attribute:

// set an array with each of your dataUris
const img =new Array ('data:image/svg+xml;base64,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' ,
' data:image/svg+xml;base64,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',

'data:image/svg+xml;base64,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');

// reset src attributes from dataUri stored in img()
let myIpts =document.querySelectorAll('input[id^="imgBtn"]');
for (i = 0; i < myIpts.length; i++) {
  myIpts[i].setAttribute('src', img[i] );
}

<html>
<style>

</style>

<body>
  <input id="imgBtn1" type="image" src="data:image/svg+xml;base64,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"
    alt="Opss">
  <label for="imgBtn1">btn1 - att src</label>
  <br>
  <input id="imgBtn2" type="image" class="img2" alt="Opss">
  <label for=" imgBtn2 ">btn2 - by css class</label>
  <br>
  <input id="imgBtn3" type="image" class="img3" alt="Opss">
  <label for="imgBtn3 ">btn3 - by css class</label>
</body>

</html>

Javascript : get img src and set as variable?

As long as the script is after the img, then:

var youtubeimgsrc = document.getElementById("youtubeimg").src;

See getElementById in the DOM specification.

If the script is before the img, then of course the img doesn't exist yet, and that doesn't work. This is one reason why many people recommend putting scripts at the end of the body element.

Side note: It doesn't matter in your case because you've used an absolute URL, but if you used a relative URL in the attribute, like this:

<img id="foo" src="/images/example.png">

...the src reflected property will be the resolved URL — that is, the absolute URL that that turns into. So if that were on the page http://www.example.com, document.getElementById("foo").src would give you "http://www.example.com/images/example.png".

If you wanted the src attribute's content as is, without being resolved, you'd use getAttribute instead: document.getElementById("foo").getAttribute("src"). That would give you "/images/example.png" with my example above.

If you have an absolute URL, like the one in your question, it doesn't matter.

How does one use the onerror attribute of an img element

This works:

<img src="invalid_link"
     onerror="this.onerror=null;this.src='https://placeimg.com/200/300/animals';"
>

Live demo: http://jsfiddle.net/oLqfxjoz/

As Nikola pointed out in the comment below, in case the backup URL is invalid as well, some browsers will trigger the "error" event again which will result in an infinite loop. We can guard against this by simply nullifying the "error" handler via this.onerror=null;.

Replace src of Image tag using css property

You can use content:url("image.jpg")

https://developer.mozilla.org/en-US/docs/Web/CSS/content

In your CSS,

.img {
    content:url("/new/image/source.png");
}

If you cannot modify HTML,

img {
    content:url("/new/image/source.png");
}

In HTML,

<img class="img"/>

I have not try this yet, but I not sure if the inline attribute src will overweight the CSS content.

Update

It should work if you already have src for your img element. Thanks @pol

img src tag not displaying image

Fixed problem, I redirected the path to my assets folder which is where the images folder is,

<img src="assets/twitter.png">

And it worked. Don't really know why though!

Define an <Img>'s Src Attribute in CSS