Image re-size to 50% of original size in HTML

I'm trying to re-size a image in HTML, it's got width 314px and height 212px. I want to re-size it to 50%...

but using this I still get a bigger image instead of a half-size image.

<img src="image.jpg" width="50%" height="50%" />

What did I do wrong? Thanks

<html>
    <head>
    <title></title>
    </head>    
    <body>
        <div>
        <img src="image4.png" width="50%" height="50%"/>
        </div>
    </body>
</html>

I resolved the above problem using jquery below:

$(document).ready(function(e) {
        var imgs = document.getElementsByTagName('img');
        var imgLength = imgs.length;

        for(var i=0; i<= imgLength-1;i++){

            var imgWidth = imgs[i].clientWidth;
            var imgHeight = imgs[i].clientHeight;

            $('img').eq(i).attr({width:imgWidth/2, height: imgHeight/2});

            console.log(imgWidth);
        }

        console.log(imgLength); 

    });

Solution 1:

You did not do anything wrong here, it will any other thing that is overriding the image size.

You can check this working fiddle.

And in this fiddle I have alter the image size using %, and it is working.

Also try using this code:

<img src="image.jpg" style="width: 50%; height: 50%"/>

Here is the example fiddle.

Solution 2:

We can do this by css3 too. Try this:

.halfsize {
    -moz-transform:scale(0.5);
    -webkit-transform:scale(0.5);
    transform:scale(0.5);
}

<img class="halfsize" src="image4.jpg">

subjected to browser compatibility

Solution 3:

The percentage setting does not take into account the original image size. From w3schools :

In HTML 4.01, the width could be defined in pixels or in % of the containing element. In HTML5, the value must be in pixels.

Also, good practice advice from the same source :

Tip: Downsizing a large image with the height and width attributes forces a user to download the large image (even if it looks small on the page). To avoid this, rescale the image with a program before using it on a page.

Image re-size to 50% of original size in HTML

Solution 1:

Solution 2:

Solution 3:

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