Why Does Safari's Border Radius Behavior Differ from Other Browsers?

Browser Border Radius Inconsistency: Safari's Surprising Behavior

In the process of styling a website, we encountered a particularly troublesome issue. While developing a feature that displayed user profile images with rounded corners, everything seemed to work seamlessly in Internet Explorer 8 and above, Google Chrome, and Mozilla Firefox. However, Safari exhibited a rather peculiar behavior.

To demonstrate this issue, we created an image with a 3px border and applied a border radius of 50%. Everything looked normal until we opened the same page in Safari. The border did not appear as a perfect circle but rather truncated the image, leading to an undesirable visual effect.

Upon further investigation, we realized that Safari's interpretation of border radius differed from the other browsers. While IE, Chrome, and Firefox cropped the border from the center of the image, Safari cropped it from the outermost boundary of the element. This distinction resulted in an unintended truncation of the image itself.

To resolve this issue, we implemented a workaround that separated the border from the image. By placing the image within a container, we were able to apply border radius to both the image and the container, ensuring that both had rounded corners.

Here's a snippet of the HTML and CSS code that fixed the issue in Safari:

<div class="activity_rounded"><img src="http://placehold.it/100" /></div>

.activity_rounded {
    display: inline-block;
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
    -khtml-border-radius: 50%;
    border: 3px solid #fff;
}

.activity_rounded img {
    -webkit-border-radius: 50%;
    -moz-border-radius: 50%;
    border-radius: 50%;
    -khtml-border-radius: 50%;
    vertical-align: middle;
}

With this approach, Safari now displayed the user profile image with a perfect circular border, consistent with the other browsers. Additionally, you can test this solution in our live demo to see it in action.

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