The fascinating CSS Circle interaction on mouse click or hover

I am encountering a challenge with my circular element:

Here is the HTML code for it:

<div id="quadrant-sizer"></div>

And here is the CSS styling:

#quadrant-sizer {
    width: 40px;
    height: 40px;
    border-radius: 999px;
}

The issue I'm facing is that when the mouse pointer is outside of the circle but still within the height and width of the box, it behaves as if it's on the circle. Essentially, I want the interaction with the circle to only occur when the mouse is actually on the circle itself. If achieving this behavior isn't possible using just HTML/CSS, would there be a way to implement it using JavaScript?

You can view and interact with an example of my issue here.

For a more visual representation, check out this example.

Answer №1

What happens if you modify the CSS rule to this:

#quadrant-sizer {
    width: 40px;
    height: 40px;
    border-radius: 50%; /* updated */
}

Update:

It appears that the issue might be related to the browser version being used. It seems to be functioning correctly in Canary 30, but not in Chrome 27 and 28. Works fine in Aurora 24.

Answer №2

To implement this using JavaScript, the key is detecting if the mouse pointer lies within the boundaries of the circle. Refer to THIS EQUATION for the necessary calculation.

Answer №3

Modern web browsers sometimes struggle with rendering rounded corners consistently, but progress is being made in resolving this issue.

Creating a circular interactive area using HTML can be achieved using the <map> element with <area shape="circle">. However, JavaScript may still be necessary for more complex interactions beyond simply opening a link.

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