Скачать или смотреть Understanding the Behavior of pointer-events: none in CSS Overlays

Explore the nuances of CSS `pointer-events` and overcoming overlay hover challenges in web design.
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This video is based on the question https://stackoverflow.com/q/64458480/ asked by the user 'Takeshi Tokugawa YD' ( https://stackoverflow.com/u/4818123/ ) and on the answer https://stackoverflow.com/a/64458853/ provided by the user 'jjakkubb' ( https://stackoverflow.com/u/13197039/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Understanding the Behavior of pointer-events: none in CSS Overlays

When building web interfaces, developers often use overlays to enhance user experience by adding visual effects or interactivity. However, a common issue can arise when an absolutely positioned overlay unexpectedly passes hover events to its parent element. Let’s delve into the specifics of this problem and explore an effective solution.

The Problem Explained

Imagine you have an overlay covering a specific area on your webpage. You expect that the overlay, having the CSS rule pointer-events: none, won’t interfere with interactions on elements beneath it. However, you notice that the parent element still reacts to hover events. This issue can be perplexing at first, as you expect the overlay to block such interactions.

Here’s a basic example of the problematic code:

[[See Video to Reveal this Text or Code Snippet]]

And the corresponding CSS:

[[See Video to Reveal this Text or Code Snippet]]

What’s Happening Here?

In this setup, the overlay (.overlay) is positioned directly over the parent element (.positioner). Despite pointer-events: none, the hover effect on .positioner still activates. Why? Because when you hover over the overlay, you are technically also hovering over its parent element. The two elements overlap, and thus, interactions still work as if you are directly interacting with .positioner.

The Solution

To solve the issue of preventing the parent from receiving hover events, you need to adjust the positioning of the overlay. Here’s how to effectively change your code:

Step 1: Rearrange the Overlay Position

Instead of placing the overlay directly over the parent element, you can adjust its position so it does not overlap the interaction area. Here’s the revised CSS:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Testing Your Implementation

With this adjustment, the overlay will appear visually above its parent without interfering with hover events on .positioner. When you hover over the transparent overlay, it will not register any interaction with the parent element, allowing you to achieve the desired effect successfully.

Conclusion

Understanding how CSS positioning and pointer-events interact can save developers a lot of time and headaches. By rearranging the layering of elements and their respective positions, you can control how hover and click events are processed. Remember, overlays are powerful tools, but placing them correctly is crucial to ensuring they function as intended.

Feel free to experiment with these settings to see how they impact your web design, and watch as other unexpected behaviors may surface!