position an element at a higher level than the #top-layer

I developed a custom tool and utilized z-index to position it above all other elements:

.customTool {
  position: fixed;
  z-index: 99999;
}

However, this functionality stops working when a modal <dialog /> element is opened in modal mode.

As a result, users are unable to interact with the .customTool.

This issue arises due to the introduction of the new #top-layer concept that sits on top of all other elements: https://developer.chrome.com/blog/what-is-the-top-layer/

Is there a way to ensure that my custom tool always remains on top of all elements (even modal dialogs) and remains interactive?

htmlcss

Answer №1

From what I understand, it is not possible to directly manipulate the top layer according to the current W3C specs draft:

NOTE: The top layer is managed entirely by the user agent and cannot be manipulated by authors.

One potential workaround could involve using an element that renders in the top layer, such as wrapping .devTools in a <dialog> as the last element. This approach is based on the same specifications:

Top layer elements are rendered in the order they appear in the top layer, with the last element being displayed on top of everything else.

It's essential to consider that your solution may encounter challenges due to the z-index value relative to the stacking context. A lower z-index value within a higher stacking context could potentially place another element on top of yours.

Answer №2

One way to make the <dialog> non-modal is by utilizing the .show() method instead of .showModal(). By doing this, the dialog will adhere to normal stacking rules and the z-index property can be utilized once again.

Answer №3

To display the .divTool above the dialog, you can create a second dialog and place the .divTool element inside it. Then, adjust the code to open the second dialog whenever the first dialog is opened. This will ensure that the last opened dialog remains on top of all other elements. For more information on managing dialogs and top-layer elements, check out this informative article: Top Layer vs Z-Index for Frontend UI Dialogs

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