What is the best way to horizontally align a fixed dialog element using the right property?

I have been experimenting with positioning HTML elements using the position: fixed; and right CSS properties, as outlined in the MDN Web Docs. However, I have noticed that this approach does not work as expected when trying to position a dialog element. While I found a workaround by using margin-left: auto, I am left wondering why the dialog element does not stick to the right side like a regular div. It seems to align correctly when positioned at the top, bottom, or left. I am currently working with Chromium.

dialog,
div {
  position: fixed;
  right: 0;
  margin: 0;
}

dialog {
  /*margin-left: auto;*/
}
<dialog open>dialog</dialog>
<div>div</div>

htmlcss

Answer №1

When looking at the dialog element, it seems that the 

inset-inline-start: 0px; inset-inline-end: 0px;
values defined in the browser stylesheet play a significant role in influencing its behavior.

If you refer to https://developer.mozilla.org/en-US/docs/Web/CSS/inset-inline-start, you will find an explanation:

The CSS property inset-inline-start determines the logical inline start inset of an element, which translates into a physical offset based on the element's writing mode, directionality, and text orientation. This is equivalent to setting values for top, right, bottom, or left properties depending on the specified writing-mode, direction, and text-orientation.

In scenarios with normal writing mode and direction, the impact should be akin to having both left and right set to 0.

For instance, in your provided example, along with right: 0;, you would need to incorporate left: auto to essentially "override" this setting.

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