IE11 alternative for the CSS property "unset"

I have a div fixed to a specific location on my webpage using the following CSS properties:

width: 320px;
height: 160px;
position: fixed;
right: 15px;
bottom: 15px;
top: unset;
z-index: -1;

While the div displays correctly in other browsers, in Internet Explorer 11 it appears at the top right corner of the page. I suspect this issue is caused by the lack of support for top: unset; in IE.

Are there any alternative CSS or JS solutions that can achieve the same fixed positioning across different browsers?

csshtmlinternet-explorer-11

Answer №1

It appears that you need to find top: auto.

Answer №2

Even though using top:auto may seem like a solution for the top property, it's important to note that auto is not simply a stand-in for unset or initial in CSS.

For instance, the default value for max-width is none (source). Similarly, the default value for background-color is transparent (source). Each CSS property has its own unique initial value, which must be explicitly defined for compatibility with IE.

You can find the initial values for CSS properties on websites like MDN and w3schools (referred to as "default values" on the latter). This information is essential for understanding how CSS behaves in different browsers, especially when seeking alternatives to specific declarations like "unset" in IE11.

Answer №3

For my situation, using top: auto did not solve the issue; instead, I found success using a bottom value. Interestingly, the default value of position: static worked perfectly in Internet Explorer 11 for me.

Answer №4

The initial setting is fixed.

Facing a similar problem, I took action

position: inherit; and replaced it with position: fixed;

In your scenario, you may opt for top: fixed;

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