The fixed position seems to be malfunctioning and behaving more like absolute

I have a simple question. I am currently designing a mobile version of a page, and we are trying to keep the "snag it" yellow button fixed at the bottom. However, the 'position: fixed' property is not working as expected; it's behaving like 'position: absolute' instead.

The specific page I am working on is:

Thank you, Luiz

Answer №1

The problem here is related to the .content-container wrapper class, which includes a CSS rule of

webkit-transform: translate3d(0,0,0)
. This transform rule, as explained in this post, changes the positioning context from the viewport to the rotated element, causing the fixed element to behave as if it were absolutely positioned. Below is an example that demonstrates the difference between having a fixed element inside a transformed div versus having it outside.

.rotate {
  transform: rotate(30deg);
  background: blue;
  width: 300px;
  height: 300px;
  margin: 0 auto;
}
.fixed {
  position: fixed;
  background: red;
  padding: 10px;
  color: white;
  top: 50px;
}
<div class="rotate">
  <div class="fixed"> I am fixed inside a rotated div.</div>
</div>
<div class="fixed"> I am fixed outside a rotated div.</div>

To resolve this issue, you will need to eliminate the transform3d declaration from the .content-container class.

Answer №2

Curious minds may be wondering if the behavior described is a result of a browser bug. Interestingly enough, it seems to align with current W3C specifications. Initially, there was inconsistency across different browsers, with some functioning as expected while others followed what seemed like counterintuitive W3C rules. The reasoning behind this change remains ambiguous - whether it's intentional logic, a byproduct of implementation challenges, or simply an oversight.

Furthermore, the use of position: fixed can be disrupted not only by transform, but also by applying the filter and perspective properties to any ancestor element. More information on this issue can be found here.

For additional insights into this matter, refer to the following sources: https://www.w3.org/TR/css-transforms-1/#propdef-transform, https://www.w3.org/Bugs/Public/show_bug.cgi?id=16328, and https://github.com/w3c/csswg-drafts/issues/913.

Answer №3

The issue I encountered stemmed from combining a css transform with overflow: auto; on the parent element.

To resolve it, I introduced a new child element and transferred the overflow property to that element instead.

This separation of properties successfully resolved the problem at hand.

Answer №4

This problem seems to be specific to mobile devices. I've faced this issue in the past as well. Mobile browsers, especially older ones, tend to limit the use of fixed positioning due to its tendency to occupy a large amount of screen space.

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