Why Does Position: Fixed Not Work in Mobile Browsers and How Can I Fix It?

Position Fixed Not Working in Mobile Browsers

Background

Web developers often encounter challenges when attempting to position elements fixed within mobile browsers. The CSS property position: fixed allows elements to maintain their position even when the surrounding content scrolls. However, this feature has historically been problematic in older versions of iOS and Android.

Issue

In mobile browsers such as iOS versions prior to 5 and Android versions earlier than 4, the position: fixed property malfunctions. Elements assigned this property will still scroll along with the page content, negating the intended "fixed" positioning effect.

Solution

To address this issue, experienced developers have devised a pragmatic solution that consistently works in multiple mobile browsers:

Utilizing -webkit-backface-visibility: hidden;

The key to solving this problem lies in the CSS property -webkit-backface-visibility. By setting this to hidden, we essentially force the browser to maintain the element's front façade. This prevents it from becoming obscured or influenced by underlying content, ensuring that it remains "fixed" on the screen.

Example

To illustrate this solution in action, consider the following code snippet:

<code class="css">.fixed {
  position: fixed;
  top: 0px;
  left: 0px;
  width: 320px;
  height: 50px;
  background: red;
  -webkit-backface-visibility: hidden; /* Most Important */
}</code>

<code class="html"><div class="fixed">
  Hi I'm Position Fixed
</div></code>

When applied to a web page, this code will create a red rectangle with fixed positioning. It will remain in the same location on the screen, even when the page is scrolled.

Note: It's worth mentioning that this solution primarily resolves the issue in iOS and Android devices. For other browsers, alternate approaches may be necessary.

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