Position fixed not working in mobile browser

position: fixed doesn't work in most of the older versions of iOS and Blackberry. I have tried this fix in most of the mobile browsers and it worked smoothly without any JavaScript plugins.

Use -webkit-backface-visibility: hidden;

.fixed {
  position: fixed;
  top: 0px;
  left: 0px;
  width: 320px;
  height: 50px;
  background: red;
  -webkit-backface-visibility: hidden;
  /*--^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Most Important*/
}
<div class="fixed">
  Hi I m Position Fixed
</div>
<div>
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</div>