Why Does 'Position:Fixed' Not Work When Viewed in an 'Iframe' Using an iPhone or iOS Device

position: fixed is not working in iOS when loading Angular site inside iframe in Ionic 3

put this css in your style.css

body {
    margin: 0px;
}
h3 {
  color: white;
  padding:0px 50px;
}
my-app{
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
}

app-header,app-home,app-footer{
  position: absolute;
  left: 0;
  width: 100%;
}
app-header,app-footer{
  text-align: center;
  color: white;
  height: 50px;
   background-color:#47454b;
}
app-header{
  top:0;
}
app-footer{
  bottom:0;
}
app-home {
  top: 50px;
  bottom: 50px;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

remove all css of header.component.css and footer.component.css

here is stackblitz link https://stackblitz.com/edit/angular-load-ionic-iframe-knkgq4?file=src%2Fstyles.css

Mobile Safari - iframe fixed content

I faced this challenge couple of months back while working on a webapp, After researching quiet a bit, The "Shadow DOM "approach suggested in the following article helped.

https://medium.com/@dvoytenko/amp-ios-scrolling-redo-2-the-shadow-wrapper-approach-experimental-3362ed3c2fa2.

 var sd = document.body.attachShadow({mode: 'open'});

 // Main slot will absorb all undistributed children.
 var mainSlot = document.createElement('slot');
 var scroller = document.createElement('div');
 scroller.style = 'background: lightblue; position: absolute; top: 
  0; left: 0; right: 0; bottom: 0; overflow-x: hidden; overflow-y: auto; -webkit-overflow-scrolling: touch;';
  scroller.appendChild(mainSlot);
  sd.appendChild(scroller);

// Selectively, it's also possible to distribute fixed elements separately,
// emulating fixed layer transfer.
 var fixedLayer = document.createElement('div');
 fixedLayer.style = 'height: 0; width: 0; position: fixed; 
  overflow:visible;';
 sd.appendChild(fixedLayer);

 var mainFixedSlot = document.createElement('slot');
 mainFixedSlot.setAttribute('name', 'fixed');
 fixedLayer.appendChild(mainFixedSlot);

function addToFixedLayer(element) {
 //var slotId = String(Math.random());
 //var fixedSlot = document.createElement('slot');
 //fixedSlot.setAttribute('name', slotId);
 //fixedLayer.appendChild(fixedSlot);
 //element.setAttribute('slot', slotId);
 element.setAttribute('slot', 'fixed');
} 

 /*Call and pass fixed elemetns to addToFixedLayer method so that they stay 
 fixed while scrolling */

 addToFixedLayer(fixedDivId)

Check this demo https://jsfiddle.net/rsva63ep/

position: fixed doesn't work on iPad and iPhone

I ended up using the new jQuery Mobile v1.1: http://jquerymobile.com/blog/2012/04/13/announcing-jquery-mobile-1-1-0/

We now have a solid re-write that provides true fixed toolbars on the
a lot of popular platforms and safely falls back to static toolbar
positioning in other browsers.

The coolest part about this approach is that, unlike JS-based
solutions that impose the unnatural scrolling physics across all
platforms, our scrolling feels 100% native because it is. This means
that scrolling feels right everywhere and works with touch, mousewheel
and keyboard user input. As a bonus, our CSS-based solution is super
lightweight and doesn’t impact compatibility or accessibility.

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