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Read Ben Frain‘s Post The iOS Safari menu bar is hostile to web apps: discuss first!

Mobile Safari's 100% Height Dilemma

Whether you're developing a web application with native-ish UI, or just a simple modal popup overlay that covers the viewport, when it comes to making things work on iDevices in Mobile Safari, you're in for a decent amount of pain and suffering. Making something "100% height" is not as easy as it seems.

This post is a collection of Mobile Safari's gotchas and quirks on that topic, some with solutions and fixes, some without, in good parts pulled from various sources across the internets, to have it all in one place. Things discussed here apply to iOS8, iOS9 and iOS10.

The Disappearing Browser Chrome

Screen real estate on smartphones is limited, so Mobile Safari collapses the browser chrome (address bar and optional tab bar at the top, and tool bar at the bottom) when the user scrolls down. When you

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function trimSvgWhitespace() {

  // get all SVG objects in the DOM
  var svgs = document.getElementsByTagName("svg");

  // go through each one and add a viewbox that ensures all children are visible
  for (var i=0, l=svgs.length; i<l; i++) {

    var svg = svgs[i],
        box = svg.getBBox(), // <- get the visual boundary required to view all children