androidioscsswebkitmobile-webkit

font-size increases unexpectedly in mobile webkit

I'm working on optimizing a website for mobile devices, and I'm nearly done (yay!) but one thing makes me rack my brain:

How it works

I used CSS to restyle a tab-bar (actually a list) to work like a dropdown-menu. When touching the only visible list element, jQuery toggles the class "open" on the ul-element and all list elements appear also. That's how it works.

The Problem

When unfolding the dropdown-menu, it's font-size increases from 15px to 19px. And in Inspector there is absolutely no hint why this happens. Adding a rule like font-size: 15px !important; has no effect.

I made a little screencast for you: http://youtu.be/MUTJfTK70PE?hd=1

Affected devices

  1. Android (Samsung Galaxy)
  2. iOS (iPod, iPhone, Simulator)

Windows Phone (Internet Explorer) is not affected (wow!)

I would be very thankful for every single idea!!

Solution

  • It turned out, that Mobile Webkits font resizing was the origin. This rule solved it:

    -webkit-text-size-adjust: none;