The font size on mobile webkit suddenly grows larger without warning

Currently in the process of enhancing a website for mobile devices, and I'm almost finished (yay!) but there's one specific issue that is really challenging:

The Method

I decided to use CSS to transform a tab bar (which is essentially a list) into a dropdown menu functionality. By using jQuery, when the only visible list element is touched, it toggles the class "open" on the ul-element, revealing all list elements. That's how it operates.

The Dilemma

Upon expanding the dropdown menu, the font size unexpectedly increases from 15px to 19px. Even after inspecting the code thoroughly, there are no clues as to why this change occurs. Adding a rule like font-size: 15px !important; does not resolve the issue.

To illustrate the problem, I have created a short screencast for your reference: http://youtu.be/MUTJfTK70PE?hd=1

Affected Devices

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

Remarkably, Windows Phone (Internet Explorer) is not impacted by this discrepancy (wow!)

I would greatly appreciate any insights or suggestions on solving this perplexing issue!!

androidioscsswebkitmobile-webkit

Answer №1

One suggestion to consider is implementing the following: font-size: 1.5rem;

Answer №2

After some investigation, it was discovered that the root cause of the issue was font resizing in Mobile Webkits. To fix this, we implemented the following rule:

-webkit-text-size-adjust: none;

Answer №3

To address this issue in html5, it is recommended to explicitly define the viewport in the page header. By utilizing the following code snippet:

<meta name="viewport" content="width=device-width, initial-scale=1.0">

you can disable mobile font resizing. However, setting text-size-adjust to none has its drawbacks as it can lead to zoom functionality being disabled on mobile devices. Additionally, heavy prefixing may be required and some browsers may ignore the value "none."

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