Why Does My Font Size Change in iPhone Safari, and How Can I Control It?

iPhone Safari Font Size Rendering Discrepancy

In certain instances, Safari on the iPhone has been observed to disregard some font-size settings, resulting in unexpected font size variations. This issue prompts the question: why does this occur and are there elements that lack font-size support in Safari/iPhone?

Explanation:

The observed font size discrepancy stems from a mechanism in Mobile Safari that automatically scales text it deems too small for optimal readability. This behavior aims to improve the reading experience on smaller smartphone screens.

Solution:

To override this automatic scaling and enforce the desired font size, you can utilize the CSS property -webkit-text-size-adjust. By setting its value to 100%, you can ensure that text will be rendered at its specified font size, even on the iPhone.

Here's a code snippet demonstrating how to apply this solution:

<code class="css">@media screen and (max-device-width: 480px){
  body{
    -webkit-text-size-adjust: 100%;
  }
}</code>

By incorporating this code into your CSS, you can control text rendering on the iPhone and prevent Safari from altering font sizes intended for other devices or circumstances.

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