Why Are Font Sizes Larger Than Expected in Safari on iPhone?

Font Scaling Inconsistencies in Safari on the iPhone

In certain scenarios, users have encountered discrepancies in font sizes rendered in Safari on the iPhone. Font sizes appear larger than expected, even when specified with lower values. This behavior has raised questions about potential CSS or technical limitations.

Explanation:

Safari on iPhones employs an automatic text scaling mechanism that aims to improve readability on smaller screens. This feature, however, can lead to inconsistencies when specific font sizes appear larger than others, despite their numerical differences. This happens particularly when the specified font size is considered too small for optimal legibility.

Solution:

To resolve this issue, use the CSS property -webkit-text-size-adjust. This property allows you to override the automatic text scaling of Mobile Safari. To disable the scaling for the iPhone, apply the following CSS:

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

By setting the -webkit-text-size-adjust property to 100%, you instruct Safari not to scale the text within the body element for the iPhone. This ensures that all specified font sizes, including those set to 13px and 15px, are rendered without modification.

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