What is the purpose of the -webkit-text-size-adjust property in CSS?

Can someone help me comprehend the purpose of using -webkit-text-size-adjust:none;.

I have noticed that adding or removing this code does not make any difference in font sizes on Android (Chrome) or iOS (Safari and Chrome). Is there a specific reason for its use?

Answer №1

-webkit-text-size-adjust

When it comes to resizing text on a browser page, the use of auto or 100% is generally recommended as the web browser handles text resizing more effectively. It's worth noting that this property is considered non-standard according to the Mozilla developers page.

For further information on this topic, check out this informative article.

Interestingly, developers utilizing Twitter Bootstrap should know that Bootstrap automatically sets -webkit-text-size-adjust: 100%. More details can be found here.

Edit

It's important to note that in Chrome on android phones, font boosting is activated which means that -webkit-text-size-adjust is ignored regardless of the value you specify. To disable font boosting, try setting max-height to a large value like 100000px. Additional information on this issue can be found here.

Answer №2

The -webkit-text-size-adjust is a unique feature that allows for adjusting the size of text content specifically in Safari on iPhone. This experimental technology offers three different types of values to choose from:

  • none: No adjustment is made to the text size.

  • auto (default): The text size is automatically adjusted for Safari on iPhone.

  • A specific percentage size at which to display text in Safari on iPhone.

This CSS property is supported by only a few mobile browsers, in addition to iOS. To see compatibility details, you can visit this link

Answer №3

No official specification for the -webkit-text-size-adjust property seems to be available, but there is an unofficial description, suggesting it functions in Safari on iPhone.

As per the CSS Mobile Text Size Adjustment Module Level (Editor’s Draft), the default value for -webkit-text-size-adjust is auto. Therefore, setting it to -webkit-text-size-adjust:none will only have an impact if it overrides a different specified value. It is assumed that -webkit-text-size-adjust operates similarly to the proposed text-size-adjust property.

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