text-size-adjust
Quick Summary for text-size-adjust
Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
Code Usage for text-size-adjust
/* Keyword values */ text-size-adjust: none; text-size-adjust: auto;  /* <percentage> value */ text-size-adjust: 80%;  /* Global values */ text-size-adjust: inherit; text-size-adjust: initial; text-size-adjust: revert; text-size-adjust: unset; 
More Details for text-size-adjust

text-size-adjust

Experimental: This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.

The text-size-adjust CSS property controls the text inflation algorithm used on some smartphones and tablets. Other browsers will ignore this property.

/* Keyword values */ text-size-adjust: none; text-size-adjust: auto;  /* <percentage> value */ text-size-adjust: 80%;  /* Global values */ text-size-adjust: inherit; text-size-adjust: initial; text-size-adjust: revert; text-size-adjust: unset; 

Because many websites have not been developed with small devices in mind, mobile browsers differ from desktop browsers in the way they render web pages. Instead of laying out pages at the width of the device screen, they lay them out using a viewport that is much wider, usually 800 or 1000 pixels. To map the extra-wide layout back to the original device size, they either show only part of the whole render or scale the viewport down to fit.

Since text that has been scaled down to fit a mobile screen may be very small, many mobile browsers apply a text inflation algorithm to enlarge the text to make it more readable. When an element containing text uses 100% of the screen's width, the algorithm increases its text size, but without modifying the layout. The text-size-adjust property allows web authors to disable or modify this behavior, as web pages designed with small screens in mind do not need it.

Syntax

The text-size-adjust property is specified as none, auto, or a <percentage>.

Values

none

Disables the browser's inflation algorithm.

auto

Enables the browser's inflation algorithm. This value is used to cancel a none value previously set with CSS.

<percentage>

Enables the browser's inflation algorithm, specifying a percentage value with which to increase the font size.

Formal definition

Initial valueauto for smartphone browsers supporting inflation, none in other cases (and then not modifiable).
Applies toall elements
Inheritedyes
Percentagesyes, refer to the corresponding size of the text font
Computed valueas specified
Animation typediscrete

Formal syntax

none | auto | <percentage>

Examples

Basic disabling usage

As hinted at above, on a properly designed responsive site the text-size-adjust behavior is not needed, so developers can elect to turn it off by specifying a value of none:

p {   -webkit-text-size-adjust: none;   text-size-adjust: none; } 

Specifications

Specification
CSS Mobile Text Size Adjustment Module Level 1 # adjustment-control

See also

Apple's documentation Gecko's behavior description, by L. David Baron Microsoft's documentation

Last modified: Aug 12, 2021, by MDN contributors

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