CSS text-combine-upright

The CSS text-combine-upright property specifies the combination of multiple typographic character units into the space of a single typographic character unit.

If the combined text is wider than 1em, the contents are fitted within 1em.

The text-combine-upright property only has an effect in vertical writing modes. You can use text-combine-upright in conjunction with the writing-mode property to specify how multiple characters fit into a single space.


Which means that it can be either of those two values.

In other words, it can be either of the following:

Possible Values

Below is an explanation of the values.

No special processing.
Attempt to typeset horizontally all consecutive typographic character units within the box such that they take up the space of a single typographic character unit within the vertical line box.

In addition, all CSS properties also accept the following CSS-wide keyword values as the sole component of their property value:

Represents the value specified as the property's initial value.
Represents the computed value of the property on the element's parent.
This value acts as either inherit or initial, depending on whether the property is inherited or not. In other words, it sets all properties to their parent value if they are inheritable or to their initial value if not inheritable.

Basic Property Information

Initial Value
Applies To
Non-replaced inline elements
Not animatable

CSS Specifications

The text-combine-upright property is defined in CSS Writing Modes Level 3 (W3C Recommendation, 10 December 2019)

Vendor Prefixes

For maximum browser compatibility many web developers add browser-specific properties by using extensions such as -webkit- for Safari, Google Chrome, and Opera (newer versions), -ms- for Internet Explorer, -moz- for Firefox, -o- for older versions of Opera etc. As with any CSS property, if a browser doesn't support a proprietary extension, it will simply ignore it.

This practice is not recommended by the W3C, however in many cases, the only way you can test a property is to include the CSS extension that is compatible with your browser.

The major browser manufacturers generally strive to adhere to the W3C specifications, and when they support a non-prefixed property, they typically remove the prefixed version. Also, W3C advises vendors to remove their prefixes for properties that reach Candidate Recommendation status.

Many developers use Autoprefixer, which is a postprocessor for CSS. Autoprefixer automatically adds vendor prefixes to your CSS so that you don't need to. It also removes old, unnecessary prefixes from your CSS.

You can also use Autoprefixer with preprocessors such as Less and Sass.