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text-underline-position

The text-underline-position CSS property specifies the position of the underline which is set using the text-decoration property's underline value.

Syntax

/* Single keyword */
text-underline-position: auto;
text-underline-position: under;
text-underline-position: left;
text-underline-position: right;

/* Multiple keywords */
text-underline-position: under left;
text-underline-position: right under;

/* Global values */
text-underline-position: inherit;
text-underline-position: initial;
text-underline-position: unset;

Syntax

Values

auto
The user agent uses its own algorithm to place the line at or under the alphabetic baseline.
from-font
If the font file includes information about a preferred position, use that value. If the font file doesn't include this information, behave as if auto was set, with the browser choosing an appropriate position.
under
Forces the line to be set below the alphabetic baseline, at a position where it won't cross any descenders. This is useful for ensuring legibility with chemical and mathematical formulas, which make a large use of subscripts.
left
In vertical writing-modes, this keyword forces the line to be placed on the left side of the text. In horizontal writing-modes, it is a synonym of under.
right
In vertical writing-modes, this keyword forces the line to be placed on the right side of the text. In horizontal writing-modes, it is a synonym of under.
auto-pos
A synonym of auto, which should be used instead.
above
Forces the line to be above the text. When used with East-Asian text, using the auto keyword will lead to a similar effect.
below
Forces the line to be below the text. When used with alphabetic text, using the auto keyword will lead to a similar effect.

Formal definition

Initial value auto
Applies to all elements
Inherited yes
Computed value as specified
Animation type discrete

Formal syntax

auto | from-font | [ under || [ left | right ] ]

Examples

A simple example

Let's take a couple of simple example paragraphs:

<p class="horizontal">Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Nullam consectetur ac turpis vel laoreet. Nullam volutpat pharetra lorem, sit 
amet feugiat tortor volutpat quis. Nam eget sodales quam. Aliquam accumsan 
tellus ac erat posuere.</p>

<p class="vertical">Lorem ipsum dolor sit amet, consectetur adipiscing elit. 
Nullam consectetur ac turpis vel laoreet. Nullam volutpat pharetra lorem, sit 
amet feugiat tortor volutpat quis. Nam eget sodales quam. Aliquam accumsan 
tellus ac erat posuere.</p>

Our CSS looks like this:

p {
  font-size: 1.5rem;
  text-transform: capitalize;
  text-decoration: underline;
  text-decoration-thickness: 2px;
}

.horizontal {
  text-underline-position: under;
}

.vertical {
  writing-mode: vertical-rl;
  text-underline-position: left;
}

In this example we set both the paragraphs to have a thick underline. In the horizontal text we use text-underline-position: under; to put the underline below all the descenders.

In the text with a vertical writing-mode set, we can then use values of left or right to make the underline appear on the left or right of the text as required.

The live example looks like this:

Setting text-underline-position globally

Because the text-underline-position property inherits and is not reset by the text-decoration shorthand property, it may be appropriate to set its value at a global level. For example, the under value may be appropriate for a document with lots of chemical and mathematical formulas, which make a large use of subscripts.

:root {
  text-underline-position: under;
}

Specifications

Specification Status Comment
CSS Text Decoration Module Level 3
The definition of 'text-underline-position' in that specification.
Candidate Recommendation Initial definition

Browser compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
text-underline-position 33 12 74 6 20 12.1
12.1
9
Prefixed
Prefixed Implemented with the vendor prefix: -webkit-
above and below No 12 — 79 74 6 No No
auto-pos No 12 — 79 No 6 No No
from-font No No 74 No No No
left and right 71 79 74 No 58 No
under 33 79 74 No 20 12.1
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
text-underline-position 4.4.3 33 No 20 No 2.0
above and below No No No No No No
auto-pos No No No No No No
from-font No No No No No No
left and right 71 71 No 50 No 10.0
under 4.4.3 33 No 20 No 2.0

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/text-underline-position