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.
Try it
Syntax
css
/* 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: revert;
text-underline-position: revert-layer;
text-underline-position: unset;
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
.
Formal definition
Initial value | auto |
---|---|
Applies to | all elements |
Inherited | yes |
Computed value | as specified |
Animation type | discrete |
Formal syntax
Examples
A simple example
Let's take a couple of simple example paragraphs:
html
<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:
css
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.
css
:root {
text-underline-position: under;
}
Specifications
Specification |
---|
CSS Text Decoration Module Level 3 # text-underline-position-property |
Browser compatibility
BCD tables only load in the browser
See also
- The
text-decoration
property is a shorthand for setting most text-decoration properties, includingtext-decoration-line
,text-decoration-color
, andtext-decoration-style
. However, it does not settext-underline-position
.