text-transform - CSS: Cascading Style Sheets 编辑

The text-transform CSS property specifies how to capitalize an element's text. It can be used to make text appear in all-uppercase or all-lowercase, or with each word capitalized. It also can help improve legibility for ruby.

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The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.

The text-transform property takes into account language-specific case mapping rules such as the following:

• In Turkic languages, like Turkish (tr), Azerbaijani (az), Crimean Tatar (crh), Volga Tatar (tt), and Bashkir (ba), there are two kinds of i, with and without the dot, and two case pairings: i/İ and ı/I.

• In German (de), the ß becomes SS in uppercase.

• In Dutch (nl), the ij digraph becomes IJ, even with text-transform: capitalize, which only puts the first letter of a word in uppercase.

• In Greek (el), vowels lose their accent when the whole word is in uppercase (ά/Α), except for the disjunctive eta (ή/Ή). Also, diphthongs with an accent on the first vowel lose the accent and gain a diaeresis on the second vowel (άι/ΑΪ).

• In Greek (el), the lowercase sigma character has two forms: σ and ς. ς is used only when sigma terminates a word. When applying text-transform: lowercase to an uppercase sigma (Σ), the browser needs to choose the right lowercase form based on context.

• in Irish (ga), certain prefixed letters remain in lowercase when the base initial is capitalized, so for example text-transform: uppercase will change ar aon tslí to AR AON tSLÍ and not, as one might expect, AR AON TSLÍ (Firefox only). In some cases, a hyphen is also removed upon uppercasing: an t-uisce transforms to AN tUISCE (and the hyphen is correctly reinserted by text-transform: lowercase).

The language is defined by the lang HTML attribute or the xml:lang XML attribute.

Note: Support for language-specific cases varies between browsers, so check the browser compatibility table.

Syntax

/* Keyword values */
text-transform: none;
text-transform: capitalize;
text-transform: uppercase;
text-transform: lowercase;
text-transform: full-width;
text-transform: full-size-kana;

/* Global values */
text-transform: inherit;
text-transform: initial;
text-transform: unset;

capitalize

Is a keyword that converts the first letter of each word to uppercase. Other characters remain unchanged (they retain their original case as written in the element's text). A letter is defined as a character that is part of Unicode's Letter or Number general categories ; thus, any punctuation marks or symbols at the beginning of a word are ignored.

Authors should not expect capitalize to follow language-specific title casing conventions (such as skipping articles in English). The capitalize keyword was under-specified in CSS 1 and CSS 2.1. This resulted in differences between browsers in the way the first letter was calculated (Firefox considered - and _ as letters, but other browsers did not. Both Webkit and Gecko incorrectly considered letter-based symbols like ⓐ to be real letters. Internet Explorer 9 was the closest to the CSS 2 definition, but with some weird cases.) By precisely defining the correct behavior, CSS Text Level 3 cleans this mess up. The capitalize line in the browser compatibility table contains the version the different engines started to support this now precisely-defined behavior.

uppercase

Is a keyword that converts all characters to uppercase.

lowercase

Is a keyword that converts all characters to lowercase.

none

Is a keyword that prevents the case of all characters from being changed.

full-width

Is a keyword that forces the writing of a character — mainly ideograms and Latin scripts — inside a square, allowing them to be aligned in the usual East Asian scripts (like Chinese or Japanese).

full-size-kana

Generally used for <ruby> annotation text, the keyword converts all small Kana characters to the equivalent full-size Kana, to compensate for legibility issues at the small font sizes typically used in ruby.

Accessibility concerns

Large sections of text set with a text-transform value of uppercase may be difficult for people with cognitive concerns such as Dyslexia to read.

• MDN Understanding WCAG, Guideline 1.4 explanations
• W3C Understanding WCAG 2.1

Formal definition

Initial value	none
Applies to	all elements. It also applies to ::first-letter and ::first-line.
Inherited	yes
Computed value	as specified
Animation type	discrete

Formal syntax

none | capitalize | uppercase | lowercase | full-width | full-size-kana

Examples

none

<p>Initial String
  <strong>Lorem ipsum dolor sit amet, consectetur adipisicing elit, ...</strong>
</p>
<p>text-transform: none
  <strong><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit, ...</span></strong>
</p>

span {
  text-transform: none;
}
strong { float: right; }

This demonstrates no text transformation.

capitalize (General)

<p>Initial String
  <strong>Lorem ipsum dolor sit amet, consectetur adipisicing elit, ...</strong>
</p>
<p>text-transform: capitalize
  <strong><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit, ...</span></strong>
</p>

span {
  text-transform: capitalize;
}
strong { float: right; }

This demonstrates text capitalization.

capitalize (Punctuation)

<p>Initial String
  <strong>(this) “is” [a] –short– -test- «for» *the* _css_ ¿capitalize? ?¡transform!</strong>
</p>
<p>text-transform: capitalize
  <strong><span>(this) “is” [a] –short– -test- «for» *the* _css_ ¿capitalize? ?¡transform!</span></strong>
</p>

span {
  text-transform: capitalize;
}
strong { float: right; }

This demostrates how initial punctuations of a word are ignored. The keyword target the first letter, that is the first Unicode character part of the Letter or Number general category.

capitalize (Symbols)

<p>Initial String
  <strong>ⓐⓑⓒ (ⓓⓔⓕ) —ⓖⓗⓘ— ⓙkl</strong>
</p>
<p>text-transform: capitalize
  <strong><span>ⓐⓑⓒ (ⓓⓔⓕ) —ⓖⓗⓘ— ⓙkl</span></strong>
</p>

span {
  text-transform: capitalize;
}
strong { float: right; }

This demonstrates how initial symbols are ignored. The keyword target the first letter, that is the first Unicode character part of the Letter or Number general category.

capitalize (Dutch ij digraph)

<p>Initial String
  <strong lang="nl">The Dutch word: "ijsland" starts with a digraph.</strong>
</p>
<p>text-transform: capitalize
  <strong><span lang="nl">The Dutch word: "ijsland" starts with a digraph.</span></strong>
</p>

span {
  text-transform: capitalize;
}
strong { float: right; }

This demonstrates how the Dutch ij digraph must be handled like one single letter.

uppercase (General)

<p>Initial String
  <strong>Lorem ipsum dolor sit amet, consectetur adipisicing elit, ...</strong>
</p>
<p>text-transform: uppercase
  <strong><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit, ...</span></strong>
</p>

span {
  text-transform: uppercase;
}
strong { float: right; }

This demonstrates transforming the text to uppercase.

uppercase (Greek Vowels)

<p>Initial String
  <strong>Θα πάμε στο "Θεϊκό φαΐ" ή στη "Νεράιδα"</strong>
</p>
<p>text-transform: uppercase
  <strong><span>Θα πάμε στο "Θεϊκό φαΐ" ή στη "Νεράιδα"</span></strong>
</p>

span {
  text-transform: uppercase;
}
strong { float: right; }

This demonstrates how Greek vowels except disjunctive eta should have no accent, and the accent on the first vowel of a vowel pair becomes a diaeresis on the second vowel.

lowercase (General)

<p>Initial String
  <strong>Lorem ipsum dolor sit amet, consectetur adipisicing elit, ...</strong>
</p>
<p>text-transform: lowercase
  <strong><span>Lorem ipsum dolor sit amet, consectetur adipisicing elit, ...</span></strong>
</p>

span {
  text-transform: lowercase;
}
strong { float: right; }

This demonstrates transforming the text to lowercase.

lowercase (Greek Σ)

<p>Initial String
  <strong>Σ IS A greek LETTER that appears SEVERAL TIMES IN ΟΔΥΣΣΕΥΣ.</strong>
</p>
<p>text-transform: lowercase
  <strong><span>Σ IS A greek LETTER that appears SEVERAL TIMES IN ΟΔΥΣΣΕΥΣ.</span></strong>
</p>

span {
  text-transform: lowercase;
}
strong { float: right; }

This demonstrates how the Greek character sigma (Σ) is transformed into the regular lowercase sigma (σ) or the word-final variant (ς), according the context.

lowercase (Lithuanian)

<p>Initial String
  <strong>Ĩ is a Lithuanian LETTER as is J́</strong>
</p>
<p>text-transform: lowercase
  <strong><span lang="lt">Ĩ is a Lithuanian LETTER as is J́</span></strong>
</p>

span {
  text-transform: lowercase;
}
strong { float: right; }

This demonstrates how the Lithuanian letters Ĩ and J́ retain their dot when transformed to lowercase.

full-width (General)

<p>Initial String
  <strong>0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&()*+,-./:;<=>?@{|}~</strong>
</p>
<p>text-transform: full-width
  <strong><span>0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&()*+,-./:;<=>?@{|}~</span></strong>
</p>

span {
  text-transform: full-width;
}
strong { width: 100%; float: right; }

Some characters exists in two formats, normal width and a full-width, with different Unicode code points. The full-width version is used to mix them smoothly with Asian ideographic characters.

full-width (Japanese half-width katakana)

<p>Initial String
  <strong>ｳｪﾌﾞﾌﾟﾛｸﾞﾗﾐﾝｸﾞの勉強</strong>
</p>
<p>text-transform: full-width
  <strong><span>ｳｪﾌﾞﾌﾟﾛｸﾞﾗﾐﾝｸﾞの勉強</span></strong>
</p>

span {
  text-transform: full-width;
}
strong { width: 100%; float: right; }

The Japanese half-width katakana was used to represent katakana in 8-bit character codes. Unlike regular (full-width) katakana characters, a letter with dakuten (voiced sound mark) is represented as two code points, the body of letter and dakuten. The full-width combines these into a single code point when converting these characters into full-width.

full-size-kana

<p>ァィゥェ ォヵㇰヶ ㇱㇲッㇳ ㇴㇵㇶㇷ ㇸㇹㇺャ ュョㇻㇼ ㇽㇾㇿヮ</p>
<p>ァィゥェ ォヵㇰヶ ㇱㇲッㇳ ㇴㇵㇶㇷ ㇸㇹㇺャ ュョㇻㇼ ㇽㇾㇿヮ</p>
</p>

p:nth-of-type(2) {
  text-transform: full-size-kana;
}

Specifications

Specification	Status	Comment
CSS Text Module Level 3 The definition of 'text-transform' in that specification.	Working Draft	From CSS Level 2 (Revision 1) The definition of 'text-transform' in that specification., extends letters to any Unicode character in the Number or Letter general category. Modifies the behavior of capitalize to apply to the first letter of the word, ignoring initial punctuations or symbols. Adds the full-width and full-size-kana keywords.
CSS Level 2 (Revision 1) The definition of 'text-transform' in that specification.	Recommendation	From CSS Level 1 The definition of 'text-transform' in that specification., extends letters to non-latin bi-cameral scripts
CSS Level 1 The definition of 'text-transform' in that specification.	Recommendation	Initial definition

Browser compatibility

BCD tables only load in the browser

See also

• font-variant