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ISO 639est le code de langue établi par l'Organisation internationale de normalisation pour chaque langue. ISO 639Le titre est Codes for the representation of names of languages (codes pour la représentation des noms des langues), divisé en six parties.
Le attribut lang de HTML peut être utilisé pour déclarer la langue d'une page web ou d'une partie de la page web. Cela est utile pour les moteurs de recherche et les navigateurs.
Selon W3C Recommandation standard, vous devriez déclarer la langue principale de chaque page à l'aide de l'attribut lang du tag <html>, par exemple :
<html lang="en">
...
</html>
在 XHTML 中，采用如下方式在 <html> 标签中对语言进行声明：
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
...
</html>
ISO 639-1 为各种语言定义了缩略词。您可以在 HTML 和 XHTML 中的 lang 和 xml:lang 属性中使用它们。
| 语言 | ISO 代码 |
|---|---|
| Abkhazian | ab |
| Afar | aa |
| Afrikaans | af |
| Albanian | sq |
| Amharic | am |
| Arabic | ar |
| Aragonese | an |
| Armenian | hy |
| Assamese | as |
| Aymara | ay |
| Azerbaijani | az |
| Bashkir | ba |
| Basque | eu |
| Bengali (Bangla) | bn |
| Bhutani | dz |
| Bihari | bh |
| Bislama | bi |
| Breton | br |
| Bulgarian | bg |
| Burmese | my |
| Byelorussian (Belarusian) | be |
| Cambodian | km |
| Catalan | ca |
| Cherokee | |
| Chewa | |
| Chinese (简体) | zh |
| Chinese (繁体) | zh |
| Corsican | co |
| Croatian | hr |
| Czech | cs |
| Danish | da |
| Divehi | |
| Dutch | nl |
| Edo | |
| English | en |
| Esperanto | eo |
| Estonian | et |
| Faeroese | fo |
| Farsi | fa |
| Fiji | fj |
| Finnish | fi |
| Flemish | |
| French | fr |
| Frisian | fy |
| Fulfulde | |
| Galician | gl |
| Gaelic (Scottish) | gd |
| Gaelic (Manx) | gv |
| Georgian | ka |
| German | de |
| Greek | el |
| Greenlandic | kl |
| Guarani | gn |
| Gujarati | gu |
| Haitian Creole | ht |
| Hausa | ha |
| Hawaiian | |
| Hebrew | he, iw |
| Hindi | hi |
| Hungarian | hu |
| Ibibio | |
| Icelandic | is |
| Ido | io |
| Igbo | |
| Indonesian | id, in |
| Interlingua | ia |
| Interlingue | ie |
| Inuktitut | iu |
| Inupiak | ik |
| Irish | ga |
| Italian | it |
| Japanese | ja |
| Javanese | jv |
| Kannada | kn |
| Kanuri | |
| Kashmiri | ks |
| Kazakh | kk |
| Kinyarwanda (Ruanda) | rw |
| Kirghiz | ky |
| Kirundi (Rundi) | rn |
| Konkani | |
| Korean | ko |
| Kurdish | ku |
| Laothian | lo |
| Latin | la |
| Latvian (Lettish) | lv |
| Limburgish ( Limburger) | li |
| Lingala | ln |
| Lithuanian | lt |
| Macedonian | mk |
| Malagasy | mg |
| Malay | ms |
| Malayalam | ml |
| Maltese | mt |
| Maori | mi |
| Marathi | mr |
| Moldavian | mo |
| Mongolian | mn |
| Nauru | na |
| Nepali | ne |
| Norwegian | no |
| Occitan | oc |
| Oriya | or |
| Oromo (Afaan Oromo) | om |
| Papiamentu | |
| Pashto (Pushto) | ps |
| Polish | pl |
| Portuguese | pt |
| Punjabi | pa |
| Quechua | qu |
| Rhaeto-Romance | rm |
| Romanian | ro |
| Russian | ru |
| Sami (Lappish) | |
| Samoan | sm |
| Sangro | sg |
| Sanskrit | sa |
| Serbian | sr |
| Serbo-Croatian | sh |
| Sesotho | st |
| Setswana | tn |
| Shona | sn |
| Sichuan Yi | ii |
| Sindhi | sd |
| Singhalese | si |
| Swati | ss |
| Slovaque | sk |
| Slovène | sl |
| Somalien | so |
| Espagnol | es |
| Sundanais | su |
| Swahili (Kiswahili) | sw |
| Suédois | sv |
| Syriaque | |
| Tagalog | tl |
| Tadjik | tg |
| Tamazight | |
| Tamoul | ta |
| Tatar | tt |
| Télougou | te |
| Thaï | th |
| Tibétain | bo |
| Tigrigna | ti |
| Tonga | to |
| Tsonga | ts |
| Turc | tr |
| Turkmène | tk |
| Twi | tw |
| Ougouren | ug |
| Ukrainien | uk |
| Urdu | ur |
| Ouzbek | uz |
| Venda | |
| Vietnamien | vi |
| Volapük | vo |
| Wallon | wa |
| Welsh | cy |
| Wolof | wo |
| Xhosa | xh |
| Yi | |
| Yiddish | yi, ji |
| Yoruba | yo |
| Zulu | zu |