Editing Unicode (section)

=== Web ===
{{Main|Unicode and HTML}}

All [[W3C]] recommendations have used Unicode as their ''document character set'' since HTML 4.0. [[Web browser]]s have supported Unicode, especially UTF-8, for many years. There used to be display problems resulting primarily from [[typeface|font]] related issues; e.g. v6 and older of Microsoft [[Internet Explorer]] did not render many code points unless explicitly told to use a font that contains them.<ref>{{Cite web
 | last          = Wood
 | first         = Alan
 | title         = Setting up Windows Internet Explorer 5, 5.5 and 6 for Multilingual and Unicode Support: ''Options for enabling Unicode in Internet Explorer 5, 5.5 and 6: Fonts (IE 5, 5.5 and 6)''
 | url           = https://www.alanwood.net/unicode/explorer.html#ie5
 | publisher     = Alan Wood
 | date          = 2005-09-13
 | access-date   = 2025-04-12
 | archive-url   = https://web.archive.org/web/20250120141644/https://www.alanwood.net/unicode/explorer.html#ie5
 | archive-date  = 2025-01-20
 | url-status    = live
}}</ref>

Although syntax rules may affect the order in which characters are allowed to appear, [[XML]] (including [[XHTML]]) documents, by definition,<ref>{{Cite web
 | title         = Extensible Markup Language (XML) 1.1 (Second Edition)
 | url           = https://www.w3.org/TR/xml11
 | publisher     = [[World Wide Web Consortium]]
 | date          = 2006-09-29
 | access-date   = 2025-04-12
 | archive-url   = https://web.archive.org/web/20250405204806/https://www.w3.org/TR/xml11/
 | archive-date  = 2025-04-05
 | url-status    = live
}}</ref> comprise characters from most of the Unicode code points, with the exception of:

* FFFE or FFFF.
* most of the [[C0 and C1 control codes|C0 control codes]],
* the permanently unassigned code points D800–DFFF,

HTML characters manifest either directly as [[byte]]s according to the document's encoding, if the encoding supports them, or users may write them as numeric character references based on the character's Unicode code point. For example, the references <code>&amp;#916;</code>, <code>&amp;#1049;</code>, <code>&amp;#1511;</code>, <code>&amp;#1605;</code>, <code>&amp;#3671;</code>, <code>&amp;#12354;</code>, <code>&amp;#21494;</code>, <code>&amp;#33865;</code>, and <code>&amp;#47568;</code> (or the same numeric values expressed in hexadecimal, with <code>&amp;#x</code> as the prefix) should display on all browsers as Δ, Й, ק ,م, ๗, あ, 叶, 葉, and 말.

When specifying [[Uniform Resource Identifier|URIs]], for example as [[URL]]s in [[HTTP]] requests, non-ASCII characters must be [[percent encoding|percent-encoded]].