| 词条 | Zero-width space |
| 释义 |
The zero-width space (ZWSP) is a non-printing character used in computerized typesetting to indicate word boundaries to text processing systems when using scripts that do not use explicit spacing, or after characters (such as the slash) that are not followed by a visible space but after which there may nevertheless be a line break. Normally, it is not a visible separation, but it may expand in passages that are fully justified.[1] UsageIn HTML pages, the zero-width space can be used as a potential line-break in long words as an alternative to the To show the effect of the zero-width space, the following words have been separated with zero-width spaces:
And the following words are not separated with these spaces:
On browsers supporting zero-width spaces, resizing the window will re-break the first text only at word boundaries, while the second text will not be broken at all. Blacklisting in URLsICANN rules prohibit domain names from including non-displayed characters such as zero-width space, and most browsers blacklist their use within domain names, because they can be used to create a homograph attack, where a malicious URL is visually indistinguishable from a legitimate one.[3][4]EncodingThe zero-width space character is encoded in Unicode as {{Unichar|200B|ZERO WIDTH SPACE|html=8203}}.[5] The TeX representation is Its semantics and HTML implementation are similar to the soft hyphen. See also
ReferencesCitations1. ^[https://www.unicode.org/versions/Unicode6.1.0/ The Unicode Standard 6.1], p. 366 2. ^{{cite web|url=http://dunae.ca/2009/better-web-typography-with-spaces-and-hyphens/ |title=Alex Dunae » Better Web Typography with Spaces and Hyphens |accessdate=December 3, 2009 |deadurl=unfit |archiveurl=https://web.archive.org/web/20101214223741/http://dunae.ca/2009/better-web-typography-with-spaces-and-hyphens/ |archivedate=December 14, 2010 }} 3. ^{{cite web| title=Network.IDN.blacklist_chars - mozillaZine| url=http://kb.mozillazine.org/Network.IDN.blacklist_chars| accessdate=2018-02-07}} 4. ^{{cite web| title=Unicode Character 'ZERO WIDTH SPACE' - FileFormat.Info| url=https://www.fileformat.info/info/unicode/char/200b/index.htm| accessdate=2018-02-07}} 5. ^{{cite web| title=General Punctuation – Unicode| url=https://www.unicode.org/charts/PDF/U2000.pdf| accessdate=2013-07-20}} 6. ^{{cite web| title=The LaTeX Companion. Chapter 3: Basic Formatting Tools| url=http://latex-project.org/guides/tlc2-ch3.pdf| accessdate=2014-02-08}} 7. ^{{cite web| title=groff(7) – Linux manual page| url=http://man7.org/linux/man-pages/man7/groff.7.html| accessdate=2014-02-08}} Sources{{refbegin}}
4 : Control characters|Typography|Unicode formatting code points|Whitespace |
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