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& is the way to represent an ampersand in most sections of an XML document. If you want to have XML displayed within HTML, you need to first create properly encoded XML (which involves changing & to &) and then use that to create properly encoded HTML (which involves again changing & to &). That results in: &
So an actual & got an & escape sequence to render an actual & because early parsers couldn't know if the & was the start of an escape sequence or just a literal &. There are many, many more. So when automated escapers and descapers do their thing with inputs and outputs, they sometimes screw up and will escape **&**amp; as **&**amp ...
& ampersand & < less than sign < > greater than sign > " the double quote sign " Appendix II lists a broad range of characters and symbols, relating their ISO names to the corresponding character codes in common character sets. They allow authors to include accented characters in 7-bit ASCII documents.
decoding: & -> & So what could happen is "Write some text -> HTML encode -> put in database -> HTML encode again-> retrieve and display the text on page" - it could also happen if the text your were trying to put in the database was already HTML encoded to begin with.
一、概述 在 HTML 中，某些字符是预留的。在 HTML 中不能使用小于号（<）和大于号（>），这是因为浏览器会误认为它们是标签。如果希望正确地显示预留字符，我们必须在 HTML 源代码中使用字符实体（character entities）。字符实体类似如下： &entity_name; 或者 &#entity_number; 如需显示小于号 ...
It may have converted a character twice. & -> & -> & When the browser receives the string "&", it performs the task of restoring the complete "entity" in the first 5 characters, resulting in "&" being output. Other possibilities is the encoding of the ampersand using a numerical character code, or omission of the semicolon.
If you want one to appear in text on a web page you should use the encoded named entity "&"—more technical mumbo-jumbo at w3c.org. While most web browsers will let you get away without encoding them, stuff can get dicey in weird edge cases and fail completely in XML.
A set of general entities (amp, lt, gt, apos, quot) is specified for this purpose. Numeric character references may also be used; they are expanded immediately when recognized and must be treated as character data, so the numeric character references " < " and " & " may be used to escape < and & when they occur in character data.]
Ampersands are escaped like & which displays correctly as: Ampersands are escaped like & In many languages, the backslash is an escape character. Then, the literal string C:\projects will have to be escaped as C:\\projects.
With the exception of HTML 2.0's ", &, <, and >, these entities are all new in HTML 4.0 and may not be supported by old browsers. Support in recent browsers is good. Support in recent browsers is good.