html tag escape

HTML tag escaping refers to converting special characters in HTML code into normal characters that the computer can recognize. This is done to prevent some symbols appearing in the code from being parsed as HTML tags by the browser and causing unexpected effects, thereby ensuring the normal display of the web page.

Common characters that need to be escaped include <,>,&,", etc. For example, when the < symbol is used in an HTML document, the browser may mistakenly think that it is an HTML tag. start, causing display problems. Therefore, the < symbol needs to be escaped to <.

The following are some common methods of escaping HTML markup characters:

<: escape meaning >: escaping >symbol
&: escaping &symbol
": escaping 'symbol
': escaping 'symbol

To avoid Special characters are accidentally escaped. It is recommended to always use character entity names to replace characters when writing HTML code. For example, use " instead of " symbol, < instead of < symbol, etc.

Except in HTML code The entity name is used in the entity name, and the entity number can also be used. The entity number is some specific integer value, corresponding to the character entity name, for example:

&: corresponds to &
<: corresponds to <
> :Corresponding>

Although both entity numbers and entity names can escape special characters, entity names are more commonly used because they are easier to remember and understand.

Escaping HTML tags You need to be extra careful when escaping incorrectly, because incorrect escaping may cause the HTML page to not be displayed correctly. For example, if you accidentally escape the

tag to

, then the tag will lose the meaning it should have, thus Causes problems on the page.

In the process of website development and maintenance, HTML tag escaping is a very basic but very important concept. Following the standard HTML tag escaping rules can avoid many code errors. display problems and improve website quality and user experience.

The above is the detailed content of html tag escape. For more information, please follow other related articles on the PHP Chinese website!

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